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Reference: Cisco: Internetworking Basics
Several UNIX TCP and UDP port numbers are allocated to well-known services such as finger, SMTP (mail) and HTTP (Web). If you connect to TCP port 13 of a UNIX machine, for example, that supports the daytime service and is not behind a firewall, then it will respond with the current time. The following table lists some of these services. Keep in mind that the complete table contains thousands of entries.
|7||TCP / UDP||echo||Echo Server|
|9||TCP / UDP||discard||Discard Server|
|13||TCP / UDP||daytime||Daytime Server|
|17||TCP||qotd||Quote of the Day|
|18||TCP / UDP||msp||Message Send Protocol|
|19||TCP / UDP||chargen||TTYTST Source Character Generator|
|20||TCP||ftp-data||File Transfer (Data)|
|21||TCP||ftp-data||File Transfer (Control)|
|25||TCP||smtp||Simple Mail Transfer Protocol|
|37||TCP / UDP||time||Time Server|
|53||TCP / UDP||domain||Domain Name Server|
|80||TCP||http||World Wide Web (HTTP)|
|443||TCP||https||World Wide Web (SSL - HTTP)|
|6667||TCP||irc||Internet Relay Chat|
Jeffrey Hunter is an Oracle Certified Professional, Java Development Certified Professional, Author, and an Oracle ACE. Jeff currently works as a Senior Database Administrator for The DBA Zone, Inc. located in Pittsburgh, Pennsylvania. His work includes advanced performance tuning, Java and PL/SQL programming, developing high availability solutions, capacity planning, database security, and physical / logical database design in a UNIX / Linux server environment. Jeff's other interests include mathematical encryption theory, tutoring advanced mathematics, programming language processors (compilers and interpreters) in Java and C, LDAP, writing web-based database administration tools, and of course Linux. He has been a Sr. Database Administrator and Software Engineer for over 20 years and maintains his own website site at: http://www.iDevelopment.info. Jeff graduated from Stanislaus State University in Turlock, California, with a Bachelor's degree in Computer Science and Mathematics.
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