Class C Ip Checker

i-SeoTools: Search Engine Optimization

Class C Ip Checker

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

About Class C Ip Checker

Each device that connects to other devices on the Internet is assigned a unique IP address. For systems to find each other on distributed networks like the Internet, each node on the network is assigned a unique address.

This address is commonly known as "IP address" or "IP". An IP address is a 32-bit binary address that consists of two sub-addresses that identify the network and the host of the network. An IP address is made up of four sets of numbers ranging from 0 to 255, separated by (.) In decimal form. For example, is a valid IP address.

There are five classes of IP addresses, which are:

  • Class A

    The first bit of the address class is always set to 0. This only leaves seven bits for the network portion of the address. Class A addresses range from to This means that there can only be 128 network numbers.

  • Class B

    The first bit of a class B address is always set to 1, and the second bit is set to 0. This means 16,384 networks can be assigned a class B address. Numbers in the range -

  • Class C

    Class C addresses have their first two bits set to 1 and the third bit set to 0. This means 2,097,152 networks can be assigned this class of address. Numbers in the range -

  • Class D

    Class D address has its first three bits set to 1 and the fourth bit set to 0. Class D address is used for multicasting applications. Numbers in the range - are reserved for multicast groups.

  • Class E

    Class E addresses are reserved for experimentation and testing and have never been used in any standard form.

Grades A and B are assigned to very large and medium-sized organizations. Class C is the most popular class of addresses assigned to small businesses and is the most commonly used IP address. Small and medium-sized Internet service providers purchase a pool of Class C IP addresses that they assign to their customers. ISPs provide a dynamic (shared) IP address for their customers. The reason for this is that because they are common, they are cheaper and more popular. Second, users who are assigned IP addresses do not use them 24/7. Thus, when a user signs or has no traffic to a site, their IP addresses are assigned to other users and websites.

The pros of class C dynamic IP addresses are that they are cheaper and more real for websites and users who are not active Internet users. If you have five people sharing WiFi in your home, you will be assigned a dynamic address, and when you are not using the Internet, your address will be assigned to another user, just signs. When you use the Internet again, you will be assigned a different IP address. This IP address will be assigned from the available pool of C class IP addresses that your ISP purchased.

As dynamic class C IP addresses are shared among multiple hosts, there is a danger associated with them. If your site has a dynamic C class IP address, it could affect your search engine rankings and your SEO efforts could be wasted. If a website that is sharing the same IP address as yours gets blacklisted, your site may also get blacklisted. This happens when a search engine blacklists a website. It is not a blacklisted website, only its domain name, but its IP address as well. Search engines, when they visit a website, make it an IP address, since the IP address is a unique identifier for the domain. ISPs provide for this possibility, and if a site gets blacklisted, they reassign a new IP address to other sites,

ISPs install firewalls and other necessary applications and hardware to ensure that their hosting service provider's system remains "clean" and not affected by malicious attacks. As hackers and other malicious people are constantly busy trying to hack into websites and damage their ISPs are forced to take steps to protect their networks and hosting services.

If you have just bought hosting for your website, you will be curious to know which other websites are sharing a C IP address of the same class. Because it is most likely that your site has been assigned this class of IP address and shared an address with other websites.

You can use a bulk IP checker from Just go to  from your browser search and highlight the "Class C IP Checker" icon and click on it. Or you can copy/paste in your browser's search address bar.

On the display page, you must enter at least two and a maximum of twenty domain names. After entering the domain names, click on the "Check Now" button. The utility will run the test and return the results.

In the results, it will display the hostnames you entered, and against each hostname, it will display their IP address, class C, and status.

The results will show you hosts that are sharing a C IP address of the same class, and if the status is "valid" then everything is fine. This duplicate IP address checker is handy to know which other sites are using the same IP address.

You can use this great tool from at any time to run C IP address checker at any time class.

In addition, you can run a bulk IP blacklist check. You can run this check from some sites on the Internet. This test will show if the websites are clean and the tools used to protect them from viruses, spam, and malware.