Project ForgeComputer Networks
Transport Protocols & IP Addressing
GATE 2008
Hard
If a class B network on the Internet has a subnet mask of 255.255.248.0, what is the maximum number of hosts per subnet?
2046
Explanation
255.255.248.0 in binary for the last two octets is 11111000.00000000 — 5 subnet bits (from the third octet) plus 0 from the fourth, leaving 16-5=11 host bits. Maximum hosts = 2¹¹ - 2 = 2048 - 2 = 2046 (excluding the all-0s network and all-1s broadcast addresses).
Source: GATE CS 2008 (2008)
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