Mike's PBX Cookbook

Binary Subnet Mask

CIDRSubnet Mask
(decimal)
Subnet Mask(binary)Available addresses
/00.0.0.000000000 00000000 00000000 000000004.294.967.296232
/1128.0.0.010000000 00000000 00000000 000000002.147.483.648231
/2192.0.0.011000000 00000000 00000000 000000001.073.741.824230
/3224.0.0.011100000 00000000 00000000 00000000536.870.912229
/4240.0.0.011110000 00000000 00000000 00000000268.435.456228
/5248.0.0.011111000 00000000 00000000 00000000134.217.728227
/6252.0.0.011111100 00000000 00000000 0000000067.108.864226
/7254.0.0.011111110 00000000 00000000 0000000033.554.432225
/8255.0.0.011111111 00000000 00000000 0000000016.777.216224
/9255.128.0.011111111 10000000 00000000 000000008.388.608223
/10255.192.0.011111111 11000000 00000000 000000004.194.304222
/11255.224.0.011111111 11100000 00000000 000000002.097.152221
/12255.240.0.011111111 11110000 00000000 000000001.048.576220
/13255.248.0.011111111 11111000 00000000 00000000524.288219
/14255.252.0.011111111 11111100 00000000 00000000262.144218
/15255.254.0.011111111 11111110 00000000 00000000131.072217
/16255.255.0.011111111 11111111 00000000 0000000065.536216
/17255.255.128.011111111 11111111 10000000 0000000032.768215
/18255.255.192.011111111 11111111 11000000 0000000016.384214
/19255.255.224.011111111 11111111 11100000 000000008.192213
/20255.255.240.011111111 11111111 11110000 000000004.096212
/21255.255.248.011111111 11111111 11111000 000000002.048211
/22255.255.252.011111111 11111111 11111100 000000001.024210
/23255.255.254.011111111 11111111 11111110 0000000051229
/24255.255.255.011111111 11111111 11111111 0000000025628
/25255.255.255.12811111111 11111111 11111111 1000000012827
/26255.255.255.19211111111 11111111 11111111 110000006426
/27255.255.255.22411111111 11111111 11111111 111000003225
/28255.255.255.24011111111 11111111 11111111 111100001624
/29255.255.255.24811111111 11111111 11111111 11111000823
/30255.255.255.25211111111 11111111 11111111 11111100422
/31255.255.255.25411111111 11111111 11111111 11111110221
/32255.255.255.25511111111 11111111 11111111 11111111120