Carrier data: NANPA/CNAC files as of 2026-11-03 · FTC complaint files through 2026-11-03 · FCC complaints through 2026-11-02
Check whether phone numbers are VoIP - virtual numbers issued through internet phone carriers rather than a mobile network or a local phone company. Paste or upload up to 50 numbers - free, no signup. Each one comes back VoIP, mobile, landline or unknown (fixed_or_mobile), with the carrier behind it and whether the number is valid. Download the result as CSV, or only the mobile numbers. US and Canadian numbers are classified by the carrier that holds the number block in public NANPA/CNAC records; ported numbers are not detected.
Up to 50 rows per check, a few checks per hour. Numbers checked here are not stored. Bigger lists: enter your email under the result to check up to 10,000 numbers in a free account, or get a free API key. One number with the full risk breakdown: phone number validator.
VoIP numbers are cheap to get and easy to drop, so sign-up flows, marketplaces and fraud teams check for them before they trust a number - one-time-password abuse and fake accounts often run on them. Plenty of real people and businesses use VoIP too, so treat it as a signal to weigh, not a verdict.
For SMS campaigns, a VoIP number reaches a different audience than a mobile one: it may be a business line, an app or a forwarding number. The result lets you decide whether to keep them.
US and Canadian numbers: by the carrier that holds the number's block in the public NANPA and CNAC numbering files. Blocks held by VoIP carriers - Bandwidth, Onvoy (Sinch), Telnyx, Twilio, Peerless Network, Commio, IP Horizon, Vonage and magicJack, plus smaller ones - come back voip, with the carrier named. Other countries: the national numbering plan, where some countries have dedicated VoIP ranges (for example, UK numbers starting with 056).
The limits: a number ported to a VoIP provider keeps its original block, and some VoIP services take numbers from ordinary phone companies - both show as mobile, landline or unknown. Detecting those needs a paid real-time lookup, which this check does not do.
No. Many businesses and people use VoIP numbers every day. It is one signal: weigh it with the rest of the result - whether the number is valid, its country and its FTC and FCC complaint history (US numbers).
Yes. GET /v1/phone/{number} returns line_type: "voip" and a voip_line risk signal with the carrier name. A free key has no monthly limit during early access - see the API docs.
Up to 50 per check on this page, no signup. For a whole list (up to 10,000 numbers), enter your email under the result and we will send you a link that creates an account and checks every number - free, with no monthly limit during early access. Longer lists: upload more files from your account.
Not necessarily. Many VoIP numbers can receive texts, and some belong to real businesses. Keep them if your SMS provider accepts them; if you want mobile numbers only, the MOBILE ONLY download keeps only numbers confirmed mobile - landlines, VoIP and numbers of unknown type are left out (review those in the full CSV).
No. Valid means the number fits an assigned range, not that someone answers it. Finding disconnected numbers needs a paid real-time (HLR) lookup, which this check does not do.
Enter your email under the result and the whole list is checked in a free account - up to 10,000 numbers per file, no monthly limit during early access, no credit card. Longer list? Split it into files and upload each in your dashboard, or email us to send one big file. Need the same data by API? Get a free key.