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

# [Instance Domains] List the domains that can be attached

> Retrieve the domains of this project that can be pointed at this instance: active domains whose DNS zone is hosted here and that do not already point at another instance. A domain held elsewhere is not offered, because its zone cannot be written from here.



## OpenAPI

````yaml https://api.onetsolutions.net/schema get /v1/organizations/{organization_id}/projects/{project_id}/compute/instances/{instance_id}/domains/attachable
openapi: 3.0.3
info:
  title: OnetSolutions API
  version: v1 (v1)
  description: >

    ## Overview


    The OnetSolutions API provides programmatic access to manage your cloud
    infrastructure, domains, and web hosting services.


    ## Authentication


    All API requests require authentication using one of the following methods:


    - **JWT Token**: Obtain a token via login endpoints and include it in the
    `Authorization: Bearer <token>` header

    - **API Key**: Generate an API key from your account settings and use it as
    `Authorization: Bearer sk-onetsolutions-...`


    ## Rate Limiting


    API requests are rate-limited to ensure fair usage:

    - **Standard**: 1000 requests per minute

    - **Burst**: 100 requests per second


    ## Pagination


    List endpoints return paginated results. Use `page` and `page_size` query
    parameters.


    ## Error Handling


    The API uses standard HTTP status codes:

    - `200` Success

    - `201` Created

    - `400` Bad Request

    - `401` Unauthorized

    - `403` Forbidden

    - `404` Not Found

    - `429` Too Many Requests
servers:
  - url: https://api.onetsolutions.net
    description: Production
security: []
tags:
  - name: Authentication
    description: >-
      Login, passwordless authentication, MFA, OAuth providers, and token
      management.
  - name: Organizations
    description: >-
      Organization management, members, roles, modules, audit logs, and
      notification settings.
  - name: Projects
    description: Project management, team members, and project-scoped resources.
  - name: Compute
    description: >-
      Cloud instances, volumes, snapshots, backups, VPCs, firewalls, SSH keys,
      uptime monitors, and instance tasks.
  - name: Billing
    description: >-
      Shopping cart, orders, invoices, payments, payment methods, gateways,
      promo codes, and balance management.
  - name: Domains
    description: >-
      Domain availability, registration, transfers, DNS zones, DNS records, and
      TLD information.
  - name: Web Hosting
    description: >-
      cPanel-based web hosting, emails, databases, subdomains, FTP accounts,
      addon domains, and SSL certificates.
paths:
  /v1/organizations/{organization_id}/projects/{project_id}/compute/instances/{instance_id}/domains/attachable:
    get:
      tags:
        - Domains
      summary: '[Instance Domains] List the domains that can be attached'
      description: >-
        Retrieve the domains of this project that can be pointed at this
        instance: active domains whose DNS zone is hosted here and that do not
        already point at another instance. A domain held elsewhere is not
        offered, because its zone cannot be written from here.
      operationId: list_attachable_instance_domains
      parameters:
        - in: path
          name: instance_id
          schema:
            type: string
            format: uuid
          required: true
        - in: path
          name: organization_id
          schema:
            type: string
            format: uuid
          required: true
        - in: path
          name: project_id
          schema:
            type: string
            format: uuid
          required: true
      responses:
        '200':
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/AttachableDomain'
          description: The domains that can be attached to this instance
        '401':
          description: Authentication credentials were not provided or are invalid
        '403':
          description: You do not have permission to manage instances in this organization
        '404':
          description: Instance not found in this organization and project
      security:
        - BearerAuth: []
components:
  schemas:
    AttachableDomain:
      type: object
      properties:
        id:
          type: string
          format: uuid
          readOnly: true
        name:
          type: string
          readOnly: true
        status:
          enum:
            - pending
            - registering
            - active
            - expired
            - expiring_soon
            - suspended
            - transferring_in
            - transferring_out
            - pending_delete
            - deleted
            - failed
          type: string
          description: |-
            * `pending` - pending
            * `registering` - registering
            * `active` - active
            * `expired` - expired
            * `expiring_soon` - expiring soon
            * `suspended` - suspended
            * `transferring_in` - transferring in
            * `transferring_out` - transferring out
            * `pending_delete` - pending delete
            * `deleted` - deleted
            * `failed` - failed
          x-spec-enum-id: be42ed3d4dbabfa0
          readOnly: true
        expiration_date:
          type: string
          format: date
          readOnly: true
          nullable: true
      required:
        - expiration_date
        - id
        - name
        - status
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT or API Key
      description: >-
        Use `Authorization: Bearer <token>` header. Token can be a JWT token or
        an API key (format: `sk-onetsolutions-...`).

````