C Blocks

[TravG]

So after 5+ years doing this I should probably know the answer to this but if you don't ask you will never know right?

I am trying to learn more about the intricies of links and one report I am looking at is showing the number of linking C blocks. I am assuming this is something to do with servers or something because my number is pretty low. So what exactly are they they speaking of when they say a C Block?

With my websites I have the majority of them listed with one hosting provider but have dedicated IP's with most of them. If C Blocks are kind of what I am thinking of, I am assuming that eventhough I have dedicated IP's they are probably still the same C Block?

Just looking for a little clarification.

Thanks - Travis

[MichaelCorfman]

A 'C" block refers to a block of Internet Protocol addresses. IPv4 (Internet Protocol Version 4) addresses are 32 bits long. When two IPv4 addresses have identical values for the first 24 bits, and only the last eight bits differ, they are considered to be part of the same C block.

If you have dedicated IP addresses on the same server, it is quite likely that they will all be from the same C block of IP addresses.

Michael

[edgarf76]

is having a dedicated IP on the same server the same thing as having a VPN hosting plan? Everytime I call my hosting company they try to get me to upgrade to a VPN hosing plan, they say it gives three unique IP's. Is this the same thing?

[universal4]

3 Unique ips may or may not be in the same class c.

A class C consists of 256 IP's (more commonly referred to as 255)192.168.1.xxx The last octec (las 3 numbers) refer to 0 through 255.

It is very rare that 0 is used (I know some claim they can't be used but it depends on routing) and often the number .1 is not used since this is most commonly the gateway, but the gateway can be a number of other ip's also. The .255 is rarely used since that will be the default broadcast ip.

Edgar, you said thew host was trying to get you to upgrade to a vpn plan, it is most propbably a vps plan (Virtual Private Server) where your server would be a virtual server located on a physical server that likely has a few virtuals on it (or it may exist within a cloud). There is another thread here from recent weeks with more specifics about virtuals.

You will have to ask your host if the ip's they would assign to you are in the same class c or not, this may or may not be a requirement depending on how the host routes their subnets.

Rick
Universal4