find_ssh.go

package main

import (
	"fmt"
	"net"
	"sync"
	"time"
)

var addresses = make(chan string)
var wg sync.WaitGroup

func main() {
	for i := 0; i < 50; i++ {
		wg.Add(1)
		go trySSH()
	}
	for i := 1; i < 256; i++ {
		addresses <- fmt.Sprintf("192.168.86.%d:22", i)
	}
	close(addresses)
	wg.Wait()
	fmt.Println("done")
}

func trySSH() {
	defer wg.Done()
	for addr := range addresses {
		conn, err := net.DialTimeout("tcp", addr, time.Second*2)
		if err != nil {
			continue
		}
		conn.Close()
		fmt.Println(addr)
	}
}