SchoofsKelvin / ip-matching

Node module to see whether an IPv4 or IPv6 address matches an IP (range) or subnetwork

IP-Matching

Standalone module with some handy features regarding IPs:

• Quick and easy-to-use way to check whether an IP meets a requirement
• Support for IPv4/IPv6 wildcard addresses, ranges, subnetworks and masks.
• Supports both parsing and outputting all common IPv6 notations
• Utility methods, e.g. next/previous IP, range to a list of CIDRs, ...
• Every release is thoroughly tested and linted before published

Installation

npm install --save ip-matching
# or
yarn add ip-matching

Comes with its own built-in TypeScript declarations with included documentation.

Example

import { getMatch, IPMatch, IPSubnetwork, IPRange, matches } from 'ip-matching';

// matches(ip: string | IP, target: string | IPMatch): boolean;

matches('10.0.0.1', '10.0.0.0/24'); // true
matches('10.0.1.1', '10.0.0.0/24'); // false
matches('abc::def', 'abc:*::def'); // true
matches('abc::def', 'abc:9::def'); // false
matches('0001:2:3:4:5:6:7', '1:2:3:4:5:6:7'); // true

// getMatch returns an instance of
// IPv4, IPv6, IPRange, IPSubnetwork or IPMask, all extending IPMatch
const mySubnet: IPMatch = getMatch('fefe::0001:abcd/112');
mySubnet.type; // 'IPSubnetwork'
mySubnet instanceof IPSubnetwork; // true
mySubnet instanceof IPMatch; // true
mySubnet.toString(); // 'fefe::1:0/112'
mySubnet.matches('FEFE::1:bbbb'); // true
mySubnet.matches('FEFE::2:bbbb'); // false
mySubnet.equals(new IPSubnetwork(new IPv6('fefe::1:abcd'), 112)); // true
mySubnet.getAmount(); // 65536
(mySubnet as IPSubnetwork).getLast().toString(); // 'fefe::1:ffff'

const myIp = new IPv6('a:0:0::B:0:C');
myIp.toString(); // 'a::b:0:c'
myIp.toLongString(); // 'a:0:0:0:0:b:0:c'
myIp.toFullString(); // '000a:0000:0000:0000:0000:000b:0000:000c'
new IPv6('::ffff:a9db:*').toMixedString(); // '::ffff:169.219.*.*'

const myRange = getMatch('10.0.0.0-10.1.2.3') as IPRange;
myRange.convertToMasks().map((mask: IPMask) => mask.convertToSubnet().toString());
// [ '10.0.0.0/16', '10.1.0.0/23', '10.1.2.0/30' ]

const mask1 = getMatch('10.0.1.0/255.0.255.0') as IPMask;
const mask2 = getMatch('10.0.0.0/128.0.0.0') as IPMask;
mask1.isSubsetOf(mask2); // true
mask2.getAmount(); // 2147483648

getMatch('a::abbc:1234/ffff::ff80:000f').toString(); // 'a::ab80:4/ffff::ff80:f'

Note: The matches function and all constructors error for invalid inputs

You can take a look at the test code or the TypeScript declarations for all the features.

Allowed patterns

• IP (IPv4/IPv6)
  • Regular IPv4: 10.0.0.0
  • Wildcard IPv4: 10.0.0.* or even 10.*.0.*
  • Regular IPv6: 2001:0db8:85a3:0000:0000:8a2e:0370:7334
  • Shortened IPv6: 2001:db8:85a3::8a2e:0370:7334 or :: or ::1 or a::
  • Wildcard IPv6: 2001::* or even 2001::*:abc:*
  • Mixed IPv6 (mapped IPv4): ::ffff:127.0.0.1 (no wildcards allowed in IPv4 part)
  • Not allowed: 10.0.1*.0 or 2001::a*c
• IP Range
  • IPv4: 10.0.0.0-10.1.2.3
  • IPv6: 2001::abc-2001::1:ffff
  • Note: Left side has to be "lower" than the right side
• IP Subnetwork
  • IPv4: 10.0.0.0/16
  • IPv6: 2001::/123
• IP Mask
  • IPv4: 10.0.0.0/255.0.64.0
  • IPv6: 2001:abcd::/ffff:ff8::

The IPMask's toString() method does not automatically simplify e.g. /255.0.0.0 to /8, even though those are equivalent. Since 2.0.0, IPMask comes with a method convertToSubnet() which returns an equivalent IPSubnetwork if possible, otherwise undefined.

Comparison to similar libraries

Here are some well-known similar NPM packages and what features they have that we lack and vice versa. In all cases, feel free to request a new feature if you think it's a good fit for this module.

ip-address

• Supports decoding Teredo information
• Supports reading special properties (multicast prefix, unique local address prefix, is link local, ...)
• Supports parsing IPv6 addresses (and ports) from URLs
• Supports parsing IPv6 ARPA addresses (.ip6.arpa) and scoped (zoned) addresses
• Does not support wildcard IP addresses
• Does not support IP ranges or masks (nor any related methods)
• Does not support getting amount of IP addresses within subnet
• Does not support getting the previous/next of an IP address

ip

• Abandoned for over 4 years (since early 2017)
• Supports fetching local IP address
• Supports NOT/OR operations on/between IP addresses
• Supports regular IPv4/IPv6 addresses
• Supports IPv4 subnets (with subnet properties)
• Does not support wildcard IP addresses or IPv6 subnets
• Does not support IP ranges or masks (nor any related methods)
• Does not support getting the previous/next of an IP address

netmask

• Only supports IPv4 CIDR blocks (with subnet information)
• Supports getting the next subnet of the same size
• Supports checking whether one subnet is part of another
• Does not support anything besides IPv4 subnets

Links

• GitHub: https://github.com/SchoofsKelvin/ip-matching
• NPM: https://www.npmjs.com/package/ip-matching