Open Ports grading is based on the status of the port. Use the Nmap and telnet commands to check IP addresses and ports and see:
- If a port is open. A “filtered” port implies that it’s closed.
- Services running on the port.
We cannot confirm if UDP ports are truly closed since they do not require a handshake. Therefore, the finding cannot be updated and will have to go through its entire lifetime. However, if a UDP call returns “open|filtered,” then it is likely (but not always!) closed.
Commands requiring specific asset data from your finding to be inserted (variables) are indicated by the bold text.
nmap -Pn -p port IP Address
-u flag is required only when testing UDP ports.
See available options for connecting over a specific IP or port.
telnet IP address port