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Full Discussion: List of Ports being used.
Operating Systems Solaris List of Ports being used. Post 302411336 by pupp on Thursday 8th of April 2010 09:49:16 AM
Old 04-08-2010
Quote:
a) Is it possible that a port no., not defined in /etc/services, be used by an application.
yes

/etc/services does not necessarily show what ports are open on your specific host. its more a repository for translating port numbers to more meaningful, human readable names... and those that are properly registered with the iana. (NIS maps "services.byname" and the NIS+ table "services" are counterparts).

if you run `netstat -a`, /etc/services will be used to translate a port number to a meaningful name. if you run `netstat -an`, port numbers will not be translated.

you can change /etc/services to whatever you like.
 

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services(4)						     Kernel Interfaces Manual						       services(4)

NAME
services - service name data base DESCRIPTION
The file associates official service names and aliases with the port number and protocol the services use. For each service a single line should be present with the following information: <official service name> <port number/protocol name> <aliases> Port numbers 0 through 1023 are assigned by RFC 1700. This RFC also lists the conventional use of various ports with numbers greater than 1023. Aliases are other names under which a service is known. Library routines such as can be invoked with a service alias instead of the ser- vice official name. For example: In this example, can be invoked with instead of instead of Both produce the same results. Items are separated by any number of blanks (space or tab characters in any combination). The port number and protocol name are considered a single item. A is used to separate the port and protocol (for example, A character indicates the beginning of a comment. Characters from the to the end of the line are not interpreted by routines which search the file. Service names can contain any printable character other than a white space, newline, or comment character. Trailing blanks (spaces or tabs) are allowed at the end of a line. Not all services listed in this file are available on HP-UX. EXAMPLES
AUTHOR
was developed by the University of California, Berkeley. FILES
SEE ALSO
getservent(3N). services(4)
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