|Secondary house numbers known as "číslo orientační" in the Czech Republic.|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
Even though this key was not approved officially, it was accepted as a part of widely used, official address tagging system in Czechia and Slovakia.
Usage in Czechia
For instructions on tagging addresses in the Czech Republic see Czech address system(cs).
Usage in Slovakia
A page in Slovak documents the current practice in Slovakia.
Here’s a common usage example for a building with multiple entrances sharing the same conscription number: