If you know the distinguished name (DN) of a certificate holder or requester and can write this name in LDIF notation, you can use this format to search for an existing certificate or a certificate request.
To search for a certificate or certificate request using the Advanced DN feature:
On the Requests page, click Advanced Search.
The Advanced Screen page appears.
Use the Search menu under the heading Search Using Advanced Distinguished Name to choose between a search for an existing certificate and a certificate request.
In the Advanced DN field, enter the DN of the certificate holder or requester in LDIF notation.
Click Go to begin searching.
Information about the certificate or certificate request is displayed on the Requests page.
Search Using Certificate Status