Bulk product global_carrier_batch

Global carrier lookup

Upload a whole file of numbers and download the carrier data when the task finishes.

An add-on for whole large lists — for a handful of phone numbers the realtime check answers in the same request. Realtime check →

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API contract

Two steps: submit the file, then check the task

Read the full API docs Open API Keys

Submitting returns a task id right away; check the task by that id and, once it succeeds, the response carries the result file download link. Each request is shown with its own response.

1. Submit the file

Balance for the valid lines is reserved, to be settled on completion, and the task starts running in the background.

cURL requestPOST /api/v1/bulk-tasks

curl -X POST "https://carrierlookup.online/api/v1/bulk-tasks" \
  -H "X-API-Key: sk_your_api_key" \
  -F service_type=global_carrier_batch \
  -F country=US \
  -F file=@numbers.txt

Response: task created200 OK

{
  "code": 0,
  "msg": "ok",
  "data": {
    "id": "3f9c2a7d8e4b4c1a9f0e6b2d5c8a7e13",
    "product": "global_carrier_batch",
    "status": "processing",
    "country": "US",
    "total": 1000,
    "created_at": "2026-09-08T09:30:00Z"
  }
}

2. Check the task

Poll by task id. A successful response carries the success and failure counts and the result file download link.

cURL requestGET /api/v1/bulk-tasks/{id}

curl "https://carrierlookup.online/api/v1/bulk-tasks/3f9c2a7d8e4b4c1a9f0e6b2d5c8a7e13" \
  -H "X-API-Key: sk_your_api_key"

Response: task finished200 OK

{
  "code": 0,
  "msg": "ok",
  "data": {
    "id": "3f9c2a7d8e4b4c1a9f0e6b2d5c8a7e13",
    "product": "global_carrier_batch",
    "status": "success",
    "country": "US",
    "total": 1000,
    "success_cnt": 990,
    "failure_cnt": 10,
    "result_url": "https://…/result.zip",
    "created_at": "2026-09-08T09:30:00Z"
  }
}

How it runs

What happens to a bulk task

Bulk is not realtime made bigger — it is submit once, run in the background, collect later. You do not need to keep the page open; task state and results stay in your dashboard.

01Upload the file
A .txt or .csv with one phone number per line. It is streamed straight through; nothing is written to disk.
02Precheck and reserve
Format and country rules are checked first, then balance is reserved for the valid lines and settled on completion. Nothing is charged if the precheck fails.
03Run in the background
The task runs on its own — close the page if you like. A failure is reported straight away and fully refunded.
04Download the result
Collect the file from the bulk check page. You pay only for phone numbers that actually returned a result; the difference is refunded.

Result fields

Columns in the result file

The download is a zip containing the full result table.

Result file columns

number · +14155552671
carrier · T-Mobile USA
underlying_carrier · T-Mobile USA
number_type · mobile
country_code · US
region · California
city · San Francisco

Best for

When to reach for this one

List segmentation
Routing cost review
Database hygiene

Direct answer

What is the bulk Global carrier lookup?

Bulk carrier lookup is built for lists from a thousand numbers upward: upload a file, the task runs in the background, and you download a result archive when it completes. Pick the country the numbers belong to when you upload: it is submitted with the file, completes any number that has no country code, and the file is checked against it.

Clear boundaries

What this product does not do

It describes the network a number was originally allocated to. It does not follow number portability, so it is not necessarily the carrier serving the number today.
It is not a reachability check and not identity verification: it does not say whether the number is in service, nor who owns it.
Nothing is sent to the numbers in the file — the lookup runs against allocation data.
Results reflect the moment the task ran. Run it again for a fresh state — stored results are never refreshed for you.
Download links expire. Fetch the file soon after the task finishes; if a link expires, check the task again for a new one.

When bulk fits

When bulk is worth it — and when realtime is faster

	Realtime check	Bulk check
How many phone numbers	1 phone number per single check; several per multi request — exact caps are in the API docs	A whole large list in one task — the current size range is on the pricing page
Getting results	Right away: single and multi-endpoint answer in the same response; the dashboard returns them one by one	Download a result file when the task finishes
Country	None to pick — each number carries its own country code, mix freely in one request	One country per task, selected at upload and submitted with the file
Result shape	JSON, fields per phone number	Result file (zip with the full table and split lists)
Typical use	Form validation, agent lookups, pre-send gating	List hygiene, pre-campaign filtering, stored-data cleanup

Realtime check · View pricing

Product FAQ

About Global carrier lookup

When should I use bulk instead of a realtime check?

Use bulk for a whole large list. For a handful of phone numbers the realtime check answers in the same request, with no task to schedule.

What happens to invalid phone numbers in the file?

The precheck drops malformed lines, so they never enter the billable count. Of the phone numbers that remain, any the upstream cannot resolve are not charged either. You pay only for phone numbers that actually return a result.

How long does a task take?

It depends on the phone number count and the product. You can close the page after submitting; the task runs in the background and the result waits for you on the bulk check page.

Do I get refunded if it fails?

Yes. A failed task is refunded in full. If the task succeeds but some phone numbers return nothing, that portion is refunded automatically. The difference between the reserved amount and what was actually charged always comes back.

Create an account to submit a bulk task

Bulk and realtime checks draw on the same balance — nothing extra to enable. Sign up and upload your first file on the bulk check page.