User Guide

TCPView Professional
User’s Guide
7 DNS Name Resolution
By default TCPView Professional does not resolve IP addresses to their
names or port numbers to their descriptive text. For example, if
www.winternals.com has the IP address 10.0.0.1, TCPView Professional will
show the numeric representation. Well-defined port numbers have descriptive
names; for instance, port 80 is the http port. TCPView Professional has an
internal table for translating many port numbers to their names.
Select the resolve addresses
button or the Options|Resolve
Addresses menu entry to toggle name resolution. When name resolution is
enabled TCPView Professional performs IP address name lookup operations
in the background, updating the static and dynamic views as translations
complete. In many cases IP addresses do not have corresponding names,
and so are always shown numerically. If a name lookup fails for some reason,
TCPView Professional re-attempts the lookup ten seconds later if the address
is referenced by new entries in the static or dynamic views, or if you toggle
name resolution off and then on again.
Tip: You can quickly see what IP address corresponds to the name shown in
an entry or vice versa by selecting the entry and then toggling name
resolution with the Ctrl+R hotkey sequence.
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