"X.X.X.X/0 looks like an IPv6 target specification" error with proxychains-ng

[dmiller-nmap]

This is a known old bug with Proxychains-NG, which I am entering into our issues tracker to make it more searchable. Here is one of the original reports: http://seclists.org/nmap-dev/2014/q4/54

Example output:

Starting Nmap 6.41SVN ( http://nmap.org ) at 2013-09-22 00:31 AST

|DNS-request| scame.nmap.org
|S-chain|-<>-127.0.0.1:9050-<><>-4.2.2.2:53-<><>-OK
|DNS-response| scame.nmap.org is 173.255.243.189

173.255.243.189/0 looks like an IPv6 target specification -- you have
to use the -6 option.
WARNING: No targets were specified, so 0 hosts scanned.
Nmap done: 0 IP addresses (0 hosts up) scanned in 1.56 seconds

[dmiller-nmap]

Proxychains-NG before version 4.8 does not respect the AI_NUMERICHOST flag to
getaddrinfo. Proxychains-NG changelog message for version 4.8:

- fix for odd cornercase where getaddrinfo was used with AI_NUMERICHOST to test for a numeric ip instead of resolving it (fixes nmap).