IP4R is a PostgreSQL extension which supports 6 data types allowing
you to store IPv4 & IPv6 addresses in a PostgreSQL table:
ip4 - a single IPv4 address
ip4r - an arbitrary range of IPv4 addresses
ip6 - a single IPv6 address
ip6r - an arbitrary range of IPv6 addresses
ipaddress - a single IPv4 or IPv6 address
iprange - an arbitrary range of IPv4 or IPv6 addresses
While PostgreSQL already has builtin types 'inet' and 'cidr', the
authors of this module found that they had a number of requirements
that were not addressed by the builtin types.
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