Service names and port numbers are used to distinguish between different
services that run over transport protocols such as TCP, UDP, DCCP, and
SCTP.
Service names are assigned on a first-come, first-served process, as
documented in [RFC952].
Port numbers are assigned in various ways, based on three ranges: System
Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Private
Ports (49152-65535); the difference uses of these ranges is described in
[RFC6335]. System Ports are assigned by IETF
process for standards-track protocols, as per [RFC1340]. User Ports
are assigned by IANA using the "Expert Review" process, as per
[RFC5226]. Dynamic Ports are not assigned.
The registration procedures for service names and port numbers are
described in [RFC6335].
Assigned ports both System and User ports SHOULD NOT be used without
or prior to IANA registration.
A questo link potete trovare un elenco "ufficiale" riguardante le porte utilizzate sui vari protocolli , aggiornato al 21/09/2011 : http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xml
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