Is it possible to determine who is using a particular NIS server from the NIS server?

I have inherited a network of about 100 Linux systems. There were 3 different domains I want to consolidate into 1. I could log into each of the 100 systems to see which NIS server it is reporting to but I'd rather just login to the 3 NIS servers and see who is using that server. Is this possible?
I've googled this till I'm stupid. I keep getting documents on how to setup NIS and how to determine info from the client side. I want to determine this from the server side.

Thank you

only played with nis for a second or two, a long time ago, but, does this help:

http://serverfault.com/questions/336...-master-server

Also, does ypserv have any debug logging? I see "ypserv --debug" is an option, dunno what it would log though.

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I believe that will work. Thank you