Why can a website scan my internal network and how do I stop it?

Certain malicious download sites run invisible scripts that silently scan ports on your `localhost` (127.0.0.1) or your home network (192.168.x.x), hunting for vulnerabilities in your local infrastructure.

Perimeter hardening for local IPs and localhost

Browser-based port scanning is typically executed via local AJAX requests. AdBlock Network blocks these calls at the source. The extension performs read-only asynchronous requests to multiple independent endpoints to keep your firewall up to date, effectively blocking any outbound web requests directed at your local address at the Address layer.