Free tools / Reverse Phone Lookup
Reverse phone lookup
A number you do not recognize called and did not leave a message. Before you call back, this page tells you what the phone network knows about the line: whether it is a real assigned number, whether it is a mobile, a landline or a VoIP line, which carrier owns it, and the city it was issued from.
That combination answers most of the question. A VoIP number on a wholesale carrier issued in a city you have no connection to is almost always a robocaller or a spoofed line. A mobile on a major carrier in your own area is probably a person. The caller name field, which returns the name the carrier has on the line, is available on a free API trial because carriers charge per query for it.
What you get back
Assigned or spoofed. Spoofed caller IDs often use numbers that were never issued. If we say the number is not assigned, the caller ID was faked and calling back will go nowhere.
Line type. VoIP lines are cheap and disposable, which is why they dominate scam calls. Mobile and landline numbers are tied to an account with a carrier.
Carrier. Big consumer carriers versus wholesale VoIP providers. The name tells you which world the number lives in.
Issued location. The rate center the number belongs to. Not where the caller is standing, but where the number came from, which is still useful for spotting mismatches.
How to use it
- Enter the number exactly as it appeared on your caller ID.
- Press the button. We query the live routing database, so the carrier shown is the current one even if the number was ported.
- Judge the pattern. Unassigned, VoIP, or a wholesale carrier far from you are the three biggest red flags. For the registered caller name, use the API.
Who uses this
People screening missed calls. Knowing the line is a datacenter VoIP number saves a callback to a scam.
Small businesses. Front desks check unknown numbers before returning calls that came in during closed hours.
Fraud and trust teams. The same signals (VoIP, wholesale carrier, unassigned) flag risky signups at scale through the API.
Same check, in your code
One API key, one credit pool, 1,000 free lookups to start. Phone, email, IP and DNS checks from a single endpoint, and you only pay for lookups that return an answer.
Start free Read the docsQuestions
Will this tell me the person's name?
The free page shows carrier, line type and location. Caller name (CNAM), which is the name registered on the line with the carrier, is available through the API. We do not provide addresses, relatives or background reports.
The number shows as unassigned. What does that mean?
No carrier has that number in service. The call you received used a spoofed caller ID. Do not call back; there is nothing on the other end.
Why does the location not match where the caller said they were?
We show where the number was issued, not where the phone is. Mobiles travel and VoIP numbers can be bought for any city. A mismatch between the claimed location and the issued location is itself a useful signal.
Is it a scam if the line type is VoIP?
Not always. Plenty of legitimate businesses run on VoIP. But VoIP plus a wholesale carrier plus no caller name is the classic robocall fingerprint.
Can I check a number that texted me?
Yes. Same lookup. If the result says landline, the text came through a texting-enabled landline service or was spoofed.