How to find IP address of a machine on network?

[Charles Darwin]

On Jan 16, 2009, at 2:27 PM, Thomas Kaiser wrote:

> You can use nmap in a terminal to scan the network for open ports.

I used to use nmap but then I found this on my mac (much faster for  
what we're trying to do here):

dns-sd -B _ssh._tcp .

This works with Zeroconf and (from man dns-sd's) supposedly comes  
with BSD.
Now here are my questions:
1. Is there something like this unique to *nix?
2. How do you run umap light so that it runs as fast as dns-sd (for  
what we want here) or possibly tops it?
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