If you work in a data center, or work with servers at all, Network Utility has probably been a useful tool over the years. However, if you kept that app in your dock and upgraded to Mavericks today, it's disappeared from your dock. The good news is that it's still available. Rather than living in the utilities folder, it's now in /System/Library/CoreServices. However, there's a faster way to get to it.
First open up the System Information app (Applications/Utilities) and then drop down the "Window" menu to select Network Utility:
Once it's in your Dock, be sure to Command+click and "Keep in Dock":
Now the app will be in your dock again and ready to be used.
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