Disambiguate WWN in vSphere 5.x

Points of My Scenario:
1. I am admin of a vSphere 5.5 implementation
2. I am able to find the WWN on my fiber channel HBA's
3. I am confused by the two groups of 64-bit numbers - for example, the vSphere Client shows: 20:00:00:00:d3:a5:97:e4    10:00:00:00:d3:a5:97:e4
4. Note that the groups of hexadecimal numbers are identical, except for the first digits ("2" in the first group, "1" in the second group)
5. Note also that the two sets of numbers are separated by a space in the "Storage Adapters" section of the host's Configuration tab
6. Points 4 and 5 are true for all my HBA's.

QUESTIONS: (a) Which number group is the true WWN; (b) Why the ambiguity of putting two 64-bit numbers in one row under the WWN column (i.e., why are there 2 sets of 64-bit hexadecimal numbers displayed for the WWN?)
waltforbesSenior IT SpecialistAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
(a) Which number group is the true WWN;

the sticker stuck on the physical HBA

these are the numbers we record and use, when building and designing a FC design.

when looking in vSphere Client, you've got WWNN (World Wide Node Name) and WWPN (World Wide Port Name) displayed.
Saif AdilProduct Engineer IIICommented:
- There is a possibility that you have dual port HBA's
- run this command on the esxi to get the details
   esxcli storage core adapter list

In Fibre Channel networks,

A WWN may be used as a WWNN (World Wide Node Name) to identify a switch,
A WWPN (World Wide Port Name) to identify an individual port on a switch

A WWPN (World Wide Port Name) is physically assigned to a part in a Fibre Channel device, such as a FC HBA or SAN
waltforbesSenior IT SpecialistAuthor Commented:
@Andrew Hancock: are you suggesting that (a) the first 64-bit number is the WWNN and the second number is the WWPN; (b) the HBA is a dual-port device, and thus (c) if this were a single-port device, I would merely have a single 64-bit number?

@Saif Adil: in reference to the attached screenshot, what indicates that the HBA has multiple ports (or single ports)? Note that the 64-bit numbers are separated by a colon instead of a space.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:

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waltforbesSenior IT SpecialistAuthor Commented:
Woohoo! Light-bulbs & party sirens! Epiphany has been achieved: many thanks to you both!
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