Acid Scanner Free

Acid Scanner is lightweight network auditing tool (scanner) for home or office use that allows administrators, managers, or common users scan their networks, uncover possible security risks and find unprotected ways to their computers.

This software is freeware and fully portable, no need to install anything. Should work on Windows XP and higher. It allows you to scan a single computer or multiple IP addresses for available shared resources, establish connection via tcp or udp protocol and sends and receive custom data (like telnet but more comfortable). Class C network can be scanned within a few seconds. Discover all network flaws before anyone else does!