Cacher is the code snippet organizer for pro developers

package util

import "net"

func IsPublicIP(ip string) bool {
	var IP net.IP
	IP = net.ParseIP(ip)
	if IP.IsLoopback() || IP.IsLinkLocalMulticast() || IP.IsLinkLocalUnicast() {
		return false
	}

	if ip4 := IP.To4(); ip4 != nil {
		switch true {
		case ip4[0] == 10:
			return false
		case ip4[0] == 172 && ip4[1] >= 16 && ip4[1] <= 31:
			return false
		case ip4[0] == 192 && ip4[1] == 168:
			return false
		default:
			return true
		}
	}

	return false
}