Msg#: 3252411 posted 2:13 pm on Feb 14, 2007 (gmt 0)
Depends on which web-server you use.
If Apache, then is provided as standard via Virtual domains. The precise implementation may depend on which flavour of Linux (different distros can give slightly different variations on the httpd.conf file that is principally used to implement this), but the number of domains and/or sub-domains is literally able to go into the millions.
[edited by: AlexK at 2:15 pm (utc) on Feb. 14, 2007]