Classful Ip Addressess

90025309

Does anyone understand Classful Ip Addressess?

I think I understand the IP ranges, but i am not sure.

Anyone Able to clarify the IP ranges for each class?

malcybood

http://www.cisco.com/univercd/cc/td/doc/product/atm/l2020/2020r21x/planning/appndxa.htm

Class A--Only the first field identifies the network, and the number in the first field must be in the range 1 - 126 (127 is reserved for loopback). Class A networks are very large. Host numbers 0.0.0 and 255.255.255 are reserved, and one octet is reserved for other purposes, so there can be almost 17 million (224-2) hosts in a class A network. The 126 class A network numbers have been allocated.

Example: 26.4.0.1, for host 4.0.1 on net number 26.


Class B--The first two fields identify the network, and the number in the first field must be in the range 128 - 191. Class B networks are large. Host numbers 0.0 and 255.255 are reserved, so there can be up to 65,534 (216-2) hosts in a class B network. Most of the 16,382 class B addresses have been allocated.

Example: 128.89.0.26, for host 0.26 on net 128.89.


Class C--The first three fields identify the network, and the number in the first field must be in the range 192 - 223. (The range 224 - 255 is reserved for classes D and E, for experimental work.) Class C networks are relatively small. Host numbers 0 and 255 are reserved, so there can be up to 254 (28-2) hosts in a class C network. Most LANs are class C networks. There can be over 2 million class C networks in an internet.

Example: 192.15.28.16, for host 16 on net 192.15.28.

90025309

Thanks for that, now i can get on with my studies