All geographical features in GeoNames are categorized into one out of nine feature classes and further subcategorized into one out of 645 feature codes.

Prefix
geonames.feature
Links
Homepage
Contact
Missing Contact
Pattern for Local Unique Identifiers
Missing LUI pattern
Example Local Unique Identifier
ADM1   Resolve
Example CURIE
geonames.feature:ADM1
Contributors
Providers

A provider turns a local unique identifiers from a resource into a URI. Many providers are also resolvable as URLs (i.e., they can be used in a web browser).

The local unique identifier ADM1 is used to demonstrate the providers available for GeoNames Feature Code. A guide for curating additional providers can be found here.

Name Metaprefix URI
GeoNames Feature Code geonames.feature https://www.geonames.org/recent-changes/featurecode/ADM1/
Bioregistry bioregistry https://bioregistry.io/geonames.feature:ADM1