Audit network configurations and secure ports with our comprehensive TCP/UDP Port Security Directory. Instantly inspect registered service designations, protocol properties (TCP, UDP, SCTP), security threat classifications, and recommended firewall mitigations for standard internet services (including SSH, HTTP, MySQL, and DNS) to build resilient systems.
Ports are divided into three groups: Well-Known Ports (0-1023) reserved for core infrastructure (like SSH, SMTP, HTTP); Registered Ports (1024-49151) registered for proprietary developer services (like PostgreSQL, Redis, Kubernetes); and Dynamic/Private Ports (49152-65535) used for temporary, outbound ephemeral connections.
An open port means a network service application is actively listening for incoming packets on that port. If that service is misconfigured, unpatched, or vulnerable, hackers can exploit it to compromise the system, which is why firewalls should explicitly block unrequested inbound ports.
No. This is an analytical and educational directory of port characteristics. Web browsers operate inside strict security sandboxes and cannot initiate raw TCP/UDP port-scanning handshakes (such as SYN/ACK stealth sweeps) due to CORS and native networking restrictions.