ipaddress-go

Go library for handling IP addresses and subnets, both IPv4 and IPv6

IP address and network manipulation, CIDR, address and subnet operations, iterations, containment checks, IP to CIDR block lookup, longest prefix match, subnetting, spanning, merging, ranges, and address tries, with polymorphic code

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Version	Notes
1.2.1	Requires Go 1.12 or higher
1.4.1	Requires Go 1.13 or higher
1.5.5	Requires Go 1.18 or higher

In your go.mod file:
require github.com/seancfoley/ipaddress-go v1.5.5

In your source file:
import "github.com/seancfoley/ipaddress-go/ipaddr"

Packaged as a Linux Fedora rpm and as a Linux Debian

Also available as a Java library from the IPAddress repository

Getting Started

starting with address or subnet strings

import "github.com/seancfoley/ipaddress-go/ipaddr"

ipv6AddrStr := ipaddr.NewIPAddressString("a:b:c:d::a:b/64")
if ipAddr, err := ipv6AddrStr.ToAddress(); err != nil {
	// err.Error() has validation error
} else {
	// use the address
}

...or avoid errors, checking for nil:

str := ipaddr.NewIPAddressString("a:b:c:d:e-f:f:1.2-3.3.4/64")
addr := str.GetAddress()
if addr != nil {
	// use address
}

starting with host name strings

hostStr := "[::1]"

host := ipaddr.NewHostName(hostStr)
err := host.Validate()
if err == nil {
	if host.IsAddress() {
		fmt.Println("address: " + host.AsAddress().String())
	} else {
		fmt.Println("host name: " + host.String())
	}
	// use host
} else {
	fmt.Println(err.Error())
}