Who owns class a networks

To get an overall view of the IPv4 address space, I went ahead and compiled a list of all Class A and Class B networks for the enjoyment of the interested public.

The data was then put into a form suitable to be displayed in a table using custom built Perl scripts. The data was retrieved from the registry databases on Sept 3, , and the final version of the Network Tables was uploaded onto this server on Sept 19, For simplicity, we assume the classic subdivision into A, B, etc. There are two other networks that are not commonly used, class D and Class E. Class D has its highest bit order set to it is used to support multicasting.

Class E has its highest bit order set to which is reserved for experimental use. Go back to Tutorial. A B and C Classes of Networks. Following are the ranges of Class A, B, and C Internet addresses, each with an example address: Class A networks use a default subnet mask of The address Its first octet is 10, which is between 1 and , inclusive.

Class B networks use a default subnet mask of Its first octet is , which is between and , inclusive. Class C networks use a default subnet mask of Get industry recognized certification — Contact us Please enable JavaScript in your browser to complete this form. A class A network number uses the first eight bits of the IP address as its "network part.

The values assigned to the first byte of class A network numbers fall within the range Consider the IP address The value 75 in the first byte indicates that the host is on a class A network. The remaining bytes, 4. Use of the remaining three bytes is left to the discretion of the owner of the network number. Only class A networks can exist. Each one of these numbers can accommodate up to 16,, hosts.

A class B network number uses 16 bits for the network number and 16 bits for host numbers. The first byte of a class B network number is in the range In the number The last two bytes, Figure graphically illustrates a class B address.

Class B is typically assigned to organizations with many hosts on their networks. Class C network numbers use 24 bits for the network number and 8 bits for host numbers.