Various copies of nmap: download.insecure.org official one, dead after 2008 nmap.org official one, alive only in 2013-2014 nmap.ucsd.edu old (until 2009?), lost, empty sourceforge unofficial mirror on SourceForge until 2014 dist-old copy from official nmap.org WWW with dates corrected, updated occasionally dist copy from official nmap.org WWW with dates corrected, updated occasionally