Number type check: mobile, landline, VoIP or toll-free

A number type lookup classifies a phone number and tells you whether it is valid. Use it to route contacts to the right channel, for example sending SMS only to numbers that can receive it.

What it tells you

• What kind of number it is: mobile, landline, VoIP or toll-free.
• Whether the number is valid.
• The carrier the number belongs to.
• The country the number belongs to.
• A suggested next action based on the result.

What you need to provide

The phone number you want to classify. International format (E.164) is strongly recommended.

What it costs

1 credit per lookup. Live per-product costs are shown on the Billing page in your dashboard.

How to run it

• In the dashboard: Number Type Detection
• From your code: POST /v1/nt-lookup, then see the Developer Hub at app.1lookup.io/developer-hub.

Good to know

• This tells you what a number is, not whether a handset is switched on at this moment.
• Results are point-in-time. Numbers get reassigned, and a line can move between number types, so re-check numbers you have held for a while.
• Number Validation covers line type alongside carrier, location and a fraud score in one call. Use this lookup when the number type is all you need.
• VoIP is not the same as bad. Plenty of real people and businesses use VoIP lines, so decide for yourself how to treat them rather than rejecting them outright.

Updated on: 24/08/2026