This is a version 2 certificate containing both the issuer unique ID and subject unique ID fields. $ openssl asn1parse -i < [TBS CERTIFICATE] 0:d=0 hl=2 l= 68 cons: SEQUENCE 2:d=1 hl=2 l= 3 cons: cont [ 0 ] 4:d=2 hl=2 l= 1 prim: INTEGER :01 7:d=1 hl=2 l= 1 prim: INTEGER :01 10:d=1 hl=2 l= 3 cons: SEQUENCE 12:d=2 hl=2 l= 1 prim: OCTET STRING [HEX DUMP]:01 15:d=1 hl=2 l= 3 cons: SEQUENCE 17:d=2 hl=2 l= 1 prim: OCTET STRING [HEX DUMP]:05 20:d=1 hl=2 l= 30 cons: SEQUENCE 22:d=2 hl=2 l= 13 prim: UTCTIME :121018031200Z 37:d=2 hl=2 l= 13 prim: UTCTIME :131018145959Z 52:d=1 hl=2 l= 3 cons: SEQUENCE 54:d=2 hl=2 l= 1 prim: OCTET STRING [HEX DUMP]:83 57:d=1 hl=2 l= 3 cons: SEQUENCE 59:d=2 hl=2 l= 1 prim: OCTET STRING [HEX DUMP]:F3 62:d=1 hl=2 l= 2 prim: cont [ 1 ] 66:d=1 hl=2 l= 2 prim: cont [ 2 ] -----BEGIN TBS CERTIFICATE----- MESgAwIBAQIBATADBAEBMAMEAQUwHhcNMTIxMDE4MDMxMjAwWhcNMTMxMDE4MTQ1OTU5WjADBAG DMAMEAfOBAgC5ggIAyg== -----END TBS CERTIFICATE----- -----BEGIN SERIAL NUMBER----- AQ== -----END SERIAL NUMBER----- $ openssl asn1parse -i < [SIGNATURE ALGORITHM] 0:d=0 hl=2 l= 3 cons: SEQUENCE 2:d=1 hl=2 l= 1 prim: OCTET STRING [HEX DUMP]:01 -----BEGIN SIGNATURE ALGORITHM----- MAMEAQE= -----END SIGNATURE ALGORITHM----- $ openssl asn1parse -i < [ISSUER] 0:d=0 hl=2 l= 3 cons: SEQUENCE 2:d=1 hl=2 l= 1 prim: OCTET STRING [HEX DUMP]:05 -----BEGIN ISSUER----- MAMEAQU= -----END ISSUER----- VALIDITY NOTBEFORE: year=2012, month=10, day=18, hours=3, minutes=12, seconds=0 -----BEGIN VALIDITY NOTBEFORE----- eWVhcj0yMDEyLCBtb250aD0xMCwgZGF5PTE4LCBob3Vycz0zLCBtaW51dGVzPTEyLCBzZWNvbmR zPTA= -----END VALIDITY NOTBEFORE----- VALIDITY NOTAFTER: year=2013, month=10, day=18, hours=14, minutes=59, seconds=59 -----BEGIN VALIDITY NOTAFTER----- eWVhcj0yMDEzLCBtb250aD0xMCwgZGF5PTE4LCBob3Vycz0xNCwgbWludXRlcz01OSwgc2Vjb25 kcz01OQ== -----END VALIDITY NOTAFTER----- $ openssl asn1parse -i < [SUBJECT] 0:d=0 hl=2 l= 3 cons: SEQUENCE 2:d=1 hl=2 l= 1 prim: OCTET STRING [HEX DUMP]:83 -----BEGIN SUBJECT----- MAMEAYM= -----END SUBJECT----- $ openssl asn1parse -i < [SPKI] 0:d=0 hl=2 l= 3 cons: SEQUENCE 2:d=1 hl=2 l= 1 prim: OCTET STRING [HEX DUMP]:F3 -----BEGIN SPKI----- MAMEAfM= -----END SPKI----- -----BEGIN ISSUER UNIQUE ID----- uQ== -----END ISSUER UNIQUE ID----- -----BEGIN SUBJECT UNIQUE ID----- yg== -----END SUBJECT UNIQUE ID-----