iSNS database unique ID

I am developing an iSNS client for an iSCSI target that supports
multiple portals.  It's possible that the target portals could be
connected to different networks so I'd like to determine if each target
portal has access to the same iSNS database.  Section 6.9.1 of RFC 4171
(iSNS) states that an iSNS client can query for the iSNS Server Vendor
OUI, but I assume that wouldn't be a unique value for the iSNS database.
Is there some other value an iSNS client can query that would be unique
to the iSNS database?
 
If not, then I could have one portal register the target's Network
Entity and then have each portal query the target's registration to
determine if they can retrieve the target's Network Entity or not.  Is
there a better method?
 
Thanks,
Paul

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