Marc Perkel <marc@???> said, in message
432E4B47.9070409@???:
> New revised code at bottom.
>
> If the part second to the end is co com net org then it's 3 part.
Where should news.com.com be split up?
What would you want for
www.aber.ac.uk?
How about
www.alumni.aber.ac.uk?
Or something.demon.co.uk?
Determining a suitable subdomain is a black art. I tried it a few
years ago for spam reporting (back when it was actually useful to
do such). Best I could do was something like (feel free to criticise!):
function maildomain(name)
{
domain = ""
mx = ""
# Find longest "domain" part which has an MX lookup.
while (name <> "")
{
mx = mx lookup for name
if (mx <> "")
{
domain = name
break;
}
strip first component from name
}
# Find shortest "domain" part which has the same MX lookup.
while (name <> "")
{
mx2 = mx lookup for name
if (mx2 == mx)
{
domain = name
}
else
{
break;
}
strip first component from name
}
return domain
}
Cheers,
Alun.
--
Alun Jones auj@???
Systems Support, (01970) 62 2494
Information Services,
University of Wales, Aberystwyth
