> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nebius.com/llms.txt
> Use this file to discover all available pages before exploring further.

# DNS quotas and constraints

## Quotas

DNS has a quota on the number of [DNS zones](/vpc/dns/overview). System-managed zones, for example, `<network_ID>.compute.internal.`, count toward this quota.

For details on what quotas are and how to manage them, see [Quotas in Nebius AI Cloud](/overview/quotas).

| Quota name | Default value per [region](/overview/regions) |
| ---------- | --------------------------------------------- |
| DNS zones  | 100                                           |

## Constraints

[DNS zones](/vpc/dns/manage-zones) and [DNS records](/vpc/dns/manage-records) have the following technical constraints:

| Constraint                                                   | Value |
| ------------------------------------------------------------ | ----- |
| Records in a zone                                            | 1000  |
| Records with the same relative name and type in a zone       | 20    |
| Characters in a zone domain name, including the trailing dot | 252   |
| Characters in a record relative name                         | 252   |

To raise the number of records in a specific zone, or the number of records with the same relative name and type in it, [contact support](https://console.nebius.com/support).

### Zone domain name restrictions

Give a zone a domain name of at least two labels, for example, `my.example.`. Single-label names, such as `example.`, aren't available.

Nebius AI Cloud also reserves the domain names that it owns:

* The `internal.` domain
* `ns.internal.`, `compute.internal.` and `nebius.internal.` and all of their subdomains
* Domain names used for internal checks, such as `example.invalid.`

If you use one of these domain names, creating the zone fails with a `PermissionDenied` error that no general role lifts.