VLSM CIDR IPV4 Class A Subnet Mask Cheat Sheet

This is the vlsm CIDR ipv4 class a subnet mask cheat sheet or chart. It contains Network bits (8 to 30), subnet mask ( 255.0.0.0 to 255.255.255.252), number of effective subnets and number of effective hosts.

Network Bits Subnet Mask Number of Subnets Number of Hosts
8 255.0.0.0 0 16777214
9 255.128.0.0 2 (0) 8388606
10 255.192.0.0 4 (2) 4194302
11 255.224.0.0 8 (6) 2097150
12 255.240.0.0 16 (14) 1048574
13 255.248.0.0 32 (30) 524286
14 255.252.0.0 64 (62) 262142
15 255.254.0.0 128 (126) 131070
16 255.255.0.0 256 (254) 65534
17 255.255.128.0 512 (510) 32766
18 255.255.192.0 1024 (1022) 16382
19 255.255.224.0 2048 (2046) 8190
20 255.255.240.0 4096 (4094) 4094
21 255.255.248.0 8192 (8190) 2046
22 255.255.252.0 16384 (16382) 1022
23 255.255.254.0 32768 (32766) 510
24 255.255.255.0 65536 (65534) 254
25 255.255.255.128 131072 (131070) 126
26 255.255.255.192 262144 (262142) 62
27 255.255.255.224 524288 (524286) 30
28 255.255.255.240 1048576 (1048574) 14
29 255.255.255.248 2097152 (2097150) 6
30 255.255.255.252 4194304 (4194302) 2

Use this complete class a subnet cheat sheet or chat to learn the information of IPv4 easily.