Security community rejoice: NMAP 4.0 is OUT!
Two years after the release of version 3.50, Insecure.Org just announce the immediate, free availability of the Nmap Security Scanner v.4.00. Nmap is pretty much the best free port scanner available on the internet today.
Changes since version 3.50 include a rewritten (for speed and memory efficiency) port scanning engine, ARP scanning, runtime interaction, massive version detection improvements, MAC address spoofing, increased Windows performance, 500 new OS detection fingerprints, and completion time estimates. Dozens of other important changes, and future plans for Nmap, are also listed in the release announcement.
Check it out.