Port Scan Tool
Port Scan PRO
Single-node port scanning with TCP SYN/Connect methods, service fingerprint detection, quick port presets (Web/SSH/DB/Mail), up to 10 ports per scan, detailed error diagnostics, and report image export.
| Port | Service | Status | Latency / Error |
|---|
About Online Port Scan and Connectivity Diagnostics
This tool allows you to perform precise port probing from a specified edge node (Agent) to your server. Extremely effective for troubleshooting port access issues caused by firewall blocking, cloud security group misconfiguration, or routing blackholes.
- Single IP Restriction: To prevent malicious probing and resource abuse, only single public IPv4 or IPv6 addresses are allowed. CIDR ranges and domain resolution are not supported. Private network addresses are strictly blocked at the infrastructure level.
- Scan Rate Limit: To ensure fair use of public resources, unauthenticated users are limited to 10 scans per hour.
- Service Fingerprint Detection: When enabled, the system will attempt to guess the specific service and version running on open ports (e.g., nginx/1.18.0, OpenSSH 8.2p1).
- Detailed Error Output: When enabled, you can clearly see the specific network blocking reason (e.g., TCP RST from firewall, or Timeout due to routing drop).
- Status Explanation: Open means server is listening and accepting connections; Closed means server explicitly refused connection (RST received); Filtered means request was dropped by firewall with no response (timeout).
What is the difference between TCP SYN and TCP Connect scan?
TCP SYN (half-open) scan sends SYN packets and analyzes responses without completing handshake. TCP Connect scan establishes full connections. SYN scan is faster and stealthier.
What does Filtered status mean?
Filtered means the port is protected by a firewall that drops packets without response, making it impossible to determine if a service is running.
Why is service fingerprint detection useful?
Service fingerprint detection identifies the actual service and version running on an open port, helping you understand what applications are exposed.
What ports should I scan first?
Common ports include 80/443 (HTTP/HTTPS), 22 (SSH), 3389 (RDP), 3306 (MySQL). Use quick presets for efficient scanning.
