# Check the format of a phone number without a network call

`GET /lookup/validate` · Rivier · voice

Check the format of a phone number without a network call: valid or not, why, its country, a readable form, and whether its shape says mobile, toll-free or premium-rate.

- Scope: voice:read
- Mcp: rivier_lookup_validate
- Graphql: Query.voiceLookupNumberValidate
- Sdk: lookup.validate
- Cli: lookup validate

## Parameters

- `number` (query, required), string
- `countryCode` (query), string

## Responses

- `200`: Success
- `400`: The request was malformed
- `401`: No valid credential
- `403`: The credential lacks the scope, origin or address
- `429`: Over the key's rate limit; see Retry-After

## Example

```sh
curl -X GET 'https://api.rivier.ai/lookup/validate' \
  -H 'Authorization: Bearer $KEY'
```