Ip Subnet Mask Address Table - 3Com 3C421600A Reference Manual

IP Subnet Mask
Address Table
Sub-net
Bits Bit Positions
Class A 0nnnnnnn.hhhhhhhh.hhhhhhhh.hhhhhhh
h
Class B 10nnnnnn.nnnnnnnn.hhhhhhhh.hhhhhhh
h
2 10nnnnnn.nnnnnnnn.sshhhhhh.hhhhhhhh 255.255.192.0
3 10nnnnnn.nnnnnnnn.ssshhhhh.hhhhhhhh
4 10nnnnnn.nnnnnnnn.sssshhhh.hhhhhhhh
5 10nnnnnn.nnnnnnnn.ssssshhh.hhhhhhhh
6 10nnnnnn.nnnnnnnn.sssssshh.hhhhhhhh
7 10nnnnnn.nnnnnnnn.sssssssh.hhhhhhhh
8 10nnnnnn.nnnnnnnn.ssssssss.hhhhhhhh
9 10nnnnnn.nnnnnnnn.ssssssss.shhhhhhh
10 10nnnnnn.nnnnnnnn.ssssssss.sshhhhhh
11 10nnnnnn.nnnnnnnn.ssssssss.ssshhhhh
12 10nnnnnn.nnnnnnnn.ssssssss.sssshhhh
13 10nnnnnn.nnnnnnnn.ssssssss.ssssshhh
14 10nnnnnn.nnnnnnnn.ssssssss.sssssshh
Class C 110nnnnn.nnnnnnn.ssssssss.hhhhhhhh
2 110nnnnn.nnnnnnnn.nnnnnnnn.sshhhhhh 255.255.255.19
3 110nnnnn.nnnnnnnn.nnnnnnnn.ssshhhhh
4 110nnnnn.nnnnnnnn.nnnnnnnn.sssshhhh
5 110nnnnn.nnnnnnnn.nnnnnnnn.ssssshhh
Subnet masking is used to expand the number of networks due to the
32-bit limitation of the IP address field. When assigned an address by the
NIC, the address can be further broken down to expand the single net
number to many more by using host bits.

IP Subnet Mask Address Table

Decimal Mask HEX Mask
255.0.0.0 FF-00-00-00
255.255.0.0 FF-FF-00-00
FF-FF-C0-00
255.255.224.0 FF-FF-E0-00
255.255.240.0 FF-FF-F0-00
255.255.248.0 FF-FF-F8-00
255.255.252.0 FF-FF-FC-00
255.255.254.0 FF-FF-FE-00
255.255.255.0 FF-FF-FF-00
255.255.255.12 FF-FF-FF-80
8
255.255.255.19 FF-FF-FF-C0
2
255.255.255.22 FF-FF-FF-E0
4
255.255.255.24 FF-FF-FF-F0
0
255.255.255.24 FF-FF-FF-F8
8
255.255.255.25 FF-FF-FF-FC
2
255.255.255.0 FF-FF-FF-00
FF-FF-FF-C0
2
255.255.255.22 FF-FF-FF-E0
4
255.255.255.24 FF-FF-FF-F0
0
255.255.255.24 FF-FF-FF-F8
8
249
Sub-Nets Hosts
Available Available
126 16777124
16384 65534
2 16382
6 8190
14 4094
30 2046
62 1022
126 510
254 154
510 126
1022 62
2046 30
4094 14
8190 6
16382 2
2097152 254
2 62
6 30
14 14
30 6