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Azure Public IP(s) are zone redundant free of cost natively - Generally Available

Availability zone gives high availability to an application as well as information by forestalling the physical datacenter disappointments by involving replication of the asset in extra datacenter.
Azure typically has 3 zones per region (and not all regions support zone). Thus, while setting up the environment we really want to pick the right region based on our usecase.

Public IP helps to access a resource or an application publicly.

Azure offers 2 types of SKU for public IP as below

  1. Basic
  2. Standard

Only Standard SKU gives zone facility. Basic SKU is always non-zonal and this SKU also will be retired 09/2025.

Standard public IP can be fell into any of the below category

  1. No Zone / Non-Zonal - No availability zone at all
  2. Zonal - Our services can be replicated in any one of selected zones from three zones.
  3. Zone redundant - Resource will be replicated in all 3 zones. It is opposite of "No Zone"

Unless you specifically choose or pin zone, public IP is zone redundant (i.e., single public IP is replicated in 3 zones).

I guess, as of now azure allows to select only one zone as zonal whereas you can choose more than one different zone while crating VMs

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