Port Scanner Scans the ports against an IP address or a domain. A port in networking is a term used to identify the service to which an incoming packet is to be forwarded. Most commonly used port types are TCP and UDP Ports.
A Port in terms of computer networking is used to define an endpoint for networking communication. At the software level, we can identify it as a logical construct used to identify a network service or a specific process. The incoming packet's headers are used to specify which service should this packet be forwarded. A router or hardware firewall can be instructed to block any specific port or a range of ports, which disallows every incoming or outgoing request on specified ports. With every network request, the system specifies the port along with an IP address and a communication protocol to complete the destination network address of a message. Ports provide a multiplex service for communication of multiple requests on the same network address, in this way more than one connection can be established using a single network on the same network service. There are two commonly used port types which are TCP (Transmission Control Protocol) and UDP (User Datagram Protocol).
Port Scanner Tool checks the most common ports used by Windows services, Ubuntu servers, favorite games, or other software. We have a pre-defined list of all available used ports, you have to enter any domain or IP address, and this tool checks which ports are active and accepting requests on your IP or domain. You can also define custom ports for checking if they are open for external requests. Checking open ports is also useful to avoid any external attacks on your IP. Mostly the attackers search a wide range of IPs and request them on different ports to check vulnerability to attack. So it's better only to keep those ports open which you think are secured by your Software or Hardware Firewall or an Anti-virus program.