Use this TCP port scan tool to check what services (apache, mail, ssh, ftp, mysql, telnet, dns) are running on your server, test if your firewall is working correctly, view open TCP ports.

6 days ago · Use our Nmap-powered port scanner to find open TCP or UDP ports and services. Free online port checker to map your network perimeter and attack surface.

Online TCP Port Scan to quickly determine the status of an Internet facing service or firewall. Uses the powerful Nmap with an API available for testing.

Jul 23, 2025 · This command runs Nmap in TCP SYN scan type (-sS) and scans the given IP address range for active hosts and services. Please refer to the article Port Scanning to learn more about it.

Oct 6, 2023 · One of the more common and popular port scanning techniques is the TCP half-open port scan, sometimes referred to as an SYN scan. It’s a fast and sneaky scan that tries to find potential …

May 22, 2023 · Take control of your network security with PortScanner - the ultimate TCP and UDP scanning solution. Safeguard your network, detect vulnerabilities, and fortify your defenses against …

A port scanner sends a UDP or TCP network packet that asks the port about its status. The results will uncover network or server status, which can be one of the following: open, closed and filtered.

TCP scanning is a fundamental technique in network security and reconnaissance, used to discover open ports and understand network service configurations. At its core, TCP scanning involves …

Advanced Port Scanner is a free network scanner allowing you to quickly find open ports on network computers and retrieve versions of programs running on the detected ports.

Jan 18, 2023 · A TCP connect scan establishes a complete connection to the target host by completing a TCP three-way handshake. After the scan is complete, Nmap terminates the connection.