A reverse DNS (domain name server) search is similar to a reverse phone search in that it is designed to find information linked to a group of numbers. However, unlike a reverse phone lookup that searches a telephone number, a reveres DNS lookup conducts a search with an IP address.

An IP (internet protocol) address is a computer's numeric address (I.E. 1.127.240.18) that is converted into a domain name (I.E. Google.com) by a domain name server. Every server that is connected to the internet is given a unique IP address. Therefore, a reverse DNS search queries domain name servers in an attempt to discover a match.

Why is a reverse DNS search used? A reverse DNS lookup can be utilized for a number of reasons, but the most common reasons are:

o Network troubleshooting assistance - Reverse DNS search was very useful for SMTP e-mail, and website tools used to track users, for instance, in the case of internet forums. Essentially, reverse domain name searches provided assistance in the same manner that tracerouting and pinging is helpful in regards to network support.

o Anti-spam - This service is often used by individuals to check up on the domain name of a certain sender of spam emails, so that it can be determined whether the spammer is likely connected to dialup customers, home-based broadband customers, or if the individual has dynamically assigned addresses. Many, but not all, spam emails start off from servers that have missing "generic" reverse domain name server lookup names.

o Verifying the Forward Confirmed reverse DNS (FCrDNS) format - This verification in FCrDNS format permits a style of authentication that is connected between the server owner, IP address provider, and the domain name owner. Even though this technique is not completely thorough, it is accurate enough in validation that it is often utilized for white-listing, as a lot of spammers and phishers use "zombie computers" that cannot escape this type of a test.

Thus, if you would like to match an IP address with a domain name server, all you will require is the IP address, which you will enter into the search box provided on a reverse DNS search site.

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Recently, technology has advanced to create a Reverse IP Lookup(IP Neighbor).

Reverse IP Lookup(IP Neighbor) is free reverse IP tool allows you to use an IP address to identify all the domains hosted on a server. That means, by using the Reverse IP Lookup, you can identify all the .com, .net, .org, .biz, .us, and .info websites hosted on a given IP address. All you need to do is enter the IP address or Domain name into our IP neighbor tool and it will give you a list of all the domains hosted on it.

If you are the owner of a website or blog, you may want to keep track of your visitors, so that you can find out the reach of your website. Otherwise you may simply want to know who sent an anonymous email message to you, and hence you may often have wondered if there is any way to find out more about a person using only their IP address. There is a way to get some such information using a process known as Reverse IP Lookup.

 

 

In order to perform a Reverse IP Lookup, you first need to obtain the IP address of the person you want to trace. The IP address or the Internet Protocol address is usually a twelve digit number, unique to every computer connected to the internet. When you connect to the internet, your Internet Service Provider assigns a number to your computer, which acts as your universal address on the internet.

So, how do you find a person's IP address? If you own a website or blog, then your server will usually have a log file containing a list of all visitors to your website. This log will have the person's IP address recorded in it.

If you want to find the IP address of a person who sent you a mail, then you will need the full headers of the email message. Usually, there will be a button on the mail page which says "View Full Headers" or something similar to that. Clicking this button displays a large amount of extra information near the subject line of the email. The IP address of the sender will also be listed here.

 

So now that you have the IP address, what's next? You will have to visit a site which offers IP lookup services such as http://www.blacklist-ip.com. There are a lot of free IP lookup services on the internet. Once you find a website of your choice, enter the IP address into the site, and it will perform a lookup. Once it is done, the results are displayed to you.

So now that you know how to perform a reverse IP lookup, can you find the address of the person who's been spamming you all week? No, you can't. Though some useful information can be obtained by doing a reverse IP lookup, there are some pieces of information that cannot be found using a reverse IP lookup. The name and address of the person are some of the information which cannot be obtained (unless you belong to a law enforcement agency that is).

Though you cannot obtain the name and address of the person, you can obtain some moderately useful information from a reverse IP lookup. Most sites offer various details about the IP address such as Internet Service Provider name, location, the time zone of the person, the international phone code. You can also obtain the state in which the person resides as well as a satellite map of the location.

Thus a reverse IP lookup yields a lot of useful information, which can be used to enhance the reach of your website or blog, or simply assist in helping pin down a spammer.

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A spam filter is a piece of software that scans through a message to determine if it is spam or not. Most spam filters work in a very similar way, using a set of rules to try and work out what the message is about and whom it is from. Some are more successful than others.

Types of SPAM Filters :

1. Rules-Based / Bayesian Analysis
2. Content Based
3. White List and Black List
4. Challenge/Response
5. Community-Based

1. Rules-Based / Bayesian Analysis

Rules based systems are the original spam filters. They started life by simply looking for key words or phrases in the message and block based when matches were found. Simple rules based spam blockers are very poor at filtering out spam. They will often block a legitimate message and also let through a good percentage of the actual spam.

A Rules-based spam filter allows the user to determine which email is junk mail and sorts accordingly.

Bayesian Analysis is a relatively new method of filtering spam e-mail. It uses mathematical formulae to analyse the content of a message, learning from the user which is a valid message and which is spam.
A Bayesian spam filter relies on two things to work effectively:

1. How well the Bayesian analysis formulae has been implemented
2. How good a sample of data it has to work with

2. Content Based


Content-based filters block certain words or phrases of incoming mail.

3. White List and Black List


These are very basic types of filters which nowadays are rarely used on their own, but are still used as part of an integrated filtering system comprising some of the other methods shown here.

Whitelist filters will not accept e-mail from any address unless it is on a list of known "good" e-mail addresses.

Blacklist filters, conversely, will allow messages from any address unless the address is on a list of known "bad" sources.

White Lists and Black Lists filter your email either by names in your address book as approved senders, or by blocking known spammers based on a blacklist.


4. Challenge/Response

Challenge/Response filters are characterised by their ability to automatically send a response to an unknown sender asking them to take some further action to ensure their message will be received. This is often referred to as a "Turing Test" - named after a test devised by British mathematician Alan Turing to determine if machines could think.

Challenge/Response filters monitor mail by requiring unknown senders to respond with a security code before allowing their email.

Recent years have seen the appearance of some internet services which automatically perform this Challenge/Response function for the user and require the sender of an e-mail to visit their web site to facilitate the receipt of their message.




5. Community-Based

These types of filters work on the principal of "communal knowledge" of spam. These types of filters communicate with a central server. When a user receives a message that is spam, they simply mark it as such. This information is posted to the central server where a "fingerprint" of the message is added to the database. When enough people have "voted" the message as spam, it will be blocked from user's inboxes in the future.

Community Based anti-spam filters are based on a community of users that report known spammers. Some of the popular email programs use this type of filter. According to Consumersearch.com, this may be a sufficient enough spam filter.


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The IP Address and Classes

IP addressing is based on the concept of hosts and networks. A host is essentially anything on the network that is capable of receiving and transmitting IP packets on the network, such as a workstation or a router. It is not to be confused with a server: servers and client workstations are all IP hosts.

The hosts are connected together by one or more networks. The IP address of any host consists of its network address plus its own host address on the network. IP addressing, unlike, say, IPX addressing, uses one address containing both network and host address. How much of the address is used for the network portion and how much for the host portion varies from network to network.
IP addressing

An IP address is 32 bits wide, and as discussed, it is composed of two parts: the network number, and the host number [1, 2, 3]. By convention, it is expressed as four decimal numbers separated by periods, such as "200.1.2.3" representing the decimal value of each of the four bytes. Valid addresses thus range from 0.0.0.0 to 255.255.255.255, a total of about 4.3 billion addresses. The first few bits of the address indicate the Class that the address belongs to:

The bits are labeled in network order, so that the first bit is bit 0 and the last is bit 31, reading from left to right. Class D addresses are multicast, and Class E are reserved. The range of network numbers and host numbers may then be derived:

Any address starting with 127 is a loop back address and should never be used for addressing outside the host. A host number of all binary 1's indicates a directed broadcast over the specific network. For example, 200.1.2.255 would indicate a broadcast over the 200.1.2 network. If the host number is 0, it indicates "this host". If the network number is 0, it indicates "this network" [2]. All the reserved bits and reserved addresses severely reduce the available IP addresses from the 4.3 billion theoretical maximum. Most users connected to the Internet will be assigned addresses within Class C, as space is becoming very limited. This is the primary reason for the development of IPv6, which will have 128 bits of address space.

Importance of C class IP in SEO?

Search engines don't prefer back links from the same IP addresses .Many new smaller novice hosts firms only mange one single or very few C-classes and therefore makes it difficult to get multiple IPs in different C-classes if you host all your sites the same place. Larger hosts have many C-classes (I believe some even have almost full B-classes but unless you specifically request your various sites to be on different C-class IPs you still could end up on the same. It's usually not something hosts care about (in relation to SEO and linking).Many webmasters started creating hundreds of website on same server and linked each other to increase the sites backlink and google page ranking.

Latest Search Engines like google identified this issue and started avoiding links coming from similar IPs - given its easy to get different D class ips on same server, Search Engines also started avoiding Links from same C Class IP. So whenever any good search engine see that you’ve a link coming from same C Class IP on which your website is located, the backlink will not have any importance oe little importance. Keep in mind that you’ll not get penalized if you’ve link coming from same C class IP, but you’ll not get any advantage either.

But Search Engine filters penalize your website if they are:

- Hosting websites on I.P addresses in the same C Class
- Similar nameservers for websites
- Similar WhoIs information for websites
- Similar rDNS domain for websites

So if you are doing the link exchange specially if you don’t have your own server, do check if the person you are linking to has a different C class ip than yours.Multiple C Class IP hosting gives a better back linking solution.

SEO Hosting a new idea ; is all about providing different class C IP address and enable webmasters to host their websites and blogs from separate nameserver on separate class C IP addresses. Multiple class C IPs can really push SEO score of a website to a large extent. Class C IP technique works great enough that there is no scope of its failure.



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The most common method to hide your IP address is to use a proxy server in one form or another. A proxy server is a computer that offers a computer network service to allow clients to make indirect network connections to other network services. A client connects to the proxy server and then requests a connection, file, or other resource available on a different server. The proxy provides the resource either by connecting to the specified server or by serving it from a cache. In some cases, the proxy may alter the client's request or the server's response for various purposes.

There are several implementations of proxy servers that you can use to hide your IP address (in an attempt to remain anonymous on the internet):

Website Based Proxy Servers

A Website based proxy server is a website that provides a form for you to enter the URL of a website that you wish to anonymously visit. When you submit the form the website proxy server makes a request for the page that you want to visit.

The machine usually does not identify itself as a proxy server and does not pass along your IP address in the request for the page. The features of these sites vary (ad blocking, javascript blocking, etc) as does their price. Some are free and some charge. Examples of website proxy services are:

• Proxify.com

Installed Software Proxy Servers

There are a variety of companies and software packages available at either a onetime cost or at an annual subscription. These are usually faster and more reliable than the above proxy servers.

• Browser Configured Proxy Servers

There are also stand alone proxy servers that allow for you to configure your browser to route your browser traffic through that machine, which then makes a request for a page on your behalf, and then sends you the results. These are usually used at no cost to the user. Since they are accessible to the public these are often quite slow. Please see instructions for using a proxy server.

There are a variety of types of these proxy servers:
• Transparent Proxy

This type of proxy server identifies itself as a proxy server and also makes the original IP address available through the http headers. These are generally used for their ability to cache websites and do not effectively provide any anonymity to those who use them. However, the use of a transparent proxy will get you around simple IP bans. They are transparent in the terms that your IP address is exposed, not transparent in the terms that you do not know that you are using it (your system is not specifically configured to use it.) This type of proxy server does not hide your IP address.

• Anonymous Proxy

This type of proxy server identifies itself as a proxy server, but does not make the original IP address available. This type of proxy server is detectable, but provides reasonable anonymity for most users. This type of proxy server will hide your IP address.

• Distorting Proxy

This type of proxy server identifies itself as a proxy server, but make an incorrect original IP address available through the http headers. This type of proxy server will hide your IP address.

• High Anonymity Proxy

This type of proxy server does not identify itself as a proxy server and does not make available the original IP address. This type of proxy server will hide your IP address.

VPN Services

A virtual private network (VPN) protects your data and identity over public networks, like the Internet and wireless hotspots. Various protocols are used to create an encrypted tunnel that transports data securely. While a firewall may protect the data on your computer, a VPN will protect your data on the Internet.

The goal of a VPN is to implement the same level of security provided by private networks at substantially lower costs. VPN services provide different gateway cities where the IP address assigned to your computer is located. This allows users to access websites only available to users from a certain country. This application is particularly important for travelers who need to access websites from their home country and for people living in regions rife with censorship, like China and Iran.
• VyprVPN

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Nowadays, E-mail has revolutionized the way we communicate. In just a short amount of time, it has become a resource that most of us feel we would be hard-pressed to live without.

But for all its promise and convenience, e-mail comes with a downside - spam.

Unsolicited e-mails carry with them the risk of viruses, scams and potentially hurtful messages.

So how do you go about ridding yourself of these unwanted e-mails and get back to the business of quick, convenient and efficient communication? The most important step may be finding out as much information possible about the person or agency responsible for sending the offending e-mails.

Email Black lists contain known mail servers and addresses used by spammers. With these lists in place, access to the server can be denied and unwanted email messages are discarded. However, your legitimate emails may also be blocked.

In the early days, people were used to submit their email address to email directories. Sites like Bigfoot & Switchboard were very popular.

These days there is no worthwhile, purposeful email directory. Those of the late 90's (ie Bigfoot) still maintain large databases, but the data is very out-of-date.

Certain Web sites offer services that allow you to conduct reverse e-mail searches. You simply type in the e-mail address in question and you can receive information about the sender such as their first and last name, their street address and sometimes even the person's place of work.

Through a reverse email address lookup, you can generally find:

* Owner Name & Address
* Email Address IP
* Owner Photo
* Email Address Validation
* And More!

Having this information empowers you to confront the offending spammer by notifying them that you are aware of who they are, where they are from and perhaps who they work for. This simple revelation may scare the offending party into removing you from their e-mail list in order to avoid being turned into the authorities.

Under federal law, sending spam is illegal. By conducting a reverse e-mail search, you will be providing officials with the necessary information to pursue and eliminate the offending spammers.

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Nowadays Email marketing has become extremely popular. It is a great tool for marketing your products and services in front of a targeted audience. It also serves as a continuous form of dialog between your customer and you by which they are tempted to get back to the website that you want them to.

However, the SMTP Mail Server software may offer some serious challenge while sending emails to your customers. For instance, you discover that your mails are taking too long to be delivered, or in the worst scenario they are not getting delivered at all. If this is the case, you have to understand the mechanism behind this inconvenience. The SMTP Mail Server or the mail transferring agent (MTA) is the main sending engine for your bulk emails. This server decides the domains and the successful delivery for your outgoing mails. Without the help of this server your email will never reach its destination. When this server stops functioning properly, you receive un-delivered messages back to your inbox. Usually, this inconvenience occurs at the time of sending bulk emails.

The root cause for this problem started with the increase in volume of sending emails for various marketing purposes. The problem first manifested in email communications meant for personal usage; they were not designed for handling bulk emails. Also, the inability of the SMTP Mail Server in adapting to the challenges of bulk delivery, made matters worse. These problems and challenges occurred in the form of email bounces, non-delivery of mails to definite domains, and inadequate support for proper email authentication.

There can be many reasons for delivery related problems of your messages. The simple reason behind this problem is the lack of ability on the part of the SMTP Mail Server to take up the load for bulk messages. However, there are also some other complex technical issues behind this problem that needs to be sorted out for maintaining smooth transactions of mails.

The blacklisting of your IP address happens when ISP detects your ID as a spammer. The ISP gives its verdict based on the sending patterns of your mails for a considerable period of time. Blacklist-IP.Com is one of the Best Blacklist IP Monitoring Service Provider and offers a solution those who are related to Internet Networks and having Blacklisted IP address and Blacklist Domain.

As the messaging and communication landscape continues to evolve over the years, new communication channels appear and with them, new threats. What used to be a simple mail server configuration handled by local administrators has become a new industry requiring specific skills and expertise. Spammers are using sophisticated techniques to lure end users. Information theft has turned into a trillion dollar industry and is an issue that still isn’t addressed properly by a majority of organizations focused on protecting their customers’ data before securing their own.

Modern email security solutions help address a lot of these issues but Email and IT administrators are sometimes left in the dark by vendors focused solely on profit and cutting costs in an over-commoditized market. Here our aim is to presenting a few tips and features to use and apply in order to improve the security of businesses’ email communication systems. DNSBLs that list domain names are known as URIBLs, in which the content of the email message is checked for any URL’s registered with a URL database. If the URL of an email message from where the email message has come from including any URL’s within the subject or body are found and the URL exists within a URIBL database, then the email message is classified as spam, or suspected spam. URL databases such as SURBL are a list of website domains that have appeared in spam email messages.

Careful about backup mail servers

Many organisations need to have a backup mail server so that email activities continue to operate properly in the event of a server failure. In order to cut costs, some IT administrators will build a mail infrastructure using a single email security gateway sitting in front of the mail server.

Aware of your users’ white-lists
One of the oldest and most common methods for spammers to get through spam filters is by using the white-listed address spoofing. After entering envelope data properly, the spammer can fake a sender identity using the body of the message.

By using the recipient’s email address as the From address, they are able to get through filters when end-users white-list their own email address. Modern email security solutions will prevent users from white-listing their own email addresses automatically and system-wide but email administrators using older systems should pay attention and inform their end users about this possible backdoor.

Block all EXEs by default
All .exe files should be blocked. And the reason is simple. First, the majority of phishing attempts with drive-by-downloads try to entice end users to download and run .exe files. Second, all malware/viruses/worms are executables and the most common type of executables are .exe files (in a Windows-based environment).

Couple these two facts with Windows’ default permit behavior in terms of security and privileges and these threats get access to the entire computer’s abilities to act as a key logger, a bot, or a disruptive or destructive agent. To add complexity, Windows does not let administrators to easily control and limit execution of programs. Group policies can be used but a lot of software programs expect full control over resources in order to be able to function properly.

In some relatively rare cases, end users need to exchange legit .exe files. When this situation cannot be avoided, IT administrators should add very strict rules to their email security solution, in a highly controlled manner, to authorize specific executables. In the end, it will be a lot faster and easier to manage a list of several dozens authorized executables within a global white-list in the email gateway than complex policies comprising millions of blacklisted malware on a system not optimized or natively designed to handle such permissions.


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If you are using a common IP address on web hosting and this IP is being abused by spammer or computer viral activities, etc. most likely the IP address you are using will be blocked. Your site has contents that are not in favor to the other party and the party will blacklist your IP by blocking it to make it inaccessible.

To overcome the problems of your IP Address being blocked, here is the list of things you can do.

Use a free proxy server. Google "free proxy list" and try your luck. Use free proxy server for low demand browsing because they are over spam by advertisement banners and slow down your browser performance.
Install another computer in another location or country, and then use remote control software to get access to your computer and access the desired site. If you have extra cash, you can install your own VPN server in another location.

Most importantly, do not offer specific contents and keywords on your websites that speak ill or is against the country you have the most viewers from. Doing so will risk your IP being blocked.
Contact your web host and ask if they can re-assign you to another set of IP. If you have budget, you can get your own IP address for your website. Having a dedicated IP address also improve your ranking with search engines.
Use a paid VPN to get access. Most free VPN services use PPTP for communication. A paid VPN service offers you IPSec or SSL increase your chances of reaching the desired site is higher than PPTP.
Use a IP spoof tool to change your IP address. You can google and read more about it?

Call your friends in another location and login and get access on your behalf.


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