Re: Which app owns an open listening socket?
Re: Which app owns an open listening socket?
- Subject: Re: Which app owns an open listening socket?
- From: Josh Graessley <email@hidden>
- Date: Tue, 30 Apr 2002 19:23:02 -0700
On 4/30/02 6:54 PM, "Duane Murphy" <email@hidden> wrote:
>
--- At Tue, 30 Apr 2002 15:14:05 -0400, Avi Drissman wrote:
>
>
> (BTW, does anyone know of anyone using TCP port 18769?)
>
>
AFAIK any port above 1024 is a dynamic port. They are not reserved and
>
are used when you open a port and dont care what the socket is. Picking a
>
socket in the dynamic range and assuming you can always get it is fraught
>
with problems.
That's not true. The dynamic ports are pulled out of the range from 49152
through 65535. If you're going to use a static port number, you should
register with IANA.
From various locations on IANA's web site (www.iana.org):
"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"
"The System (Well-Known) Ports are those from 0 through 1023. (See
http://www.iana.org/assignments/port-numbers.)
In order to obtain a system port number you need to have a specification
documented in the form of an RFC, an Internet-Draft that is intended to be
published as an RFC, or a permanently and readily available reference that
the IETF could standardize if it chose to."
"The User (Registered) Ports are those from 1024 through 49151. (See
http://www.iana.org/assignments/port-numbers.)
The IANA needs a technical description on your proposed use of a user port
number. We require enough detail to understand how your application uses the
network. Once we have the above information in hand, and understand it, we
can assign a user port number. "
-josh
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