Nmap Scan Specific Port

In this case, nmap notes that 994 ports are filtered. A specified timeout can be useful when dealing with slow servers. Running a port scan on a network or server reveals which ports are open and listening (receiving information), as well as revealing the presence of security devices such as firewalls that are present between the sender and the target.

Here we’re scanning the port 80 on the provided ip address with the output telling us that it is closed. By default, nmap scans the most common 1,000 ports for each protocol. Test and verify servers, firewalls and network perimeters with nmap online providing the most accurate port status of a systems internet footprint.

To scan using tcp connect (it takes longer, but is more likely to connect):

Nmap uses tcp as the default protocol for the port scan. Nmap scan report for scanme.nmap.org (45.33.32.156) host is up (0.16s latency). Running a port scan on a network or server reveals which ports are open and listening (receiving information), as well as revealing the presence of security devices such as firewalls that are present between the sender and the target. In this case, nmap notes that 994 ports are filtered.