TCP/IP
Rules
Subnet Mask Notation
|
Class |
|
Network Bits | ||
|
A |
0.0.0.0 |
To |
127.255.255.255 |
8 |
|
B |
128.0.0.0 |
To |
191.255.255.255 |
16 |
|
C |
192.0.0.0 |
To |
223.255.255.255 |
24 |
|
D |
224.0.0.0 |
To |
239.255.255.255 |
N/A |
|
E |
240.0.0.0 |
To |
247.255.255.255 |
N/A |
Subnet Mask Table
|
Netmask |
HEX Netmask |
Network Bits |
IP |
Host |
Broadcast |
|
255.0.0.0 |
FF.0.0.0 |
8 |
16777215 |
16777213 |
2 |
|
255.255.0.0 |
FF.FF.0.0 |
16 |
65535 |
65533 |
2 |
|
255.255.255.0 |
FF.FF.FF.0 |
24 |
256 |
254 |
2 |
|
255.255.255.128 |
FF.FF.FF.80 |
25 |
128 |
126 |
2 |
|
255.255.255.192 |
FF.FF.FF.C0 |
26 |
64 |
62 |
2 |
|
255.255.255.224 |
FF.FF.FF.E0 |
27 |
32 |
30 |
2 |
|
255.255.255.240 |
FF.FF.FF.F0 |
28 |
16 |
14 |
2 |
|
255.255.255.248 |
FF.FF.FF.F8 |
29 |
8 |
6 |
2 |
|
255.255.255.252 |
FF.FF.FF.FC |
30 |
4 |
2 |
2 |
|
255.255.255.254 |
FF.FF.FF.FE |
31 |
Invalid |
Invalid |
Invalid |
|
255.255.255.255 |
FF.FF.FF.FF |
32 |
1 |
1 |
0 |
Private IP Address’s Reserved Blocks
|
Class A |
10.0.0.0 |
10.255.255.255 |
|
Class B |
172.16.0.0 |
172.131.255.255 |
|
Class C |
192.168.0.0 |
192.168.255.255 |
|
Binary to Decimal Conversion |
Subnet Mask Binary to Decimal
Conversion | ||||
|
0000 0000 = 0 0000 0001 = 1 0000 0010 = 2 0000 0011 = 3 0000 0100 = 4 0000 0101 = 5 0000 0110 = 6 0000 0111 = 7 0000 1000 = 8 0000 1001 = 9 0000 1010 = 10 0000 1011 = 11 0000 1100 = 12 0000 1101 = 13 0000 1110 = 14 0000 1111 = 15 |
Netmask |
Octet 1 |
Octet 2 |
Octet 3 |
Octet 4 |
|
255.0.0.0 |
11111111 |
00000000 |
00000000 |
00000000 | |
|
255.255.0.0 |
11111111 |
11111111 |
00000000 |
00000000 | |
|
255.255.255.0 |
11111111 |
11111111 |
11111111 |
00000000 | |
|
255.255.255.128 |
11111111 |
11111111 |
11111111 |
10000000 | |
|
255.255.255.192 |
11111111 |
11111111 |
11111111 |
11000000 | |
|
255.255.255.224 |
11111111 |
11111111 |
11111111 |
11100000 | |
|
255.255.255.240 |
11111111 |
11111111 |
11111111 |
11110000 | |
|
255.255.255.248 |
11111111 |
11111111 |
11111111 |
11111000 | |
|
255.255.255.252 |
11111111 |
11111111 |
11111111 |
11111100 | |
|
255.255.255.254 |
11111111 |
11111111 |
11111111 |
11111110 | |
|
255.255.255.255 |
11111111 |
11111111 |
11111111 |
11111111 | |