OID value: 1.2.840.113533
This OID belongs to Nortel Networks
The subbranch 1.2.840.113533.7 belongs to Entrust Technologies (formerly Nortel Secure Networks), which led to this OID being incorrectly identified here as belonging to Entrust, but it belongs to Nortel Networks; this has been verified by Christopher Oliva <Chris.Oliva at entrust.com> of Entrust.
The OID tree 188.8.131.52.4.1.562, assigned by IANA, also belongs to Entrust.
See also the OID Repository website reference for 1.2.840.113533