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ip-num is a TypeScript library for working with IPv4, IPv6 and ASN numbers. It provides representations of these internet protocol numbers with the ability to perform various operations like parsing, validating etc. on them.

ip-num can be used with both TypeScript and vanila JavaScript. It also support both usage within a browser environment as well as Node.Js environment.

ip-num makes use of the BigInteger.js library to represents numeric values. This is due to the fact that numeric values when dealing with IP numbers can exceed the value that can safely be represented natively within JavaScript without loosing precisions ie numbers greater than Number.MAX_SAFE_INTEGER

ip-num's source can be found on GitHub

You can have a play at ip-num's API via the JsBin at http://bit.ly/ipnum-playground



If you want to use ip-num from within a Node.js environment, you can install it via npm.

npm install ip-num

ip-num is tested against version 7 - and upwards - of NodeJs.


If you are using a browser, you can include ip-num by linking to it or download it from GitHub

<script src="https://ip-num.github.io/ip-num/ip-num.js"></script>

The source maps can be found at

Previous releases can be seen at [https://github.com/ip-num/ip-num/releases](https://github.com/ip-num/ip-num/releases)


The functionality `ip-num` exposes can be grouped into 2 broad categories:
* Modules representing ASN, IPv4, and IPv6 internet protocol numbers
* Utilities and Validator 

How you get access to the above, depends on the module loading mechanism being used. The examples below will show how
 to access `ip-num` using ES module mechanism with TypeScript in Node.js, using CommonJs module mechanism with 
 JavaScript in Node.Js, and by including `ip-num` via a script tag with JavaScript in the browser.

### ES module with TypeScript

Import what you need from `ip-num` and use away

import { Asn } from "ip-num/Asn"; import { IPv4 } from "ip-num/IPv4"; import { IPv6 } from "ip-num/IPv6";

You can then make use of the imported module in your TypeScript code

let asn = new Asn(65546); asn.toBinaryString() //10000000000001010

let ipv4 = new IPv4(""); ipv4.toBinaryString() //01001010011111010010101101100011

let ipv6 = new IPv6("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"); ipv6.toBinaryString() //11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

### CommonJs with JavaScript

All external modules in `ip-num` are exported and made available via the global _ip-num_ module. So you can `require
('ip-num')` and then access the module you want to use in your application, or access the module in one go, while 
requiring; as shown below:

const Asn = require("ip-num").Asn; const IPv4 = require("ip-num").IPv4; const IPv6 = require("ip-num").IPv6;

The imported module can then be used:

let asn = new Asn(65546); asn.toBinaryString() //10000000000001010

let ipv4 = new IPv4(""); ipv4.toBinaryString() //01001010011111010010101101100011

let ipv6 = new IPv6("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"); ipv6.toBinaryString() //11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

### Via Script tag with JavaScript

Including the `ip-num` library via the script tag in the browser exposes `ipnum` variable from which you can access 
the modules exposes by the library.

........ let asn = new ipnum.Asn(65546); console.log(asn.toBinaryString()); //10000000000001010

let ipv4 = new ipnum.IPv4("") console.log(ipv4.toBinaryString()); //01001010011111010010101101100011

let ipv6 = new ipnum.IPv6("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"); console.log(ipv6.toBinaryString()); //11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

Documentation can be found at [https://ip-num.github.io/ip-num/](https://ip-num.github.io/ip-num/)

Find below, some example of the usage of `ip-num`. For a more comprehensive overview of the API, please refer to the [documentation](https://ip-num.github.io/ip-num/).

`ip-num` makes use of the [BigInteger.js](https://github.com/peterolson/BigInteger.js/) library to represents numeric values. This is due to the fact that numeric 
values that needs to be worked with when dealing with IP numbers can exceed the numeric value that can be safely represented natively within JavaScript without loosing precisions ie numbers greater than 

### ASN

import { Asn } from "ip-num/Asn"; .......... // creating let asA = Asn.fromNumber(1234) // using the fromNumber factory method to create an instance from number let asB Asn.fromString("AS1234") // using the fromString factory method to create an instance from string let asC = Asn.fromString("1234") // string without the "AS" prefix is also supported let asD = Asn.fromString("1.10") // string in asdot+ format is also supported let asE = Asn.fromBinaryString('1111') // using the fromBinaryString to create an instance from binary string

// converting between different ASN string representations Asn.fromNumber(65526).toASDotPlus() // will give "0.65526" Asn.fromNumber(65546).toASDot() // will give "1.10" Asn.fromNumber(2).toBinaryString() // will give 10

// check if previous and next values exist, getting previous and next values Asn.fromNumber(Math.pow(2, 32) - 1).hasNext() // false Asn.fromNumber(2).hasNext() // true Asn.fromNumber(0).hasPrevious() // false Asn.fromNumber(2).hasPrevious() // true

See the [ASN documentation](https://ip-num.github.io/ip-num/classes/_asn_.asn.html) for more information

### IPv4

import { IPv4 } from "ip-num/IPv4";

// creating let firstIPv4 = new IPv4("") // Creating an instance using the constructor let secondIPv4 = IPv4.fromBigInteger(bigInt("1876843053")) // Using the fromBigInteger convenience method let thirdIPv4 = IPv4.fromDecimalDottedString("") // Using the fromDecimalDottedString convenience method let fourthIPv4 = IPv4.fromBinaryString("01001010011111010010101101100011") // using the fromBinaryString convenience method

// converting an IPv4 instance to binary string representation firstIPv4.toBinaryString() // will be 01001010011111010010101101100011

// comparing IPV4 firstIPv4.isEquals(thirdIPv4) // false firstIPv4.isLessThan(thirdIPv4) // true firstIPv4.isGreaterThan(thirdIPv4) // false

See the [IPv4 documentation](https://ip-num.github.io/ip-num/classes/_ipv4_.ipv4.html) for more information

### IPv6

import { IPv6 } from "ip-num/IPv6";

// creating let firstIPv6 = new IPv6("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff") // Creating an instance using the constructor let secondIPv6 = IPv6.fromBigInteger(bigInt("100")) // Using the fromBigInteger convenience method let thirdIPv6 = IPv6.fromHexadecimalString(""::") // Using the fromDecimalDottedString convenience method. Not abbreviated representation of IPv6 string is supported let fourthIPv6 = IPv6.fromBinaryString("01001010011111010010101101100011") // using the fromBinaryString convenience method

// converting an IPv6 instance to binary string representation firstIPv6.toBinaryString() // will be 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

// comparing IPV6 firstIPv6.isEquals(thirdIPv6) // false firstIPv6.isLessThan(thirdIPv6) // false firstIPv6.isGreaterThan(thirdIPv6) // true

See the [IPv6 documentation](https://ip-num.github.io/ip-num/classes/_ipv6_.ipv6.html) for more information

### IPv4 Ranges

import {IPv4Range} from "ip-num/IPv4Range";

// creating an IPv4 range from CIDR notation let ipv4Range = IPv4Range.fromCidr("");

// get first and last IPv4 number in the range ipv4Range.getFirst().toString() // gives ipv4Range.getLast().toString() // gives

// getting number of IPv4 numbers in the range ipv4Range.getSize() // Returns 256

// splitting ranges ipv4Range.split()[0].toCidrString() // returns ipv4Range.split()[1].toCidrString() // returns

See the [IPv4Range documentation](https://ip-num.github.io/ip-num/classes/_ipv4range_.ipv4range.html) for more information

### IPv6 Ranges

import {IPv6Range} from "ip-num/IPv6Range";

// creating an IPv6 range from CIDR notation let ipv6Range = IPv6Range.fromCidr("2001:db8::/33");

// get first and last IPv6 number in the range ipv6Range.getFirst().toString() // gives 2001:db8:0:0:0:0:0:0 ipv6Range.getLast().toString() // gives 2001:db8:7fff:ffff:ffff:ffff:ffff:ffff

// getting number of IPv6 numbers in the range ipv6Range.getSize() // Returns 39614081257132168796771975168

// splitting ranges ipv6Range.split()[0].toCidrString() // returns 2001:db8:0:0:0:0:0:0/34 ipv6Range.split()[1].toCidrString() // returns 2001:db8:4000:0:0:0:0:0/34

See the [IPv6Range documentation](https://ip-num.github.io/ip-num/classes/_ipv6range_.ipv6range.html) for more information

### IPNumber and IPRange interfaces
When working in TypeScript, you have the ability to abstract ASN, IPv4 and IPv6 as an IPNumber, and IPv4Range and 
IPv6Range as IPRange

// representing ASN, IPv4 and IPv6 with the IPNumber interface let ipNumbers: IPNumber[] = []; ipNumbers.push(new Asn("200")); ipNumbers.push(new IPv4("")); ipNumbers.push(new IPv6("2001:800:0:0:0:0:0:2002"))

// console logs AS200 2001:800:0:0:0:0:0:2002 ipNumbers.forEach(ip => { console.log(ip.toString()); });

// representing IPv4Range and IPv6Range with the IPRange interface let ipRanges: IPRange[] = []; ipRanges.push(IPv4Range.fromCidr("")); ipRanges.push(IPv6Range.fromCidr("2001:db8::/33"));

// console logs 2001:db8:0:0:0:0:0:0/33 ipRanges.forEach(iprange => { console.log(iprange.toCidrString()); });

See the [IPNumber documentation](https://ip-num.github.io/ip-num/interfaces/_interface_ipnumber_.ipnumber.html) for more information
See the [IPRange documentation](https://ip-num.github.io/ip-num/interfaces/_interface_iprange_.iprange.html) for more information

### IPv4Subnet and IPv6Subnet

IPv4Subnet and IPv6Subnet are used to represents subnets in IPv4 and IPv6 

Subnets are in all respects IP numbers with the only restriction that they must contain contiguous on bits (1's) 
followed by contiguous off bits (0's). This means IPv4Subnet and IPv6Subnet can perform all the operations available 
on IPv4 and IPv6. The only difference is that the invariant required for a subnet is enforced in the contructor of 
IPv4Subnet and IPv6Subnet. For example:

The following code will throw an exception:

import {IPv4Subnet} from 'ip-num/IPv4Subnet' import {IPv4Subnet} from 'ip-num/IPv4Subnet'

let ipv4Subnet = new IPv4Subnet(""); let ipv6Subnet = new IPv6Subnet("3ffe:1900:4545:0003:0200:f8ff:fe21:67cf");

While the following code works fine:

import {IPv4Subnet} from 'ip-num/Subnet' import {IPv6Subnet} from 'ip-num/Subnet'

let iPv4Subnet = new IPv4Subnet(""); let iPv6Subnet = new IPv6Subnet("ffff:ffff:ffff:ffff:ffff:ffff:0:0");

See the [Subnet documentation](https://ip-num.github.io/ip-num/modules/_subnet_.html) for more information

### IPv4-Mapped IPv6 Address Support
IPv4-Mapped IPv6 Address IPv6 allows embedding an IPv4 address within an IPv6 address. See [IPv6 Addresses with Embedded IPv4 Addresses](https://tools.ietf.org/html/rfc4291#section-2.5.5)

`ip-num` offers various ways to create an IPv4-Mapped IPv6 Address:

##### Converting from an existing IPv4

import { IPv4 } from "ip-num/IPv4";

let ipv4 = new IPv4("") ipv4.toIPv4MappedIPv6().toString() // produces ::ffff:4a7d:2b63

##### From an existing IPv4 using convenience method on IPv6

import { IPv6 } from "ip-num/IPv6";

let ipv6 = IPv6.fromIPv4(new IPv4("")) ipv6.toString() // produces ::ffff:4a7d:2b63

##### From dot-decimal notation using convenience method on IPv6

import { IPv6 } from "ip-num/IPv6";

let ipv6 = IPv6.fromIPv4DotDecimalString("") ipv6.toString() // produces ::ffff:4a7d:2b63

### Validation and Utilities

Various validation are exposed via the `Validator` module.  `ip-num` also provide various utility operations. These 
utility operations can be found in `BinaryUtils`, `IPv6Utils`, and `HexadecimalUtils`.

For example to expand and collapse IPv6 numbers:

import {IPv6Utils} from 'ip-num/IPv6Utils'

// expanding IPv6Utils.expandIPv6Number("::") // Expands to 0000:0000:0000:0000:0000:0000:0000:0000 IPv6Utils.expandIPv6Number("FF01::101")// Expands to FF01:0000:0000:0000:0000:0000:0000:0101 // collapsing IPv6Utils.collapseIPv6Number("0000:0000:0000:0000:0000:0000:0000:0000") // Collapses to :: IPv6Utils.collapseIPv6Number("FF01:0:0:0:0:0:0:101") // Collapses to FF01::101

To check if a given string is valid cidr notation:

import {Validator} from 'ip-num/Validator'

let result = Validator.isValidIPv4CidrNotation("123.234.334.23") // result => [false, ["Cidr notation should be in the form [ip number]/[range]"]] let result = Validator.isValidIPv4CidrNotation("") // result => [true, []] ``` See the Validator documentation for more information See the BinaryUtils documentation for more information See the IPv6Utils documentation for more information See the HexadecimalUtils documentation for more information


The ip-num library is released under the MIT license


To discuss a new feature or ask a question, open an issue. Find the issue tracker here

Found a bug and you want to provide a fix for it? Then feel free to submit a pull request. It will be appreciated if the changes made are backed with tests.

Change log

  • Fixed isValidIPv4String() incorrectly returns true for some invalid addresses. Issue #9
  • Improved Validator.isValidIPv6String and added test coverage. Issue #10
  • Added convenient methods for creating IPv4 (IPv4.fromBinaryString) and IPv6 (IPv6.fromBinaryString) from binary string Issue #11
  • Added convenient methods for creating ASN (ASN.fromBinaryString) Issue #13
  • Prepend with "::" if toString value for IPv6 has leading zeros. Issue #12
  • Implemented support for IPv4-Mapped IPv6 Address. Issue #3

Version 1.1.0 was Unpublished.

  • Renamed Subnet to SubnetMask Issue #1
  • Fixed the throwing of invalid integer: NaN when invalid IPv4 and IPv6 strings are passed to Validator .isValidIPv4String and Validator.isValidIPv6String validators. Fixed by saiyeek Issue #5
  • Fixed Validator.isValidIPv4CidrNotation improper validation of IPv4 CIDR Issue #6

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