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TCP port checker

 Use your external IP

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. You should only use TCP port checker to verify connection to servers you own or are responsible for. Below are the most commonly used tcp ports.

21FTP (File TransportToLink Protocol) - file storage and retrieval
22SSH, SFTP - secure shell and SSH based FTP
23Telnet - non-secure shell
25SMTP (Simple Mail Transfer Protocol) - sending and receiving email messages
53DNS (Domain Name System) - mapping from hostname to ip and vice versa
80HTTP (HyperText Transfer Protocol) - main protocol of world wide web
110POP (Post Office Protocol) - mail retrieval protocol
123NTP (Network Time Protcol) - time synchronization protocol
143IMAP (Internet Message Access Protocol) - mail retrieval protocol
156SQL - relational database
161SNMP (Simple Network Management Protocol) - network configuration protocol
179BGP (Border Gateway Protocol) - routing configuration protocol
389LDAP (Lightweight Directory Access Protocol) - distributed directory
443HTTPS - secure HTTP
636LDAPS - secure LDAP
3306MySQL database
3389RDP - Remote Desktop

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