[BC] Comprehensive computer networking port list

[RichardBJohnson at comcast.net]

Ports with numbers over 2,000, although defined, are generally
considered "available."

What this means is if, for example, one is using FTP for file-transfer,
both sides may negotiate to use the next unused port that they find
for the data even though FTP data is supposed to use port 20.
You are probably seeing somebody transfer such data. Also,
database access (MySQL) can use a succession of ports
starting at 3306 up to, but not including 3346

Any time you click on a ".pdf" file, for instance, the FTP protocol is used
to retrieve the file for view locally.

If you have access to a Unix or Linux machine, you can execute
`more /etc/services` to view The defined service ports.

The ports used for "bad" things are:

23 Telnet (remote login)
25 Mail server
50 Mail remote check
53 Domain name-server


--
Cheers,
Richard B. Johnson
Read about my book
http://www.LymanSchool.org


 -------------- Original message ----------------------
From: Xmitters at aol.com
> Hello:
> 
> Commview shows significant usage of port 3907, yet Activeports shows nothing 
> attached to that port. There have been over 2 mb of data sent over 3907 to one 
> of my laptops in the last couple of minutes; not a lot, but what is it? 
> Occasionally, Commview will also show dozens of ports in numerical succession in 
> the 3000 range. My guess is that there is a port scanner running somewhere but 
> the source-destination IP shown in Commview for the Portscan does not show 
> anything using that port range in Activeports on the two machines in question. 

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