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Network Admin

Internet Protocol Network Mask Cheat Sheet

 

Number of bits
(for CIDR/VLSM)		 Number of addresses
available to nodes*		 Mask

Dotted Quad Binary

Comments

321255.255.255.25511111111.11111111.11111111.11111111 Single host
31 0 255.255.255.25411111111.11111111.11111111.11111110 No hosts
30 2 255.255.255.252 11111111.11111111.11111111.11111100  
29 6 255.255.255.248 11111111.11111111.11111111.11111000  
28 14 255.255.255.240 11111111.11111111.11111111.11110000  
27 30 255.255.255.224 11111111.11111111.11111111.11100000  
26 62 255.255.255.192 11111111.11111111.11111111.11000000  
25 126 255.255.255.128 11111111.11111111.11111111.10000000  
24 254 255.255.255.0 11111111.11111111.11111111.00000000 "Class C"
23  255.255.254.0 11111111.11111111.11111110.00000000  
22  255.255.252.0 11111111.11111111.11111100.00000000  
21  255.255.248.0 11111111.11111111.11111000.00000000  
20  255.255.240.0 11111111.11111111.11110000.00000000  
19  255.255.224.0 11111111.11111111.11100000.00000000  
18  255.255.192.0 11111111.11111111.11000000.00000000  
17  255.255.128.0 11111111.11111111.10000000.00000000  
16 65,000 255.255.0.0 11111111.11111111.00000000.00000000 "Class B"
15  255.254.0.0 11111111.11111110.00000000.00000000  
14  255.252.0.0 11111111.11111100.00000000.00000000  
13  255.248.0.0 11111111.11111000.00000000.00000000  
12  255.240.0.0 11111111.11110000.00000000.00000000  
11  255.224.0.0 11111111.11100000.00000000.00000000  
10  255.192.0.0 11111111.11000000.00000000.00000000  
9  255.128.0.0 11111111.10000000.00000000.00000000  
8 16,000,000 255.0.0.0 11111111.00000000.00000000.00000000 "Class A"
7  254.0.0.0 11111110.00000000.00000000.00000000  
6  252.0.0.0 11111100.00000000.00000000.00000000  
5  248.0.0.0 11111000.00000000.00000000.00000000  
4  240.0.0.0 11110000.00000000.00000000.00000000  
3  224.0.0.0 11100000.00000000.00000000.00000000  
2  192.0.0.0 11000000.00000000.00000000.00000000  
1  128.0.0.0 10000000.00000000.00000000.00000000  
0 4G 0.0.0.0 00000000.00000000.00000000.00000000 Everything

* This includes an address for the gateway. Thus on a class "C" subnet you can only have 253 nodes.
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