network tools/scanning/TCP Port Scanner

TCP Port Scanner

Scan TCP ports to identify open services and potential entry points on target systems

network tools
Risk: Medium
Single Port Scanning
Common Ports Scanning
TCP Handshake Detection
Service Identification
#tcp
#port
#scanner
#network
#pentest
#reconnaissance

How TCP Port Scanning Works

  1. 1The scanner sends a TCP SYN packet to the target IP and port
  2. 2If the port is open, the target responds with SYN/ACK
  3. 3If the port is closed, the target responds with RST
  4. 4If filtered/blocked, typically no response is received (timeout)
Client
Server
SYN
SYN-ACK (open) / RST (closed)
ACK (for open ports)

TCP Port Scanner

Legal Disclaimer

This tool is intended solely for educational purposes and authorized security testing. Use it only on systems you own or those for which you have explicit, written permission to test. Unauthorized scanning of networks or systems without consent may be illegal and is strictly prohibited. Always conduct scans responsibly and in accordance with all applicable laws, regulations, and ethical guidelines.

Authorization Required

Only use this tool on systems you own or have explicit written permission to test. Unauthorized scanning or testing is illegal and may result in criminal charges.