OID value: 220.127.116.11
Obsolete? From the Proposed Draft Amendment (PDAM) on ISO/IEC 9594-8 (ITU-T Rec. X.509): "This field provides for optional additional information about the primary public key being certified. It can include a key identifier, an indication of the intended use of that key, and/or an indication of the period of use of the corresponding private key..."
URL for further info: http://mlarchive.ima.com/pem-dev/1995/0241.html
See also the OID Repository website reference for 18.104.22.168