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ipaddr: Update docs #54587

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Apr 5, 2019
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ipaddr: Update docs #54587

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28 changes: 28 additions & 0 deletions docs/docsite/rst/user_guide/playbooks_filters_ipaddr.rst
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Expand Up @@ -405,6 +405,34 @@ be automatically converted to a router address (with a ``::1/48`` host address):

.. _6to4: https://en.wikipedia.org/wiki/6to4

Finding IP addresses within a range
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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To find usable IP addresses within an IP range, try these ``ipaddr`` filters:

To find the next usable IP address in a range, use ``next_usable`` ::

# {{ '192.168.122.1/24' | ipaddr('next_usable') }}
192.168.122.2

To find the last usable IP address from a range, use ``last_usable``::

# {{ '192.168.122.1/24' | ipaddr('last_usable') }}
192.168.122.254

To find the available range of IP addresses from the given network address, use ``range_usable``::

# {{ '192.168.122.1/24' | ipaddr('range_usable') }}
192.168.122.1-192.168.122.254

To find the next nth usable IP address within a range, use ``next_nth_usable``::

# {{ '192.168.122.1/24' | next_nth_usable(2) }}
192.168.122.3

In this example, ``next_nth_usable`` returns the second usable IP address for the given IP range.


IP Math
^^^^^^^

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