HTTP scanners?

[scorpus () CROSSWINDS NET (Scorpus Kahn)]

I don't know if I am asking the right question or not, but I want to know if
there is
such a thing as a HTTP scanner? A small utility that allows you to scan
networks/domains
for all hosts that have a httpd running on them and will return the port
number
of the http server, and the make/version of the software. Possibly into a
nicely sorted
log or database. If there is such a thing what is it called?

 -Rory Savage