Class C IP Checker

Enter up to 40 Domains (Each Domain must be on separate line)

About Class C IP Checker

An IP address is a numerical representation that uniquely identifies a specific interface on the network. These numerical identifier numbers are assigned to every device or domain that connects to the Internet. IP addresses are normally expressed in numerical-decimal format, with four numbers separated by periods, such as Through DNS resolvers, which translate human-readable domains into IP addresses, web users are able to access websites without memorizing this complex series of numbers.

IP addresses are binary numbers but are normally expressed in decimal form (IPv4) or hexadecimal form (IPv6) to make reading and using them easier for online users. Addresses in IPv4 are 32-bits long. This allows for a maximum of 4,294,967,296 (232) unique addresses. Addresses in IPv6 are 128-bits, which allows for 3.4 x 1038 (2128) unique addresses.

The total usable address pool of both versions is reduced by various reserved addresses and other considerations.

Internet Addresses Network Classes

IP addresses are allocated by the InterNIC and are divided into 5 classes. There are classes A, B, C, D and E. The claases A, B and C are the most common and are reserved for end users. Classes D and E are not reserved for end users. Each of the address classes has a different default subnet mask. You can identify the class of an IP address by looking at its first octet. Following are the ranges of Class A, B, and C Internet addresses, each with an example address:

Class A IP addresses use a default subnet mask of and have 0-127 as their first octet. For example, the IP address is a class A address. Its first octet is 16, which is between 1 and 126, inclusive.

Class B IP addresses use a default subnet mask of and have 128-191 as their first octet. The address is a class B address. Its first octet is 172, which is between 128 and 191, inclusive.

Class C IP addresses use a default subnet mask of and have 192-223 as their first octet. The address is a class C address. Its first octet is 192, which is between 192 and 223, inclusive.

In all of these, Class C" IPv4 addresses are used for small-sized networks and represents almost 12.5% of the Original IP Space.

Class C Public & Private IP Address Range

As said before, Class C addresses are used in small local area networks (LANs). You can easily identify a Class C IP address by looking at it's first octet. If the first 3 bits or first octet is between (and including) 192 and 223, it is a Class C IP address.

The default structure of a Class C IP address is Network.Network.Networkt.Host, so the default subnet mask is

A very important IP address reservation in the Class C IPv4 addresses is private networks ( to Networks belongs to "Class C" from to are reserved for private use and can be used inside any organization. Computers that are not connected directly to the Internet need an IPv4 addresses unique to that network only and do not need globally-unique IPv4 addresses. Private IP addresses are used for that purpose.

What is the SEO Impact of Your Site’s IP Address?

We've heard Google talk about Class C Ip addresses from the stance of a penalty and that generally you don't need to worry being on the same Class C IP address as a spammy website. But oftentimes, you can get in trouble if you are one out of 5,000 websites on a spammy Class C IP addresses.

If your website is on a shared server that is 99.8% porn, black hat websites and spammers, it would just be difficult for Google to ignore the 0.02%. They probably will blacklist the whole server with that Class C subnet or IP address because nothing good is coming from out of there.

So one of the ways Class C IP addresses are useful is to locate every scammy, porn or spammy websites and change your website host.

Another way getting to know Class C IP addresses of website is to find links from different same C class IP addresses. The search engines will give significantly more link power love if your inbound links are on different c class ip addresses. You can check all the backlinks coming from the same C class IP with a Class C IP address checker. This feature can be very useful in many situations:

  • Find all the links coming from websites which have the same hosting server and IP address range.
  • Find the links coming from a particular link network
  • Identify all the links coming from the same hosting and IP
  • Confirm if you have website-wide links.

It is important to having a number of links from different Class C IP address because If your site has too many links coming from the same Class C IP address, it can lead to suspicion by Google that you are doing something not ethical SEO-wise. Research has shown that separate C-Class IP links can have a huge impact in your SEO rankings. If a site owner has two website, then its important for the websites to have two unrelated IP addresses. If not, Google might find these websites as suspicious if it has the same keyword structures.

How to Check Class C IP Address of a Domain or Website

To check for class C IP address of any website or domain, check out Class C IP Checker Tool from Class C Ip Checker is a free SEO tool that allows you to cross-check several websites and find out if they are listed on the same Class C IP. The Class C Ip Checker is part of our robust 100% free online SEO tools.

All you need to do is follow the steps below for a quick check:

1. Visit and go to the Web Page Size Checker Tool Page.
2. Enter the URL of your website address in the search field and press the Check button.
3. SEOCentralTools will show you your web page size and the load times.

This is what you will see if the website is up:



This is the result of the check.



You can Enter up to 40 Domains (Each Domain must be on separate line. That is how to get the class C Ip address of any website.


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