Seldom are the only restrictions that apply to an address only the ones in a single software system. In fact, your address data could be the least of the problems you have to worry about.

When actually using all the addresses you stored for shipping stuff, it is almost guaranteed that the shipping company will cut off or drop lines from labels, and of course every shipping company is going to have its own quirks. Maybe just because not every address is going to fit onto a fixed label area in a fixed font size.

I have in fact lost several shipments to my address(es) due to every single kind of the above caveats.