GoLang. Scans a range of IPs for web servers running on ports 80, 8080, and 443.

scan-for-web-servers.go

package main

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

func main() {
	var wg sync.WaitGroup

	// Define the range of IP addresses to scan
	startIP := net.ParseIP("192.168.1.1")
	endIP := net.ParseIP("192.168.1.254")

	// Convert IP addresses to integers for iteration
	start := ipToInt(startIP)
	end := ipToInt(endIP)

	for ip := start; ip <= end; ip++ {
		wg.Add(1)

		go func(ip uint32) {
			defer wg.Done()

			address := intToIP(ip)
			scanPorts(address, []int{80, 8080, 443})
		}(ip)
	}

	wg.Wait()
}

func scanPorts(address string, ports []int) {
	for _, port := range ports {
		target := fmt.Sprintf("%s:%d", address, port)
		conn, err := net.Dial("tcp", target)
		if err == nil {
			defer conn.Close()
			fmt.Printf("Webserver found at %s:%d\n", address, port)
		}
	}
}

func ipToInt(ip net.IP) uint32 {
	ip = ip.To4()
	return (uint32(ip[0]) << 24) | (uint32(ip[1]) << 16) | (uint32(ip[2]) << 8) | uint32(ip[3])
}

func intToIP(ip uint32) string {
	return net.IPv4(byte(ip>>24), byte(ip>>16), byte(ip>>8), byte(ip)).String()
}