Port Scanning Methods

List of Port Scanning Methods:

1. TCP
2. UDP
3. NULL
4. FIN
5. XMAS
6. ACK
7. IDLE

NULL

Does not set any bits (TCP flag header is 0).

FIN

Sets just the TCP FIN bit.

XMAS

Sets the FIN, PSH, and URG flags, lighting the packet up like a Christmas tree.

ACK

This scan is different than the others discussed so far in that it never determines open (or even open|filtered) ports.

External References

1. “Port Scanning Techniques and Algorithms“, Gordon “Fyodor” Lyon, nmap.org
2. “CEH v10 Course: Module 3”, EC-Council