Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Community Member

port number assignments

Hi all

can anyone explain the below, and what each one is used for, i hardly see dynamic ports used on my pc, I thought any initiated connection would used dymanic, but according to the iana, it doesnt start until 49152

please help

Carl

registered

well known

dymanic

2 REPLIES
Bronze

Re: port number assignments

According to IANA....

WELL KNOWN PORT NUMBERS

The Well Known Ports are 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 range for assigned ports managed by the IANA is 0-1023.

REGISTERED PORT NUMBERS

The Registered Ports are listed by the IANA and on most systems can be

used by ordinary user processes or programs executed by ordinary

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 IANA registers uses of these ports as a convenience to the

community.

To the extent possible, these same port assignments are used with the

UDP [RFC768].

The Registered Ports are in the range 1024-49151.

DYNAMIC AND/OR PRIVATE PORTS

The Dynamic and/or Private Ports are those from 49152 through 65535.

Bronze

Re: port number assignments

netstat -an is a good command to show utilized ports or sniffing your own network traffic to the internet would be a good start.

258
Views
0
Helpful
2
Replies
CreatePlease to create content