🚀 go-pugleaf

hi,
It's been suggested by the folks in demon.ip.support that the
following is posted here :- 

I'm trying to find the maximum length allowed for a domain name -
presuming there is one?  I'm suffering from RFC overload on this one
and although I expected it to be in the "Internet Encyclopedia",  a
few searches haven't revealed the information (and as it's a 7Meg file
I don't want to download it!).
Demon announced a while back that 16 character fields were acceptable
for our host names,  but what about the "Demon" field (8?), the com,
edu, ac, field (3?) and the country, aus, uk (3?).
Also, are there just the four fields allowed,e.g.
pmorton.demon.co.uk  or is this expandable further - 
subdomain.pmorton.demon.co.uk ?
Any pointers appreciated. Thanks.

Regards,
Pete
Btw - all this effort is just to determine the string variable size
required for a sockets exercise.  I could, and have, set it to some
figure which will handle the immediate data to hand but would rather
have it determined "properly".