ansible 2.1.1.0
  config file = /Users/Yves/Development/dock42-ansible/ansible.cfg
  configured module search path = Default w/o overrides

OS X Yosemite 10.10.5 (14F1909)

14.5.0 Darwin Kernel Version 14.5.0: Thu Jun 16 19:58:21 PDT 2016; root:xnu-2782.50.4~1/RELEASE_X86_64 x86_64

Python 2.7.10
netaddr 0.7.18

##### SUMMARY
When specifying an address which is prefixed with /32 then the Jinja filter just renders an empty string. Also the Jinja filter does not allow prefixlen as query method - even if the locally installed version supports this method.

netaddr seems to work correctly.

##### STEPS TO REPRODUCE

Try to render this:

{{ 192.168.0.1/32 | ipaddr('netmask') }}

{{ 192.168.0.1/32 | ipaddr('netmask') }}
#255.255.255.255

{{ 192.168.0.1/32 | ipaddr('netmask') }}
# <empty>

$ python -i
Python 2.7.10 (default, Jul 14 2015, 19:46:27) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from netaddr import *
>>> ip = IPNetwork('192.0.0.1/32')
>>> ip.netmask
IPAddress('255.255.255.255')
>>> ip.prefixlen
32
>>> ip = IPNetwork('192.0.0.1/24')
>>> ip.netmask

{{ 192.168.0.1/24 | ipaddr('netmask') }}
#255.255.255.0

prefixlen={{ ipv4 | ipaddr('prefixlen') }} 
# AnsibleFilterError: ipaddr: unknown filter type: prefixlen