Alun wrote:
Marc Perkel <[EMAIL PROTECTED]> said, in message
[EMAIL PROTECTED]:
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?
com.com
What would you want for www.aber.ac.uk?
aber.ac.uk
How about www.alumni.aber.ac.uk?
aber.ac.uk
Or something.demon.co.uk?
demon.co.uk
How many can there be? It may take a table ot DB file to pull it off but
I don't think that it would be much more than 100 entries.
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.
--
Marc Perkel - [EMAIL PROTECTED]
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