Nmap main developer announced availability of nmap version 4.20 (as posted on http://seclists.org/nmap-dev/2006/q4/0172.html ):

Hi Everyone,

I just posted the binaries for 4.20! Woohoo! This is the first “stable” release in almost 6 months, and contains tons of important changes over 4.11. But I think you guys are well familiar with those. Please give it a try in the next few hours if you can. Unless I hear about important problems, I’ll release it to the nmap-hackers later tonight or tomorrow morning. That posting will include a summary of changes, stupid pot smoking jokes, etc.

You can find the goods at:

http://download.insecure.org/nmap/dist/nmap-4.20.tar.bz2
http://download.insecure.org/nmap/dist/nmap-4.20-s...up.exe
http://download.insecure.org/nmap/dist/nmap-4.20-w...32.zip
http://download.insecure.org/nmap/dist/nmap-4.20-1...rc.rpm
http://download.insecure.org/nmap/dist/nmap-4.20-1...86.rpm
http://download.insecure.org/nmap/dist/nmap-fronte...86.rpm
http://download.insecure.org/nmap/dist/nmap-4.20-1...64.rpm
http://download.insecure.org/nmap/dist/nmap-fronte...64.rpm
http://download.insecure.org/nmap/dist/nmap-4.20.tgz

And here are the changes since RC2:

o Integrated the latest OS fingerprint submissions. The 2nd generation DB size has grown to 231 fingerprints. Please keep them coming! New fingerprints include Mac OS X Server 10.5 pre-release, NetBSD 4.99.4, Windows NT, and much more.

o Fixed a segmentation fault in the new OS detection system which was reported by Craig Humphrey and Sebastian Garcia.

o Fixed a TCP sequence prediction difficulty indicator bug. The index is supposed to go from 0 (”trivial joke”) to about 260 (OpenBSD). But some systems generated ISNs so insecurely that Nmap went
berserk and reported a negative difficulty index. This generally only affects some printers, crappy cable modems, and Microsoft Windows (old versions). Thanks to Sebastian Garcia for helping me
track down the problem.

Enjoy!
Fyodor

Additional Info

nmap is one of the most powerful network scanners that can be used for network auditing. nmap is capable to perform various types of network scan, e.g. TCP and UDP port scan. It can be installed on a wide variety of platforms, including Windows, Linux, various Unix systems.

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