Dnsv6, Dnlsv6, Dndsv6, Dnldsv6, and Ensv6 are Network Optimized VM series that are currently in public preview and run on 5th Gen Intel Xeon Platinum 8573C (Emerald Rapids) with Azure Boost–based networking enhancements. However, preview VM families are not guaranteed to be visible or deployable in every subscription or region, and they may not appear in quota lists if they are not yet enabled for that subscription/region combination.
Key points from the available information:
- Network Optimized capabilities are tied to specific VM families: Dlnv6, Dnsv6, Ensv6, and related variants (Dnlsv6, Dndsv6, Dnldsv6).
- These sizes are explicitly marked as Preview.
- Preview features can have limited regional and subscription availability and may require backend enablement by Microsoft before they appear as selectable sizes or quota items.
- When supported, no extra in-VM enablement is required: using a supported size automatically gives the enhanced connection setup and higher connection limits.
Given that the sizes do not appear at all in the subscription (including in quota), the behavior is consistent with a subscription/region that is not yet onboarded for this preview. In that case, the next step is to open a support request with Azure Support under the subscription and ask specifically for:
- Enablement of Network Optimized VM preview sizes (Dlnv6/Dnsv6/Ensv6 family and their variants) for the subscription and target regions.
Once enabled and available in the chosen region, the sizes such as Dnlsv6, Dnsv6, Dndsv6, Dnldsv6, or Ensv6 should appear in the size picker and quota views, and can then be deployed like any other VM size.
References:
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