ulagen.py is a short python script to generate an IPv6 unique local address as
per the pseudo-random algorithm defined in RFC
4193. Run it without any arguments. For
example:
% ./ulagen.py
Prefix: fdf3:5237:bf63::/48
First subnet: fdf3:5237:bf63::/64
Last subnet: fdf3:5237:bf63:ffff::/64