range_check
v3.2.0
Published
This is a simple module to validate IP address, check ip address version, check if ip is within a range.
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354,268
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Range Check v3.1.0
This is a simple module to validate IP address, check IP address version, check if IP is within a range.
This started out as range_check
but it does much more than just checking ranges but since it's already got a large amount of downloads (37,115 downloads in the last month as of this writing) I'll keep the name the same even though I kinda want to change it to something better.
Install
npm install range_check
or yarn add range_check
You can then import the functions as needed or require the entire range_check
package depending on your own projects configuration.
IP Functions
Check if IP is valid
console.log(isIP('10.0.1.5')); //returns true or false
Check IP version
Version
console.log(version('10.0.1.5')); //returns 4
console.log(version('2001:4860:8006::62')); //returns 6
console.log(version('foo')); //returns 0 as invalid IP address
isV4
console.log(isV4('10.0.1.5')); //true
console.log(isV4('foo')); //false
console.log(isV4('123::123')); //false
isV6
console.log(isV6('123::123')); //true
console.log(isV6('foo')); //false
console.log(isV6('10.0.1.5')); //false
Range Functions
Check if range is valid
You can use isRange if you want to validate an entire range.
console.log(isRange('2001:db8::/32')); //true
console.log(isRange('10.0.0.0/8')); // true
console.log(isRange('qwerty')); // false
Check if IP is within range
console.log(inRange('10.0.1.5', '10.0.0.0/8')); //returns true
console.log(inRange('192.0.1.5', '10.0.0.0/8')); //returns false
console.log(inRange('2001:db8:1234::1', '2001:db8::/32')); //returns true
You can also give a list of ranges
console.log(inRange('192.168.1.1', ['10.0.0.0/8', '192.0.0.0/8'])); //returns true
Check if IP is private
console.log(isPrivateIP('10.0.0.1')); //returns true
console.log(isPrivateIP('192.168.1.1')); //returns true
console.log(isPrivateIP('172.16.0.1')); //returns true
console.log(isPrivateIP('8.8.8.8')); //returns false
console.log(isPrivateIP('fd00::1')); //returns true (IPv6 ULA)
console.log(isPrivateIP('2001:db8::1')); //returns false
This function checks if an IP address is private. It returns true for:
- IPv4 private ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16)
- IPv4 loopback addresses (127.0.0.0/8)
- IPv6 unique local addresses (fd00::/8)
- IPv6 loopback address (::1)
Check if IP is in range or private
console.log(isIPInRangeOrPrivate('192.168.1.1')); // returns true (private IP)
console.log(isIPInRangeOrPrivate('8.8.8.8')); // returns false (public IP, no range specified)
console.log(isIPInRangeOrPrivate('8.8.8.8', { ranges: '8.8.8.0/24' })); // returns true
console.log(isIPInRangeOrPrivate('10.0.0.1', { allowAnyPrivate: false, ranges: '8.8.8.0/24' })); // returns false
This function checks if an IP address is either within a specified range or is a private IP. It's particularly useful for scenarios where you need to determine if a request is coming from a local server or a specific set of allowed IPs.
Options:
ranges
: A string or array of strings representing IP ranges to check against.allowAnyPrivate
: Boolean to determine if any private IP should be allowed. Defaults to true.
If no options are provided, the function will return true for any private IP and false for public IPs.
Use case example: This function can be used in server configurations to easily allow local calls or calls from specific IP ranges, while blocking others. For instance, it can be used in middleware for setting trace IDs. This allows you to automatically set trace IDs for requests from private networks or specific IP ranges, which can be useful for debugging and tracking requests across microservices in a distributed system.
storeIP
This function is useful to get a consistent IP address such for storing it in a database or when searching in a database after being stored using this. So if a V6 address was sent compacted or not, or if you searched by either version this function would make sure you get a consistent IP address for both versions. Also the possibly of saving a few bytes.
If an V6 addressed is mapped as v4 is given it will convert it to V4, If any other V6 address is given it is abbreviated and plain V4 addresses are left alone. Returns null if a invalid IP
console.log(storeIP('foo')); //null
console.log(storeIP('::ffff:127.0.0.1')); //127.0.0.1
console.log(storeIP('2001:0000:0111:0000:0011:0000:0001:0000')); //2001:0:111:0:11:0:1:0
console.log(storeIP('2001:0001:0000:0001:0000:0000:0000:0000')); //2001:1:0:1::
console.log(storeIP('0000:0000:0000:0000:0000:0000:0000:0000')); //::
console.log(storeIP('0000:0000:0000:0000:0000:0000:0000:0001')); //::1
console.log(storeIP('2041:0000:140F:0000:0000:0000:875B:131B')); //2041:0:140F::875B:131B
console.log(storeIP('2001:0001:0002:0003:0004:0005:0006:0007')); //2001:1:2:3:4:5:6:7
console.log(storeIP('127.0.0.1')); //127.0.0.1
searchIP
Same function as storeIP
, just a clearer name when you are using it for search instead
displayIP
This function is useful for displaying IP addresses, such as after grabbing it back from the database when using storeIP
If an V6 addressed mapped as v4 is given it will convert it to V4, If any other V6 address is given it is normalized into the longer version and plain V4 addresses are left alone. Returns a empty string if a invalid IP
console.log(displayIP(null)); // ''
console.log(displayIP('::ffff:127.0.0.1')); //'127.0.0.1'
console.log(displayIP('2001:0:111:0:11:0:1:0')); //'2001:0000:0111:0000:0011:0000:0001:0000'
console.log(displayIP('2001:1:0:1::')); //'2001:0001:0000:0001:0000:0000:0000:0000'
console.log(displayIP('::')); //'0000:0000:0000:0000:0000:0000:0000:0000'
console.log(displayIP('::1')); //'0000:0000:0000:0000:0000:0000:0000:0001'
console.log(displayIP('2041:0:140F::875B:131B')); //'2041:0000:140F:0000:0000:0000:875B:131B'
console.log(displayIP('2001:1:2:3:4:5:6:7')); //'2001:0001:0002:0003:0004:0005:0006:0007'
console.log(displayIP('127.0.0.1')); //'127.0.0.1'
Contributing
This project is using this starter library bun-lib-starter
Currently to use NPM to publish, must have that installed with Node, along side Bun
cd into the repo
pre-commit install
bun install
bun run test
: Run test suitebun run build
: Generate bundles and typingsbun run format
: Format source files, readme, etc
Dependencies
- ipaddr.js - https://github.com/whitequark/ipaddr.js
- ip6 - https://github.com/elgs/ip6