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So I'm looking at my sent traffic in iftop and I'm connected to an IP I don't recognise and I'm sending quite a bit of traffic their way. I'd like to work out where in the world this IP goes to.

Online I've been running whois queries against IP addresses for a long time but I don't think I've ever been able to get it to work for IP addresses. Is there some trick to making the whois command handle IPs too?

Here's what I'm doing:

oli@bert:~$ whois
No whois server is known for this kind of object.
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up vote 3 down vote accepted is a multicast address for mDNS

This is my computer broadcasting to the local network via a multicast address.

The address is reserved so whois doesn't know what on earth to do with it. Perhaps they should improve the error message for muppets like me :o)

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