Hello There, maybe Offtopic, but i thought this could be interesting for some of you. Nmap 3.51-TEST3 is released with some nice new features for local networks. Nmap now uses the system interface table (as shown by ifconfig) to determine whether a system is on the same network. A database derived from the one distributed by the IEEE is then consulted to report the manufacturer. Here are examples from normal and XML output: MAC Address: 08:00:20:8F:6B:2F (SUN Microsystems Inc.) <address addr="00:A0:CC:63:85:4B" vendor="Lite-on Communications, Inc." addrtype="mac" /> This will maybe helpful for network administrators to track down problem machines (worm-infected, spammers, etc.) This also helps track changes on DHCP networks where the IP addresses can change frequently. its still in development but seems to work well. -- Mit freundlichen Gruessen / kind regards, Cemil Degirmenci wavecon.de