Reference

bson_oid(3) on Linux

The text 815858808731, as Debian 10 (Buster) shipped it.

ObjectIDs Libbson provides a simple way to generate ObjectIDs. It can be used in a single-threaded or multi-threaded manner depending on your requirements. The bson_oid_t structure represents an ObjectID in MongoDB. It is a 96-bit identifier.

bson_oid(3) on Linux now