Gee whiz, where? Working 40 years with federal cops of various kinds, but mostly with cops who give prosecutors winnable cases with no problems.
Where did you get the idea that in a situation where there may be potentially be a real criminal case down the road that you can start by gathering information surreptitiously?
In this instance ~ a question of what address relates to what person, there is no general federal record to reference for that purpose ~ but there are private records, e.g. a phone book perhaps.
The question was why cops end up with bad addresses and there's your answer ~ they don't look ~ and they don't look because virtually every readily accessible source they could use is privately held.
Uh huh. 40 years. Sure. Let's put your rambling aside for a minute, and get back to what you claimed. Your exact claim: "The second they go to the internet to either verify or obtain an address they need at least an administrative level warrant." That is categorically false. In fact, anyone, police officer or not can use the internet, or more sophisticated resources like Accurint to obtain all sorts of information about you. You also seem to think that you know far more than you do about what is protected by a Fourth Amendment. When you get a J.D. come back and talk to me.