Hi Sam,
vSZ-H (and SZ-300) support 2048 Domains.
Domains are generally used to create separate administration elements allowing different administrators and role policies or to organize customer types to align with business groups.
I believe the Domain names are restricted to characters permitted
![Image_ images_messages_5f91c439135b77e2479cc75e_1f497ab2d4eb145f2b3548cd24284f97_RackMultipart20180807124727woj-81716124-8797-4b3d-b91c-f16f7fcb7071-770620837.png1533670874 Image_ images_messages_5f91c439135b77e2479cc75e_1f497ab2d4eb145f2b3548cd24284f97_RackMultipart20180807124727woj-81716124-8797-4b3d-b91c-f16f7fcb7071-770620837.png1533670874](/t5/image/serverpage/image-id/799i70A4AB9C5BA24953/image-size/large?v=v2&px=999)
![]()
I hope this is the information you are looking for.