🔒 TCP Socket Reachability

TCP Port Scanner & Connectivity

Probe critical application ports (HTTP, HTTPS, SSH, FTP, MySQL, Postgres, Redis, etc.) on remote hosts.

What Is a Port Scanner?

A TCP port scanner is a diagnostic tool that sends network packets to specific listening port numbers on a target server or IP address to determine if a service is actively listening (open), blocked by a firewall (filtered), or rejecting connections (closed).

1. Web & Proxy Ports

Checks HTTP (80), HTTPS (443), and proxy alt-ports (8080, 8443) to confirm web server availability.

2. Remote Administration

Probes SSH (22), FTP (21), and Telnet (23) to verify remote console accessibility.

3. Database & Caching Services

Audits MySQL (3306), PostgreSQL (5432), and Redis (6379) to detect accidental public exposure.

Frequently Asked Questions

An open port indicates that an application or service on the remote server is actively listening on that port number and successfully established a TCP handshake.

Yes. Database ports such as 3306 (MySQL), 5432 (PostgreSQL), and 6379 (Redis) should never be exposed to the public internet without firewall rules or VPN tunnels, as they are targets for automated brute-force attacks.

A port appears closed if no application is listening on that port. It appears filtered or timed out if an intermediate firewall (such as iptables, AWS Security Groups, or Cloudflare) dropped the TCP SYN packet.

Global Network Tools initiates a non-destructive TCP socket handshake with timeout tracking to confirm socket reachability without sending exploit payloads.

Network & Connectivity Suite