Line type
Mobile, landline, or VoIP. Most spam calls come from internet-based VoIP lines, not from real phones.
Free tool
Spam number lookup: who just called you?
Paste the number. You get the line type, the carrier and a risk level in seconds.
Free, no signup. Up to 5 lookups a minute. US numbers only.
What comes back
- line_type
- Mobile, landline, or an internet VoIP line.
- carrier
- The network the number actually runs on.
- risk_level
- Spam reports and network signals, in plain English.
It reads the line, not the caller ID.
Caller ID is easy to spoof. The carrier record behind a number is not, and that is what this checks.
Carrier
The network behind the number. A caller claiming to be your bank from a bulk VoIP carrier is a red flag.
Risk level
A risk score built from spam reports and network signals, translated into plain English.
Line type, carrier and risk level come from 1Lookup’s phone number lookup API.
Spam call questions
What people ask right after an unknown number rings.
Yes, this one. Paste any US number into the box above and you get its line type, the carrier behind it and a risk level, free and with no signup. It does not show a name or an address.
Look it up before you call back. A number that claims to be your bank, a delivery service or a government office but comes back as a bulk VoIP line was very likely spoofed. A high risk level means people have reported it, or its network signals look like spam. When in doubt, hang up and call the organization on the number printed on your card or on its official website.
Usually the caller learns your number is live and answered, which tends to bring more calls. Some scams ring once from an international or premium-rate number, so calling back costs you by the minute. If you do not recognize a number, look it up first or let it go to voicemail.
Watch for three signs together: a number that looks local but that you do not know, a VoIP line rather than a mobile or a landline, and a caller who wants you to act fast, pay, or confirm personal details. Real banks and agencies do not ask for passwords over the phone.
Usually because your number was sold. Quote forms, listings, contests and loyalty signups pass numbers to lead buyers, and from there to autodialers. Blocking one caller does not take you off the list. Giving each form a number you can burn does.
Spam calls are not random. Your number was sold.
Looking up one caller tells you what that number is. It does not stop the next twenty.
Somebody you gave it to passed it on
A quote form, a listing, a test drive, a contest, a warranty card. One of them handed your number down a chain of buyers, and once it is on that chain you cannot take it back. The calls keep landing on the line your family uses.
Give the next form a number you can burn
ExpressNumber is Hide My Email for your phone number. You get real US numbers to hand out instead of your own, and every call and text forwards to the phone you already carry. The form only ever sees the burner.
Name it, and you will know who sold you
Give each number a name, like Car dealer or Insurance quote. When one starts ringing like this, you see which name the calls came to. One tap burns it, and every other number keeps working.
Stop handing out the number you use.
Next time a form asks for a phone number, give it one you can burn. Calls and texts still reach your real phone.
Try it free for 7 days