TCP port checker (TCP port tester) is an online TCP client that checks TCP server connectivity and accessibility from the Internet.It can be used to check an arbitrary tcp port on a remote server. TCP port checker attempts to establish a TCP connection. If connection is successful you should be able to see it in the server logs.

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The TCP Port Scan will test an IP Address for common open ports. This technique of testing for listening services is known as a port scan. Try our advanced online port scanner that is able to scan any IP Address or IP range and all 65535 ports. Test Firewall through Port Status

This scan type is also known as "half-open scanning", because it never actually opens a full TCP connection. The port scanner generates a SYN packet. If the target port is open, it will respond with a SYN-ACK packet. The scanner host responds with an RST packet, closing the connection before the handshake is completed.

Port scanner tool can be used to identify available services running on a server, it uses raw IP packets to find out what ports are open on a server or what Operating System is running or to check if a server has firewall enabled etc. Port Scanner - Online Port Scanner Tool 37 rows