Hi!
I needed the ibnr to match stations from the Deutsche Bahn Hafas API to OSM. I found out the ibnrs by querying their API with a small script, but the API has gone defunct since.
You can however use the ÖBB endpoint instead with my fork of pyhafas (https://github.com/jbruechert/pyhafas/commits/zpcg-scraper/).

The script is then really simple:
```
from pyhafas import HafasClient
from pyhafas.profile import OEBBProfile
import sys

client = HafasClient(OEBBProfile())

locations = client.locations(sys.argv[1])
print([(s.name, s.id) for s in locations])
```