Twilio's Lookup API currently only handles a single phone number per request. If you have a batch of several phone numbers you would like to lookup, we recommend that you make multiple requests to Twilio's API.
For more information about the Lookup API, see the following resources:
Notice: Responses to your requests containing HTTP 429 or Error code 20429 indicate that you have hit the API request concurrency limit. For more information, see Twilio API response Error 429 "Too Many Requests".