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IP Subnetting Summary Tables For Class A, Class B and Class C Networks
(Page 3 of 4)
Class B
# 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) |
16 |
1 |
65,534 |
11111111.11111111.00000000.00000000 255.255.0.0 |
/16 |
-- |
|
1 |
15 |
2 |
32,766 |
11111111.11111111.10000000.00000000 255.255.128.0 |
/17 |
x.y.N*128.0 |
|
2 |
14 |
4 |
16,382 |
11111111.11111111.11000000.00000000 255.255.192.0 |
/18 |
x.y.N*64.0 |
|
3 |
13 |
8 |
8,190 |
11111111.11111111.11100000.00000000 255.255.224.0 |
/19 |
x.y.N*32.0 |
|
4 |
12 |
16 |
4,094 |
11111111.11111111.11110000.00000000 255.255.240.0 |
/20 |
x.y.N*16.0 |
|
5 |
11 |
32 |
2,046 |
11111111.11111111.11111000.00000000 255.255.248.0 |
/21 |
x.y.N*8.0 |
|
6 |
10 |
64 |
1,022 |
11111111.11111111.11111100.00000000 255.255.252.0 |
/22 |
x.y.N*4.0 |
|
7 |
9 |
128 |
510 |
11111111.11111111.11111110.00000000 255.255.254.0 |
/23 |
x.y.N*2.0 |
|
8 |
8 |
256 |
254 |
11111111.11111111.11111111.00000000 255.255.255.0 |
/24 |
x.y.N.0 |
|
9 |
7 |
512 |
126 |
11111111.11111111.11111111.10000000 255.255.255.128 |
/25 |
x.y.N/2. (N%2)*128 |
|
10 |
6 |
1,024 |
62 |
11111111.11111111.11111111.11000000 255.255.255.192 |
/26 |
x.y.N/4. (N%4)*64 |
|
11 |
5 |
2,048 |
30 |
11111111.11111111.11111111.11100000 255.255.255.224 |
/27 |
x.x.N/8. (N%8)*32 |
|
12 |
4 |
4,096 |
14 |
11111111.11111111.11111111.11110000 255.255.255.240 |
/28 |
x.y.N/16. (N%16)*16 |
|
13 |
3 |
8,192 |
6 |
11111111.11111111.11111111.11111000 255.255.255.248 |
/29 |
x.y.N/32. (N%32)*8 |
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14 |
2 |
16,384 |
2 |
11111111.11111111.11111111.11111100 255.255.255.252 |
/30 |
x.y.N/64. (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.