dnstest-1.go

package main

import (
	"context"
	"fmt"
	"net"
	"os"
	"time"
)

func main() {
	resolver := &net.Resolver{
		PreferGo: true,
		Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
			dialer := net.Dialer{Timeout: time.Duration(10 * time.Second)}
			return dialer.DialContext(ctx, network, address)
		},
	}
	started := time.Now()
	resolver.LookupIPAddr(context.Background(), os.Args[1])
	fmt.Printf("Query took: %s", time.Since(started))
}

output

➜  dnstest go build -o main main.go
➜  dnstest set -lx GODEBUG netdns=9
➜  dnstest ./main google.com
go package net: using cgo DNS resolver
go package net: hostLookupOrder(google.com) = files,dns
Query took: 5.029126188s⏎                                                                                                                                                                                    ➜  dnstest dig google.com

; <<>> DiG 9.10.6 <<>> google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16595
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1280
;; QUESTION SECTION:
;google.com.                    IN      A

;; ANSWER SECTION:
google.com.             155     IN      A       172.217.4.46

;; Query time: 12 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Sun Oct 31 16:18:57 CDT 2021
;; MSG SIZE  rcvd: 55