Why Do 16-Block IP Blocks Have 13 Usable Addresses?

Will DELETE_westes at earthbroadcast.com
Wed Dec 15 18:40:37 UTC 2004

When you are assigned a 16-block (/28) IP address block by an
ISP, why are only 13 IPs usable?   I was told that the first and
last addresses in the block are not usable, and the 14th address
is the gateway.   What are the first and last address used for?

Internet: westes at earthbroadcast.com

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