Save this snippet in a file and run with go run . or go run . google.com

package main

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

func main() {
	addr := "stuff.21zoo.com"
	if len(os.Args) > 1 {
		addr = os.Args[1]
	}
	ips, err := net.LookupIP(addr)
	if err != nil {
		fmt.Printf("net.LookupIP( %s ) err: %s", addr, err)
		return
	}
	for _, ip := range ips {
		fmt.Printf("%s has address %s\n", addr, ip.String())
	}
}

Sample output:

$ go run . stuff.21zoo.com
stuff.21zoo.com has address 104.31.85.183
stuff.21zoo.com has address 104.31.84.183
stuff.21zoo.com has address 2606:4700:30::681f:55b7
stuff.21zoo.com has address 2606:4700:30::681f:54b7