Returns the hostname of the remote host.

Synopsis

• remote_hostname [ip-address]

Description

This returns the hostname of the remote host if it can be determined. If the webserver is running with normal DNS, we return the hostname already looked up and stored in the environment. If it´s running with minimal DNS, we perform a DNS lookup on the IP number to try to get the hostname. If we succeed, we return the hostname, otherwise we return the IP number.

If ip-address is provided, then it attempts to resolve the given IP. Warning: resolution failures can take a long time and make a page callup slow.