IP NETWORK INDEX
This is a MIRROR. Please note, that the data itself is from 1997 and is not maintained in any way.
An index relating IP network numbers to network names and identities, for class A, B and C networks
|The IP Network Numbering System|
|The present system of IP network numbers,
established in 1981, uses a 32 bit number to identify computers on the internet. These
numbers are represented as a sequence of four 8 bit numbers (octets), each of which
can therefore vary between 0 and 255. The first part of each 32 bit number represents
the network, and the remaining part refers to the individual
||To accommodate different network sizes,
IP address space was originally divided into three sections; Class A (0.x.x.x to 127.x.x.x) - 8 bit network prefix,
Class B (128.0.x.x to 191.255.x.x) - 16 bit network prefix and Class C (192.0.0.x to 223.255.255.x) - 24 bit network prefix.
These classes remain generally applicable, but the introduction of Classless Inter-Domain Routing (CIDR) has allowed
for the more efficient division of address space to create arbitrary sized networks.
|The list is extracted from the whois database at the
Internic. As of December 22, 1997, control
of IP network allocation has passed to
Arin (American Register of Internet Networks). There are similar organisations for European
(www.ripe.net) and Asian-Pacific
For more details about individual networks, use the arin
Please read the FAQ