Port Check, Check Open Ports Online

What is Port Checker ?

Port scanning is the process of scanning a computer or network device for open ports by sending packets to those ports. Each service running on a computer listens on one or more ports, waiting for external connection requests.
Through port scanning, open ports and their corresponding services can be identified, helping administrators identify security-related issues such as vulnerabilities, weak passwords, or other problems that may lead to network attacks. Port scanning can also be used to test firewall configurations for safety and discover network-related performance issues.

What are some commonly used port numbers?

20: FTP data transfer port

21: FTP control port

22:SSH remote login protocol

23: Telnet terminal emulation protocol

25: SMTP email transfer protocol

53:DNS domain name system service

67:DHCP client

68:DHCP server

80: HTTP request and response protocol

110: POP3 email retrieval protocol

119: NNTP newsgroup transfer protocol

123: NTP network time protocol

143: IMAP4 email access protocol

161: SNMP simple network management protocol

443: HTTPS secure HTTP protocol

465: SMTPS encrypted SMTP protocol

514: Syslog log transfer protocol

873: rsync remote file synchronization protocol

993: IMAPS encrypted IMAP protocol

995: POP3S encrypted POP3 protocol