The s6-randomip program

s6-randomip generates random IP addresses and prints them to its standard output, one per line.

Interface

     s6-randomip [ -4 ] [ -6 ] [ -n max ]

s6-randomip makes up IP addresses and prints them to its stdout. It keeps running until it receives a signal.
IP addresses are not guaranteed to represent anything. They are totally random.

-4 : generate IPv4 addresses.
-6 : generate IPv6 addresses. Both the -4 and -6 options may be given. If none is given, by default s6-randomip will only generate IPv4 addresses.
-n max : s6-randomip will only generate max addresses, then exit 0, instead of running forever.

s6-randomip can be used in conjunction with s6-dnsname-filter to stress-test your DNS architecture. Please use this responsibly and ethically.