Free tool

A free spam number lookup shows whether a number is reported as spam or flagged as a robocaller.

A spam number lookup tells you whether a phone number has a record of spam calls. 1Lookup's free spam number lookup reads whether a US or Canadian number is reported as spam and whether it is flagged as a robocaller, then gives a risk rating and a suggested action. A number nobody has rated shows as not rated, which is different from a clean result.

Example resultSample result for (202) 555-0147. Run any lookup above and it is replaced with yours.

High spam risk

Spam riskHigh

Reported as spamYes

Flagged as a robocallerYes

Suggested actionBlock the number

See where the 202 area code is, its local time and its history

See the score and the risk factors behind the rating.

Your free check shows the rating, the two signals it rests on and a suggested action. Sign up free to see the 0 to 100 score and the risk factors behind it, to check whole lists by CSV or API, and to start a 7-day free trial.

Need this at scale? Phone Spam Check API

Score spam and robocall risk across your entire number inventory, on a schedule.

Spam number lookup result card showing high spam risk, a number reported as spam and flagged as a robocaller, a suggested block and a blocked call on a phone

A spam number lookup tells you whether a number has a record of spam calls before you pick up.

Unknown calls are everywhere, and not all of them are harmless. A spam number lookup reads a number's reputation. This one checks two things for a US or Canadian number: whether people have reported it as spam, and whether it is flagged as a robocaller. It turns them into a risk rating of low, medium or high and a suggested action, so a missed call from a number you do not know is quick to check.

Basic caller ID apps show a name or a city and stop there. This lookup answers a different question, which is how the number has behaved. A number nobody has reported and that is on no robocaller list shows as not rated, so you can tell it apart from a number with a clean rating.

A number you do not recognize just called and left no voicemail. Run it here before you call back, free and with no account. Teams use the same check on the numbers they call from and on the callers who reach them, and whole lists run through the API or a CSV upload.

The area code does not make a call spam, and the caller's record does.

No US area code is a scam code in itself, and a spoofed local number can fool anyone. See what each code actually means in our area code reference. To see who the number is listed to, not just how risky it looks, use our free who called me lookup. If you place calls yourself, check a number against the Do Not Call Registry before you dial it with our free DNC check. If a number that called you looks too short, too long or oddly written, check whether it is a valid number with our free phone number validator. To read the same two signals with the FTC's fraud figures beside them, use our free phone number fraud checker. To see whether a number is a mobile, a landline or a VoIP line, use our free VoIP phone number lookup. For a mobile number outside the US and Canada, to see whether it is switched on and reachable right now, use our free HLR lookup. To see whether a number is a virtual (VoIP) line rather than a mobile or a landline, use our free virtual number checker. To check an email address or an IP address for fraud signals too, use our free fraud checker. If you place calls yourself, flag the numbers of known TCPA litigators before you dial with our free TCPA litigator check. To see which carrier the number that called you is on, use our free carrier lookup. To see who a US number is listed to, with the city and state on the listing, use our free reverse phone lookup.

The lookup reads two reputation signals and rates the number in three steps.

You enter the phone number.

Type or paste a US or Canadian number, with or without +1. It needs no app, account or payment.

We read the number's reputation.

1Lookup checks whether the number is reported as spam and whether it is flagged as a robocaller. Nothing is dialed, and the owner is not contacted.

You read the rating and the action.

The result shows the spam risk, the two signals as Yes, No or Not rated, and a suggested action. A free account opens the 0 to 100 score and the risk factors behind the rating.

The spam risk reads low, medium or high.

Every rated number gets one of three levels, so you know at a glance how cautious to be. The level follows the two signals below and nothing else.

Both signals are shown on their own.

Reported as spam and flagged as a robocaller each show Yes, No or Not rated. An automated line that people rate well, such as an appointment reminder, can be flagged as a robocaller and still rate low.

A number with no record shows as not rated.

A new number has no history, and having no record is not the same as having a good one. The lookup says not rated instead of guessing.

The suggested action is a plain next step.

It reads no action needed, verify, review or block the number, so the rating turns into something you can do about the call.

Who uses this tool

You can screen an unknown call before you call back.

Got a missed call from a number you do not recognize? A number reported as spam is a reason to let it go to voicemail or block it, and a number with no rating is a reason to wait for a message.

You can check a caller who says they are your bank or a delivery service.

Run the number before you share any detail or act on an urgent payment request. Then look the organization up yourself and call it on a number you already have.

You can check the numbers your team calls from.

Support and sales teams can see whether one of their own numbers is reported as spam or flagged as a robocaller, and switch lines before answer rates fall.

You can screen a list of US and Canadian numbers.

The free page checks one number at a time. The API and a CSV upload check a whole list.

Frequently asked questions

How do I check a phone number for spam?

Enter the number in the lookup above. It reads whether the number is reported as spam and whether it is flagged as a robocaller, then shows a risk rating and a suggested action. No app, account or payment is needed.

Is this number spam?

If the result says Yes next to Reported as spam, people have reported it. If it says Not rated, nobody has reported the number and it is on no robocaller list, and that is different from a clean rating.

What does not rated mean?

It means the reputation record has nothing on the number: nobody has reported it and it is on no robocaller list. A new number and a number the record has never seen look the same, so not rated is a reason to be careful rather than reassured.

How do I know if a call is a scam?

Warning signs include urgent demands for money, requests for gift cards or wire transfers, threats of arrest, and callers who pressure you to act immediately. Spoofed numbers and unfamiliar area codes are also red flags. A spam number lookup shows whether the number is reported as spam or flagged as a robocaller.

Should I answer calls from unknown numbers?

Generally, no. If a call matters, legitimate callers usually leave a voicemail. Answering can confirm to robocall systems that your line is active, leading to more spam. The safest habit is to screen unknown numbers, run a quick spam number check, and call back only numbers that come back low risk.

Is the spam number lookup free?

Yes. The rating, the two signals and the suggested action are free, with no account. A free account opens the 0 to 100 score and the risk factors behind each rating, and every plan starts with a 7-day free trial.

How do I report a spam number?

In the US you can report spam and scam calls at ReportFraud.ftc.gov and at donotcall.gov, and forward a spam text to 7726 (SPAM). Your carrier also has its own spam-reporting tools.

Can scammers fake or spoof a phone number?

Yes. Caller ID spoofing lets scammers display a number that is not really theirs, often a local one or a trusted organization's line. A reputation check judges the number shown, not the caller behind it, so never trust caller ID alone if a caller pressures you for money or personal information.

Does the lookup work for numbers outside the US and Canada?

No. This free page checks US and Canadian numbers only. Use our phone validator or carrier lookup for the validity, line type and carrier of a number in another country.

Can I check many phone numbers at once?

Yes. This free tool checks one number at a time. To screen a whole list or to check numbers inside your own systems, use the 1Lookup API or upload a CSV, starting with a 7-day free trial.

The first three digits of a US number tell you where it was assigned.

Every area code has its own page with the places it covers, the local time there, and what to do when a call from it looks spoofed. These are the codes people look up most.

Area code 213, downtown Los Angeles, also has a page for each of its 786 prefixes, with the company NANPA lists as the holder.

New area codes catch people out, because a number from one looks unfamiliar even when it is local. These are the newest working codes.

See every US area code and where it is

These free lookups answer the next question about a number that called you.

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Need full results or bulk lookups?

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