<?php

class RouteUtil
{
    public static function validateSubnet($subnet)
    {
        $parts = explode("/", $subnet);
        if (count($parts) != 2) {
            return false;
        }
        try {
            $ipv4subnet = new IPv4Subnet($parts[0], $parts[1]);
            return $parts[0] == $ipv4subnet->getFirstAddress();
        } catch (Exception $e) {
            return false;
        }
    }
}