IP Subset Mask Table

Mindwatering Incorporated

Author: Tripp W Black

Created: 01/03/2005 at 12:09 AM

 

Category:
General Web Tips
Other

Table B-1: Common Subnet Masks and Their Host Counts
Subnet Mask (Slash Prefix)
Subnet Mask (Dotted Decimal)
Network Bits in Subnet Mask
Host Bits in Subnet Mask
Hosts per Net
/16
255.255.0.0
16
16
65,534
/17
255.255.128.0
17
15
32,766
/18
255.255.192.0
18
14
16,382
/19
255.255.224.0
19
13
8,190
/20
255.255.240.0
20
12
4,094
/21
255.255.248.0
21
11
2,046
/22
255.255.252.0
22
10
1,022
/23
255.255.254.0
23
9
510
/24
255.255.255.0
24
8
254
/25
255.255.255.128
25
7
126
/26
255.255.255.192
26
6
62
/27
255.255.255.224
27
5
30
/28
255.255.255.240
28
4
14
/29
255.255.255.248
29
3
6
/30
255.255.255.252
30
2
2


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