How do I find all DHCP servers on my Windows network?

Dear Charles, 

Microsoft offers this solution: 
How to Use Netsh.exe to Authorize, Unauthorize and List DHCP Servers
in Active Directory
<http://support.microsoft.com/default.aspx?scid=kb;en-us;303351> 

See also: 
Determining All IP Addresses for All DHCP Servers 
<http://vbnet.mvps.org/index.html?code/network/getadaptersinfo-dhcpserveraddresses.htm>

"Dhcploc.exe

Dhcploc.exe is a command-line tool that is part of the Windows Support
Tools found in the \Support\Tools folder on your Windows XP product CD
and it can be used to display all DHCP servers that are active on the
local subnet. Dhcploc.exe has been around since Windows NT 4.0 and it
works by sending out DHCPREQUEST messages and displaying the IP
addresses of the DHCP servers that responded with DHCPACK. You can
find the syntax of this tool in the Help file that is installed when
you install the Support Tools on your machine."
(Windows Security.com ,
<http://www.windowsecurity.com/pages/article_p.asp?id=1349>).

I hope this answers your question. Please contact me if you need any
further clarifications on this answer before you rate it. My search
terms were:
"all DHCP servers" windows