Find Name (and IP) of Domain controller in network

You are working/discovering at a client site and you want to determine the domain controllers.
There are many many sources and methods to skin this cat. Here is a digest of a few of the best methods.

nslookup from command line
nslookup
set type=all
_ldap._tcp.dc._msdcs.DOMAIN_NAME
*probably the most standard, all you need is any Windows machine

from command line
set l                              (Lowercase "L")
*will only show the domain controller that authenticated you - does not show all domain controllers

From command line
gpresult /r
*will only show the domain controller that provided group policy to you at logon - does not show all domain controllers

From PowerShell
Import-Module ActiveDirectory
Get-ADDomainController | select name
*assumes you have RSAT and powershell installed
*only shows a domain controller not all domain controllers

My personal favorite
From command line
nstest /dclist:domain
*shows all domain controllers and their AD site