SNMP-USER-BASED-SM-MIB(7) on Linux
The text e53a47ac40ec, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
The Erlang/OTP MIB module for the SNMP user-based security model