IP Addesses on local network

Greetings, Th command echo gethostbyaddr("ip.number.inserted.here"); returns the name of the server when it`s an internet address. Is there a similar command that will return host names on a local network.... I tried using the above command putting in a LAN address, but it just returned the IP address..... -- Chris Blake Office : (011) 782-0840 Cell : 083 985 0379 It is reported that somewhere in the world, every 15 seconds, a woman gives birth to a child. She must be found and stopped.