Most ISPs filter spoofed IP addresses nowadays[1]. Even if your ISP doesn't prevent it, NAT might. You wouldn't get a whole lot of responses this way, and there

Most ISPs filter spoofed IP addresses nowadays[1]. Even if your ISP doesn't prevent it, NAT might. You wouldn't get a whole lot of responses this way, and there'd be a strong bias because of regional differences w.r.t. filtering. [1]: https://spoofer.caida.org/summary.php https://spoofer.caida.org/summary.php