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Reconnex Corporation
78
Release 7.0.0.4
Search by Port Number
Because IANA (Internet Assigned Numbers Authority) maintains a list of well-known port numbers
used by UDP and TCP to identify specific processes, you can use a search by port number to find
data transmitted by certain services.
Common port assignments
Service
Port #
FTP
20/21
SSH
22
Telnet
23
SMTP
25
HTTP
80
HTTPS
443
POP3
110
NTP
123
NNTP
144
IRC
6667
To do a port search, go to Capture > Advanced Search > Protocol and select the Port element.
Example
This query searches for SSH and HTTPS traffic in both directions. You could select different items
from the Condition menu to narrow the search to incoming or outgoing transmissions.
Tip: You can use this method to search ports by range.
Note: When you search for a port or a port range, the system will return either a source or
destination port, but not both.
To get a complete result showing both source and destination ports, you must qualify your
search by specifying the port used by sender and recipient, e.g.:
To view the latest update to the port list, go to http://www.iana.org/assignments/port-numbers.
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