lookupipv6.go

lookupipv6.go

package main

import (
	"fmt"
	"net"
	"os"
)

// LookupIPv6 looks up host using the local resolver. It returns a slice of that host's IPv6 addresses
func LookupIPv6(host string) ([]net.IP, error) {
	addrs, err := net.LookupIP(host)
	if err != nil {
		return nil, err
	}
	var ipv6addrs []net.IP
	for _, addr := range addrs {
		if addr.To4() == nil {
			ipv6addrs = append(ipv6addrs, addr)
		}
	}
	return ipv6addrs, nil
}

func main() {
	host := os.Args[1]
	ips, err := LookupIPv6(host)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	for _, ip := range ips {
		fmt.Printf("IPv6: %s\n", ip.String())
	}

}