## POST /api/v2/domains/{id}/nameservers

**Update domain nameservers**

Replace authoritative nameservers for one active domain. Get `{id}` from `GET /api/v2/domains` `data[].id` and read `GET /api/v2/domains/{id}/nameservers` first; call this endpoint only when `actions.canChangeNameservers.allowed` is true. HostUp managed nameservers are `primary.ns.hostup.se` and `secondary.ns.hostup.se`; using that pair queues a DNS-zone precheck and returns HTTP 202. External nameservers usually complete synchronously with HTTP 200. `nsips` is optional and aligned by index with `nameservers`; use it only for in-bailiwick child nameservers such as `ns1.example.com` when the registry requires glue IPs.

### Related Endpoints

- `GET /api/v2/domains/{id}/nameservers`: Get domain nameservers
- `POST /api/v2/domains/nameservers/validate`: Validate nameservers
- `POST /api/v2/domains/nameservers/lookup`: Look up current nameservers

### Headers

- `Accept`: application/json
- `Authorization`: Bearer YOUR_API_KEY
- Required API scope: `write:domains`
- `Content-Type`: application/json

### Parameters

- `id` (path, string, required): Public domain ID from `GET /api/v2/domains` `data[].id`. Do not invent this value; use the exact ID returned by the referenced API response. Example: `dom_01hxa3b4c5d6e7f8g9h0j1k2m3`

### Request Body

- `nameservers` (array<string>, required): At least two non-empty nameserver hostnames. Empty entries are ignored before the minimum count is checked. Example: `["primary.ns.hostup.se","secondary.ns.hostup.se"]`
- `nsips` (array<string>, optional): Optional glue IPs aligned by array index with `nameservers`; leave entries empty when no glue IP is needed. Example: `["192.0.2.53","192.0.2.54"]`

### Request Examples

#### Use HostUp managed nameservers

```bash
curl -X POST "https://cloud.hostup.se/api/v2/domains/dom_01hxa3b4c5d6e7f8g9h0j1k2m3/nameservers" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -d '{
    "nameservers": [
      "primary.ns.hostup.se",
      "secondary.ns.hostup.se"
    ]
  }'
```

```json
{
  "nameservers": [
    "primary.ns.hostup.se",
    "secondary.ns.hostup.se"
  ]
}
```

#### Use external nameservers

```bash
curl -X POST "https://cloud.hostup.se/api/v2/domains/dom_01hxa3b4c5d6e7f8g9h0j1k2m3/nameservers" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -d '{
    "nameservers": [
      "ns1.example.net",
      "ns2.example.net"
    ]
  }'
```

```json
{
  "nameservers": [
    "ns1.example.net",
    "ns2.example.net"
  ]
}
```

#### Use child nameservers with glue IPs

```bash
curl -X POST "https://cloud.hostup.se/api/v2/domains/dom_01hxa3b4c5d6e7f8g9h0j1k2m3/nameservers" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -d '{
    "nameservers": [
      "ns1.example.com",
      "ns2.example.com"
    ],
    "nsips": [
      "192.0.2.53",
      "192.0.2.54"
    ]
  }'
```

```json
{
  "nameservers": [
    "ns1.example.com",
    "ns2.example.com"
  ],
  "nsips": [
    "192.0.2.53",
    "192.0.2.54"
  ]
}
```

### Response Schema

- `updated` (boolean, optional) Example: `true`
- `syncTriggered` (boolean, optional) Example: `false`
- `serviceStatus` (string, optional) Example: `active`
  Allowed values: active, suspended, terminated, pending, cancelled, expired, fraud, unknown

### Responses

#### 200 - Nameservers updated synchronously.
```json
{
  "updated": true,
  "syncTriggered": false,
  "serviceStatus": "active"
}
```

#### 202 - HostUp managed nameserver precheck queued. Poll `operation.pollUrl` before assuming registry update completion.
```json
{
  "operation": {
    "status": "in_progress",
    "jobId": "dbj_01hxa3b4c5d6e7f8g9h0j1k2m3",
    "pollUrl": "/api/jobs/dbj_01hxa3b4c5d6e7f8g9h0j1k2m3"
  }
}
```

#### 400 - Invalid request. The response body is an RFC 7807 Problem Details document.
```json
{
  "type": "https://developer.hostup.se/errors/invalid_request",
  "title": "Invalid request",
  "status": 400,
  "detail": "The request body failed validation.",
  "code": "invalid_request",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z",
  "errors": [
    {
      "pointer": "/items/0/domainName",
      "detail": "`domainName` is required.",
      "code": "invalid_request"
    }
  ]
}
```

#### 401 - Unauthorized. Authentication is required.
```json
{
  "type": "https://developer.hostup.se/errors/unauthorized",
  "title": "Unauthorized",
  "status": 401,
  "detail": "Authentication is required.",
  "code": "unauthorized",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 403 - Forbidden. The caller lacks a required scope or does not own the resource.
```json
{
  "type": "https://developer.hostup.se/errors/forbidden",
  "title": "Forbidden",
  "status": 403,
  "detail": "The caller lacks a required scope or does not own the resource.",
  "code": "forbidden",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 404 - Not found. The resource does not exist or is not owned by the caller.
```json
{
  "type": "https://developer.hostup.se/errors/not_found",
  "title": "Not found",
  "status": 404,
  "detail": "The requested resource could not be found.",
  "code": "not_found",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 409 - Conflict. See the Problem Details `code` for the route-specific blocker and recovery fields.
```json
{
  "status": 409,
  "instance": "/api/v2/domains/dom_01hxa3b4c5d6e7f8g9h0j1k2m3/nameservers",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z",
  "type": "https://developer.hostup.se/errors/registry_lock_unlock_required",
  "title": "Registry lock blocks nameserver change",
  "detail": "Unlock the domain before changing nameservers.",
  "code": "registry_lock_unlock_required",
  "actions": {
    "canChangeNameservers": {
      "allowed": false,
      "reason": "Unlock the domain before changing nameservers."
    }
  }
}
```

#### 429 - Rate limited. Retry after the limit resets. 429 responses include `Retry-After` seconds plus `X-RateLimit-*` headers.
```json
{
  "type": "https://developer.hostup.se/errors/rate_limit_exceeded",
  "title": "Too many requests",
  "status": 429,
  "detail": "Too many requests. Retry after the limit resets.",
  "code": "rate_limit_exceeded",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 500 - Internal error. Retry later or contact support if the issue persists.
```json
{
  "type": "https://developer.hostup.se/errors/internal_error",
  "title": "Internal server error",
  "status": 500,
  "detail": "An unexpected error occurred. Retry later or contact support if the issue persists.",
  "code": "internal_error",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```