Why Do 16-Block IP Blocks Have 13 Usable Addresses?
stephen at totalflood.com
Wed Dec 15 19:05:22 UTC 2004
On Wed December 15 2004 10:40 am, Will wrote:
> 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?
First adddress is the network ID, last address is the broadcast address.
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