[New-bugs-announce] [issue30528] ipaddress.IPv{4, 6}Network.reverse_pointer is broken

[Hristo Venev]

New submission from Hristo Venev:

`ipaddress.IPv4Network('127.0.0.0/16').reverse_pointer = '0/16.0.0.127.in-addr.arpa'` is definitely wrong. I think it should be '0.127.in-addr.arpa'.

A funnier case, `ipaddress.IPv6Network('2001:db8::/32').reverse_pointer = '2.3./.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa'`.

For the case where no single reverse pointer exists (e.g. `127.0.0.0/13`), I think it should be `None`.

----------
components: Library (Lib)
messages: 294854
nosy: h.venev
priority: normal
severity: normal
status: open
title: ipaddress.IPv{4,6}Network.reverse_pointer is broken
type: behavior
versions: Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30528>
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