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bpo-30528 Update ipaddress.py with reverse_pointer method for networks #25371

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bpo-30528 Update ipaddress.py with reverse_pointer method for networks #25371

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13 changes: 13 additions & 0 deletions Lib/ipaddress.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1525,6 +1525,14 @@ def is_global(self):
self.broadcast_address in IPv4Network('100.64.0.0/10')) and
not self.is_private)

def _reverse_pointer(self):
"""Return the reverse DNS pointer name for the IPv4 network.

This implements the method described in RFC1035 3.5.

"""
return self.network_address.reverse_pointer.split(".", int((self.max_prefixlen - self.prefixlen) / 8))[-1]


class _IPv4Constants:
_linklocal_network = IPv4Network('169.254.0.0/16')
Expand Down Expand Up @@ -2243,6 +2251,11 @@ def is_site_local(self):
return (self.network_address.is_site_local and
self.broadcast_address.is_site_local)

def _reverse_pointer(self):
"""Return the reverse DNS pointer name for the IPv6 address.

"""
return self.network_address.reverse_pointer.split(".", int((self.max_prefixlen - self.prefixlen) / 4))[-1]

class _IPv6Constants:

Expand Down