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OS X comes bundled with a network utility suite aptly called Network Utility. It's just a wrapper for command line Unix tools. Nothing more. Not too swift. It has to pipe control through to the command line and then back. Speed isn't its hallmark.
Spike is also a network utility named after the famous Goldeneye scene where Izabella Scorupco tries to nail Alan Cumming's grid so the sparks start flying. Spike runs its own native code. It's faster. And prettier. And it's easier to use: you don't have to parse away URLs for example - Spike does that automatically. And once you submit a query you never have to type it in again.
Scan a block of IPs to see who's in the neighbourhood. Ping to see who's at home. The 17 list found here was assembled by Spike. Scan as much as an entire B block with 16777216 IPs all at once. Click Copy and catch your scan on the clipboard.