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PORT
NUMBERS
The port numbers are divided into three ranges: the Well Known
Ports, the Registered Ports, and the Dynamic and/or Private
Ports. The Well Known Ports are those from 0 through 1023. The
Registered Ports are those from 1024 through 49151 The Dynamic
and/or Private Ports are those from 49152 through 65535
WELL KNOWN PORT NUMBERS
The Well Known Ports are controlled and assigned by the IANA
and on most systems can only be used by system (or root) processes
or by programs executed by privileged users. Ports are used
in the TCP [RFC793] to name the ends of logical connections
which carry long term conversations. For the purpose of providing
services to unknown callers, a service contact port is defined.
This list specifies the port used by the server process as its
contact port. The contact port is sometimes called the "well-known
port". To the extent possible, these same port assignments are
used with the UDP [RFC768]. The assigned ports use a small portion
of the possible port numbers. For many years the assigned ports
were in the range 0-255. Recently, the range for assigned ports
managed by the IANA has been expanded to the range 0-1023.
Az
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0-199
200-499
500-1023
1024-1499
1500-1699
1700-1999
2000-2499
2500-3299
3300-4999
5000-9999
10000-49151
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