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IP Subnetting Summary Tables For Class A, Class B and Class C Networks
(Page 2 of 4)
Class A
# of Subnet ID Bit |
# of Host ID Bits |
# of Subnets Per Network |
# of |
Subnet Mask (Binary / Dotted Decimal) |
Subnet Mask (Slash/ CIDR Notation) |
Subnet Address #N Formula (N=0, 1, … # of Subnets-1) |
|
0 (Default) |
24 |
1 |
16,277,214 |
11111111.00000000.0000000.00000000 255.0.0.0 |
/8 |
— |
|
1 |
23 |
2 |
8,388,606 |
11111111.10000000.0000000.00000000 255.128.0.0 |
/9 |
x.N*128.0.0 |
|
2 |
22 |
4 |
4,194,302 |
11111111.11000000.0000000.00000000 255.192.0.0 |
/10 |
x.N*64.0.0 |
|
3 |
21 |
8 |
2,097,150 |
11111111.11100000.00000000.00000000 255.224.0.0 |
/11 |
x.N*32.0.0 |
|
4 |
20 |
16 |
1,048,574 |
11111111.11110000.00000000.00000000 255.240.0.0 |
/12 |
x.N*16.0.0 |
|
5 |
19 |
32 |
524,286 |
11111111.11111000.00000000.00000000 255.248.0.0 |
/13 |
x.N*8.0.0 |
|
6 |
18 |
64 |
262,142 |
11111111.11111100.00000000.00000000 255.252.0.0 |
/14 |
x.N*4.0.0 |
|
7 |
17 |
128 |
131,070 |
11111111.11111110.00000000.00000000 255.254.0.0 |
/15 |
x.N*2.0.0 |
|
8 |
16 |
256 |
65,534 |
11111111.11111111.00000000.00000000 255.255.0.0 |
/16 |
x.N.0.0 |
|
9 |
15 |
512 |
32,766 |
11111111.11111111.10000000.00000000 255.255.128.0 |
/17 |
x.N/2. (N%2)*128.0 |
|
10 |
14 |
1,024 |
16,382 |
11111111.11111111.11000000.00000000 255.255.192.0 |
/18 |
x.N/4. (N%4)*64.0 |
|
11 |
13 |
2,048 |
8,190 |
11111111.11111111.11100000.00000000 255.255.224.0 |
/19 |
x.N/8. (N%8)*32.0 |
|
12 |
12 |
4,096 |
4,094 |
11111111.11111111.11110000.00000000 255.255.240.0 |
/20 |
x.N/16. (N%16)*16.0 |
|
13 |
11 |
8,192 |
2,046 |
11111111.11111111.11111000.00000000 255.255.248.0 |
/21 |
x.N/32. (N%32)*8.0 |
|
14 |
10 |
16,384 |
1,022 |
11111111.11111111.11111100.00000000 255.255.252.0 |
/22 |
x.N/64. (N%64)*4.0 |
|
15 |
9 |
32,768 |
510 |
11111111.11111111.11111110.00000000 255.255.254.0 |
/23 |
x.N/128. (N%128)*2.0 |
|
16 |
8 |
65,536 |
254 |
11111111.11111111.11111111.00000000 255.255.255.0 |
/24 |
x.N/256. N%256.0 |
|
17 |
7 |
131,072 |
126 |
11111111.11111111.11111111.10000000 255.255.255.128 |
/25 |
x.N/512. (N/2)%256. (N%2)*128 |
|
18 |
6 |
262,144 |
62 |
11111111.11111111.11111111.11000000 255.255.255.192 |
/26 |
x.N/1024. (N/4)%256. (N%4)*64 |
|
19 |
5 |
524,288 |
30 |
11111111.11111111.11111111.11100000 255.255.255.224 |
/27 |
x.N/2048. (N/8)%256. (N%8)*32 |
|
20 |
4 |
1,048,576 |
14 |
11111111.11111111.11111111.11110000 255.255.255.240 |
/28 |
x.N/4096. (N/16)%256. (N%16)*16 |
|
21 |
3 |
2,097,152 |
6 |
11111111.11111111.11111111.11111000 255.255.255.248 |
/29 |
x.N/8192. (N/32)%256. (N%32)*8 |
|
22 |
2 |
4,194,304 |
2 |
11111111.11111111.11111111.11111100 255.255.255.252 |
/30 |
x.N/16384. (N/64)%256. (N%64)*4 |
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.