Iptools

A set of functions for working with IPv4 addresses.

• is_ipv4?/1 - checks if a string is an IPv4 address.
• is_rfc1918?/1 - checks if a string is an RFC1918 reserved address.
• is_reserved?/1 - checks if a string is any kind of reserved address. More complete than just RFC1918.
• to_integer/1 - convert IP address string to integer.
• is_between?/3 - checks if the first IP address is between the next two addresses (inclusive).

There are also some functions for manipulating subnet masks.

• subnet_bit_string/1 - converts subnet mask to string of ones and zeros.
• subnet_bit_count/1 - converts subnet mask to integer count of bits.

Reserved IP addresses

You almost certainly want to use is_reserved?/1 to find out if an IP address is “normal” or not. There are a lot of reserved addresses, such as the 0.0.0.0/8 network which are not RFC1918 addresses. So unless you’re really checking for just RFC1918, use is_reserved?/1.

Running tests

I’ve got 100% test coverage for the first time in my whole life! Run mix test to see if they still pass.

License

Copyright (c) 2016, Kevin Thompson.

This work is free. You can redistribute it and/or modify it under the terms of the MIT License. See the LICENSE.md file for more details.