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 "" representing the decimal value of each of the four bytes. Valid addresses thus range from to, 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, 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.

Blacklist-IP.Com offers service to trace your IP addresses.

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