Firewall, VPN, IDS, and Router Tips #1: Partial Octet Subnetting

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You have a class C address range and you need subnets. You need to decide how to balance the number of subnets against the number of hosts that can be defined per subnet. The following table should help:
Subnet Mask Network ID Bits Host ID Bits Alternate Notation Subnets Hosts per Subnet
26 6 208.99.208.15/26 2 62
27 5 208.99.208.15/27 6 30
28 4 208.99.208.15/28 14 14
29 3 208.99.208.15/29 30 6
30 2 208.99.208.15/30 62 2
For tables covering class A, B, and C, see TCP/IP Subnetting Tables.