IP-sub

A small utility to manipulate prefixes. There are other possible solutions on npm, this was created mostly to prioritize performance.

It implements the following methods.

• getIpAndCidr - if you provide "99.88.77.0/24" it returns ["99.88.77.0", 24]

• isValidPrefix - it returns true/false

• isValidIP - it returns true/false

• sortByPrefix - it is a sorting function for an array or prefixes. It sorts the array based on the entire prefix.

• sortByPrefixLength - it is a sorting function for an array or prefixes. It sorts the array based on the amount of bits of the netmask (from less specific to more specific).

• expandIP - if you provide something like "127/8", you will receive "127.0.0.0/8". If you provide "2001:db8:123::", you will receive "2001:0db8:0123:0000:0000:0000:0000:0000". In case of IPv6, you can also do expandIP("2001:db8:123::", true) to obtain the expanded-shortened version "2001:db8:123:0:0:0:0:0" (without 0 padding).

• isEqualIP - it checks for IP equality, it takes into account expansions and cases. E.g. "2001:db8:123::" is equal to "2001:DB8:123::0"

• isEqualPrefix - same as above, but with prefixes

• getAddressFamily - it returns 4 or 6 (integers)

• toBinary - it returns the binary representation of the IP

• fromBinary - it returns the decimal/hexadecimal representation of a binary IP (essentially, the opposite of the previous function)

• applyNetmask - it applies the netmask. E.g., if you provide "99.88.77.0/24" you will get the binary representation of "99.88.77.0" truncated at 24 bits

• isSubnet - you provide two prefixes and you will get true if the second one is subnet of the first one.

• isSubnetBinary - same as above but directly with binary representation

• cidrToRange - given a prefix in cidr notation, it returns the first and last ip address of the range.