After a six-month development series with 13 beta releases, Insecure.Org is pleased to announce the immediate, free availability of the Nmap Security Scaner version 4.20 from the Nmap download page.

Changes in this release include a second generation OS detection system, IP option support (source routing, record route, etc.), an --open option for showing only open ports, version detection database updates, more detailed XML output, and dozens of bug fixes and performance enhancements. The full list of changes since 4.11 can be read at the Nmap changelog.