Someone wants to use java and get a host name from an IP address.

I know how to do it lcoally through /etc/hosts BUT the host file does not

have names for every IP address reachable.

 

Someone found http://www.faqs.org/rfcs/rfc953.html which looks like you are supposed to be

able to use port 101 of a machine and connect to it and echo a command and it should respond.

It also says HNAME should give the host name so I tried (from 192.168.5.191)

      echo HNAME | nc -e cat 192.168.5.15 101 

which I would guess should return the host name for machine 192.168.5.15, but I got

no response and a return code of 1.  There is probably something I am overlooking.

Anyone know how to query this port?  (both machines are CentOS 4.5)