If you use the Network Utility to do 'whois' lookups, but prefer to use a whois server that's not listed in Apple's choices, there's no apparent way to add your servers to the displayed list within the pop-up list -- so you end up typing in your preferred whois server each time you run the program. But with just a bit of preference editing, it's actually quite easy to add your preferred choices. Here's how to do it.
- Go to /Users/user_name/Library/Preferences.
- Quit Network Utility if it's running.
- Open com.apple.NetworkUtility.plist file in propertylisteditor (or TextEdit if you don't have the Dev Tools installed).
- Open the NUWhoisServers key (in TextEdit, look for <key>NUWhoisServers</key>). Add/delete additional strings with the whois servers you would like to keep/remove permanently from the Network Utilities server list (in TextEdit, insert additional <string>whois.server.name</string> values into the list, or delete the ones you don't wish to see).
- Save your changes and quit the editor.
- Re-launch Network Utility and see the new list of servers
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