Question : How can I know the ip address of the proxy that keeps sending me messages?

I want to know who send me messages from the same ip?
I think it is one of my rival.
But I wonder which one..
I think they use proxy,
I know the ip address but I do not now which company it belongs to
thank you in advance..

Answer : How can I know the ip address of the proxy that keeps sending me messages?

Try to use whois tool:
http://whois.domaintools.com/
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