---
title: "Free carrier lookup"
url: "https://lookvalid.com/tools/carrier-lookup.md"
canonical_url: "https://lookvalid.com/tools/carrier-lookup"
last_updated: "2026-10-17"
type: "tool"
summary: "Look up the carrier a US phone number block was originally assigned to for free, from the public North American Numbering Plan records."
related: ["https://lookvalid.com/docs/api/carrier-lookup.md"]
---

# Free carrier lookup

Look up the carrier a US phone number block was originally assigned to for free, from the public North American Numbering Plan records.

Enter a US phone number. We show the carrier the number block was first assigned to, the holder of the whole code and where the block is registered.

## Facts

- Free, no account needed. Rate limited per visitor.
- Runs the `carrier-lookup` product. The same lookup through the API costs 1 credit.
- API reference: [carrier-lookup](https://lookvalid.com/docs/api/carrier-lookup.md)

We read the public central office code and thousands-block reports that the North American Numbering Plan Administrator publishes. A US number is split into its area code, exchange and block, and we look up who received that block.

No call or message is sent, so the person who owns the number never sees the lookup.

## Related

- [Carrier Lookup (original carrier) reference](https://lookvalid.com/docs/api/carrier-lookup.md)