`converter.Converter.ipv6_prefix` does not match `fe80::21b:aabb:0:0`
Actually I wasn't able to come up with a prefix that would match the regular expression in question.
Example:
>>> import converter
>>> print(converter.Converter.ipv6_prefix.match("fe80::21b:aabb:0:0"))
None
>>> print(converter.Converter.ipv6_prefix.match("2001:0db8"))
None