Each agency, I'm sure, has it's own policies and procedures for warrant validation, application, and execution. I can only speak to that of which I know. So there's my disclaimer.
Each arrest warrant includes an address for the suspect, if known. If not, then we leave it blank. Sometimes we use the L/K/A, Last Known Address. The address can be obtained from a number of sources, and I'm not going to get into details here for obvious reasons. But we (my agency) make every effort to get the actual address where we believe the suspect is residing at, at the time of the warrant application.
So yes, we make every effort to confirm, and then validate the address. Believe it or not, Google Earth is a great source for making sure the address actually exists, as well as county tax records. We routinely receive civil process and warrants from other agencies where we look up the address on their paperwork...and it doesn't exist. We simply mail it back with the standard "Address Does Not Exist" stamp, and leave it to them to correct their mistake. If it's a felony warrant, we might contact the originating agency to see if we can help them figure out the correct address, but they still have to amend and forward the corrected warrant.
"Wrong address" warrant service can...and has...resulted in tragedy. We make every effort to make sure that the door we knock on, or down, is the right one. As a result, it's been a long time here since we went through the wrong door. The Devil hides in the details. Get 'em right, and there's less chance you end up on the 6 o'clock news trying to explain your f*** up.
Hope this helps.