Port Scanner

Scan for open ports on an IP or domain. Check network security and detect running services.

Target Host

Example:

Scan Type

Security Notice: Only scan networks you own or have explicit permission to test. Browser-based scanning has limitations compared to native tools (Nmap) - it can only reliably detect HTTP/HTTPS services due to security sandbox restrictions.

Frequently Asked Questions

What is a port scanner and how does it work?

A port scanner is a network tool that checks which ports on a server or IP address are open and listening for connections. Our online port scanner attempts to establish connections to specific ports using browser-based technologies to determine if services are accessible.

Is it legal to scan ports on any IP address?

Port scanning falls into a legal gray area. Scanning your own networks or servers you have explicit permission to test is legal. However, scanning third-party systems without authorization may violate terms of service or local laws.

What are the most commonly scanned ports?

The most commonly scanned ports include: Port 80 (HTTP), Port 443 (HTTPS), Port 22 (SSH), Port 21 (FTP), Port 25 (SMTP), Port 53 (DNS), Port 3306 (MySQL), and Port 3389 (RDP).

Can this tool detect service versions and OS?

Due to browser security restrictions, this web-based scanner provides basic port status detection. Advanced features like OS fingerprinting and service version detection require raw socket access available only in native applications like Nmap.

What does TCP SYN scanning mean?

TCP SYN scan is a stealthy scanning technique that sends SYN packets to initiate connections but doesn't complete the handshake. Note: This technique requires raw socket privileges and cannot be performed from within a web browser.