Existing users, 
The unix command:
grep ^465 /etc/services
or grep -i smtps ~/misc/services
I'm not sure what this gives you more than this?
It doesn't search the net. It doesn't have smtps or lots of other alternate port uses.
PortFinder
look up port numbers & application name mappings
Version: 0.6
why not use:
Feedback Type: Review
Contributed by: kholburn1 Saturday, March 12 2005 @ 05:01 PM PST
Product Platform: MacOSX
Used Product For: Less than a month
Recommend Product: NO
Comments
Re: why not use: - macsolu
Because the UNIX command-line-interface is a FOREIGN language to virtually all Mac users -- that's why. Sheesh.Saturday, March 26 2005 @ 12:47 PM PST
why not use? - eobrien
For me, neither of those commands produces any output.Saturday, March 26 2005 @ 11:50 PM PST
why not use: - toad_DMC
Um... 'cause PortFinder works, whereas the commands you gave did not (started terminal and ran... 1st gave no output at all, 2nd resulted in messages to the effect that no such directory/item exists) !!Sunday, March 27 2005 @ 11:17 AM PST
why not use: - GeekMonster
PortFinder uses the full database from iana.org who is responsible for the registering port numbers. The /etc/services file is a vendor specific representation of port #'s.The reason why you don't find smtps is that it has not been registered. Port 465 is actually registered to URL Rendesvous Directory for SSM
http://www.iana.org/assignments/port-numbers
---Developer---
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Saturday, March 12 2005 @ 08:31 PM PST