$ openssl asn1parse -i < [EXTENSIONS]
    0:d=0  hl=2 l=  25 cons: SEQUENCE          
    2:d=1  hl=2 l=  23 cons:  SEQUENCE          
    4:d=2  hl=2 l=  12 prim:   OBJECT            :1.2.840.113554.4.1.72585.0
   18:d=2  hl=2 l=   1 prim:   BOOLEAN           :255
   21:d=2  hl=2 l=   4 prim:   OCTET STRING      [HEX DUMP]:030203B8
-----BEGIN EXTENSIONS-----
MBkwFwYMKoZIhvcSBAGEtwkAAQH/BAQDAgO4
-----END EXTENSIONS-----