What are ports? A port is a name given to an endpoint of a logical connection. Port numbers identify types of ports. For Example, on the Internet, port 80 (HTTP) is used to connect computers for the purpose of showing and viewing web pages. So, when you type in your domaian name (http://domainname.com) the page is shown by connecting your computer to a webserver via port 80.
|
| 7 | Echo | Echo
server - returns what is sent |
| 9 | Discard | A
sink - like /dev/null |
| 15 | Netstat | A
variant of systat - for remote management |
| 21 | FTP | File
Transfer Protocol |
| 23 | TELNET | Allows remote logins |
| 25 | SMTP | Simple
Mail Transfer Protocol |
| 53 | DNS | Domain
Name Server |
| 69 | TFTP | A very
simple protocol used to transfer files |
| 70 | gopher | Precursor to HTTP |
| 79 | finger | Protocol provides an interface to a remote user information program |
| 80 | HTTP | Hyper
Text Transfer Protocol |
| 87 | LINK | Talk/Chat style protocol |
| 110 | POP3 | Post
Office Protocol |
| 119 | NNTP | Network News Transport Protocol |
| 143 | IMAP | Mail
protocol used by Sendmail, Qmail, etc. |
| 161 | SNMP | Simple Network Management Protocol |
| 162 | SNMP | Trap
|
| 443 | HTTPS | Encrypted form of HTTP - default port for encrypted transmissions |
| 513 | Login | who/rlogin - sends out broadcast giving list of who is logged in |
| 514 | rsh | (tcp)
Port for remote shell connection |
| 514 | SYSLOG | (udp) System log facility |
| 515 | printer | Common port of unix printers |
| 515 | syslog | (udp) alternate port to 514 for syslog messages |
| 5190 | ICQ | Chat
program |
