bson_oid(3) on Linux
The text 0550a9440ef1, as Debian 11 (Bullseye) 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.