How to find the DHCP server on a network

[John Tabasz (jtabasz)]

One of the networks I am responsible for has a DHCP server that is
giving out an address already assigned to another host. I want to locate
this DHCP server and investigate it as a rogue server. 
Can someone suggest a clean way to identify the DHCP servers on a
network?
 
Thanks,
 
John
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