Skip to main content

Cidrize parses IPv4/IPv6 addresses, CIDRs, ranges, and wildcard matches & attempts return a valid list of IP addresses

Project description

=======
CIDRIZE
=======

Intelligently parse IPv4/IPv6 addresses, CIDRs, ranges, and wildcard matches to
attempt return a valid list of IP addresses.

The ``cidrize()`` function does all the work trying to parse IP addresses correctly.

Supported input formats
-----------------------

Input is very flexible and can be of any of the following formats::

192.0.2.18
192.0.20.64/26
192.0.2.80-192.0.2.85
192.0.2.170-175
192.0.2.8[0-5]
192.0.2.[5678]

Hyphenated ranges do not need to form a CIDR block but the starting number must
be of lower value than the end. The ``netaddr`` module does most of the heavy
lifting for us here.

Unsupported formats
-------------------

Network mask (e.g. 192.0.2.0 255.255.255.0) and host mask (aka reverse mask,
192.0.2.0 0.0.0.255) notation are not accepted at this time.

The cidrize function returns a list of consolidated ``netaddr.IPNetwork``
objects. By default parsing exceptions will raise a ``CidrizeError`` (with
default argument of ``modular=True``). You may pass ``modular=False`` to cause
exceptions to be stripped and the error text will be returned as a list. This
is intended for use with scripts or APIs where receiving exceptions would not
be preferred.

The module may also be run as a script for debugging purposes.

============
Dependencies
============

:`netaddr <http://pypi.python.org/pypi/netaddr/>`_: Pythonic manipulation of
IPv4, IPv6, CIDR, EUI and MAC network addresses

=====
Usage
=====

Fire up your trusty old Python interpreter and follow along!

::

>>> from cidrize import cidrize

Old-fashioned CIDR
------------------

::

>>> cidrize("1.2.3.4")
[IPNetwork('1.2.3.4/32')]

Hyphenated range (default, strict=False)
----------------------------------------

::

>>> cidrize("2.4.6.8-2.4.6.80")
[IPNetwork('2.4.6.0/25')]

Hyphenated range strict (strict=True)
----------------------------------------

::

>>> cidrize("2.4.6.8-2.4.6.80", strict=True)
[IPNetwork('2.4.6.8/29'), IPNetwork('2.4.6.16/28'),
IPNetwork('2.4.6.32/27'), IPNetwork('2.4.6.64/28'),
IPNetwork('2.4.6.80/32')]

Wildcard
--------

You may provide wildcards using asterisks. This is limited to the 4th and final octet only::

>>> cidrize("15.63.148.*")
[IPNetwork('15.63.148.0/24')]

Bracketed range
---------------

::

>>> cidrize("21.43.180.1[40-99]")
[IPNetwork('21.43.180.140/30'), IPNetwork('21.43.180.144/28'),
IPNetwork('21.43.180.160/27'), IPNetwork('21.43.180.192/29')]

Bad!
----

Bad CIDR prefixes are rejected outright::

>>> cidrize("1.2.3.38/40")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "cidrize.py", line 145, in cidrize
raise CidrizeError(err)
cidrize.CidrizeError: CIDR prefix /40 out of range for IPv4!

Wack range?!
------------

Ranges must always start from lower to upper bound, or this happens::

>>> cidrize("1.2.3.4-0")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "cidrize.py", line 145, in cidrize
raise CidrizeError(err)
cidrize.CidrizeError: lower bound IP greater than upper bound!

=========
Cidr Tool
=========

The cidrize package also comes with the ``cidr`` command, which has two basic operations.

Simple output::

% cidr 1.2.3.4/30
1.2.3.4/30

Verbose output::

% cidr -v 1.2.3.4/30
Spanning CIDR: 1.2.3.4/30
Block Start/Network: 1.2.3.4
1st host: 1.2.3.5
Gateway: 1.2.3.6
Block End/Broadcast: 1.2.3.7
DQ Mask: 255.255.255.252
Cisco ACL Mask: 0.0.0.3
# of hosts: 2
Explicit CIDR blocks: 1.2.3.4/30

And that's that!


=======
License
=======

Cidrize is licensed under the `BSD 3-Clause License <http://www.opensource.org/licenses/BSD-3-Clause>`_. Please see ``LICENSE.rst``
for the details.

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

cidrize-0.6.3.tar.gz (11.2 kB view hashes)

Uploaded Source

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page