From: | "Bort, Paul" <pbort(at)tmwsystems(dot)com> |
---|---|
To: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Email data type |
Date: | 2004-05-17 16:00:30 |
Message-ID: | 735D404BD9E7EB44B9CDFC27FC88809B01C4D94A@mail2.tmwsystems.com |
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Lists: | pgsql-hackers |
> From: Gaetano Mendola [mailto:mendola(at)bigfoot(dot)com]
>
> I think I have to discard also the addresses with last octet
> equal to 256.
>
> Any comments ?
>
Any octet that contains a number less than 0 or greater than 255 should be
suspect.
Assuming you really meant 255:
It would be perfectly legal for an entity on the internet to have a block of
addresses with a subnet mask of less than 24 bits, which leads to legal
addresses that end in 255.
For example, if your company/university/black helicopter squad needed about
500 servers with direct presence, you might be assigned a block like
123.45.6.0/23. So the network address would be 123.45.6.0, the broadcast
address would be 123.45.7.255, and everything in between, including
123.45.6.255 and 123.45.7.0, would be available for your servers.
HTH,
Paul
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