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 Ever wonder what the Subnet Mask needed to be when your ISP, or uplink handed you several IPs ? Well here is a simple and quick way to get that information.

Subnet Map :

       No of IPs  Subnetmask
1 net / 256    IP 255.255.255.0   - 24B
2 net / 128    IP 255.255.255.128 - 25B
4 net /  64    IP 255.255.255.192 - 26B
8 net /  32    IP 255.255.255.224 - 27B
16 net / 16    IP 255.255.255.240 - 28B
32 net /  8    IP 255.255.255.248 - 29B
64 net /  4    IP 255.255.255.252 -30B

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