> I'm assuming that when the hostname is pure number, it ignores domain
> suffix. As just a number cannot be an actual IP, could this behavior be
> fixed in OpenSSH?
A number _is_ (or can be) a valid IPv4.
$ perl -e 'print gethostbyname(shift)."\n"' 65.65.65.65
AAAA
$ perl -e 'print gethostbyname(shift)."\n"' 1094795585
AAAA
You can leave out parts of the IP address:
$ perl -e 'print gethostbyname(shift)."\n"' 65.65 | hd
00000000 41 00 00 41 0a |A..A.|
See also
http://serverfault.com/questions/638260/is-it-valid-for-a-hostname-to-start-with-a-digit
for some more discussion and links.
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