What Is Port Scanning?

A free open port check tool used to detect open ports on your connection. Test if port forwarding is correctly setup or if your port is being blocked by your firewall or ISP.

Simply leverage our port checker, designed to identify open and closed ports. It combines traditional TCP and UDP scanning techniques to ensure 100% accurate results. This helps you understand your network's connectivity status and flag potential vuln

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.

Free online port checker tool to test if ports are open on your device or remote servers. Find your IP address and more with our network tools.

端口掃描器乃一項免費實用工具，能便利地協助您偵測設備上的開放端口。 該工具能自動識別您的IP地址，並檢視您設備上開放且未受保護的端口，這些端口可能成為黑客、病毒與特洛伊木馬侵入您系統的途徑。 何謂端口掃描器？ 開放端口掃描器運用nmap技術，對您的設備進行檢測，以識別可能存在安全隱患的開放系統端口。 其功能包括： 迅速識別處於啟動狀態，預備接收或傳送資料的系統端口。 透過監控開放端口的活動，您能瞭解哪些應用程式和服務正在您的系統中運作。 端口掃描乃一項便捷的安全防護，助您抵禦潛在的駭客威脅。 何謂網路端口

Scan your network for open ports with this free port scanner tool. It helps determine whether those open ports need to be closed for more network security and fewer vulnerabilities.

Port checker is a utility used to identify your external IP address and detect open ports on your connection. This tool is useful for finding out if your port forwarding is setup correctly or if your server applications are being blocked by a firewall.