📞 Who is calling? How to find out who called you
Got a call from an unknown number? Here's how to quickly find out who is calling — see the company behind the number, the operator, and whether others flagged it as spam.
Af Nummeropslag.dk · Sidst opdateret: 2026-07-01
How to find out who is calling
If you received a call from an unknown number, you can see who is calling in seconds. Enter the number in the lookup on the front page — we show the company behind the number (from the official CVR register), the telecom operator, and whether other Danes have flagged the number as spam or fraud. It's free and requires no sign-up.
Why is an unknown number calling?
Most calls from unknown numbers are perfectly legitimate — a tradesman, a doctor, a courier or a company you deal with. But some are telemarketing, spam or fraud. A single ring from a foreign number can be wangiri fraud, where the scammer hopes you call back to an expensive premium line. Always look up the number before calling back.
Is the number spam or fraud?
On every number page we show a spam score based on anonymous reports from real users. If the number is marked with ⚠, others found it annoying or fraudulent. You can contribute too: look up the number and mark who called — it helps the next person. See the most recently reported spam numbers.
See who's calling — right as the phone rings
To know the caller before you answer, the Nummeropslag app for iOS and Android can show the name and a spam warning right on the call screen. To avoid unwanted calls entirely, read How to stop spam calls.
Ofte stillede spørgsmål
How do I see who is calling from an unknown number?
Enter the number in the search field on the front page. We show the company from CVR, the operator, and whether the number is flagged as spam by other users.
Can I see who is calling for free?
Yes. Looking up a Danish number is free and requires no account.
Why do I get calls from numbers I don't know?
It may be legitimate companies, but also telemarketing, spam or fraud. Look up the number before calling back.
Do you show the name of a private individual?
No. We never show names of private individuals — only companies from the public CVR register and anonymous signals.
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Flere guides
How to stop spam calls · Smishing: how to spot fake scam texts (PostNord, MitID, bank) · Wangiri scam: never call back unknown foreign numbers · Sådan blokerer du spam- og fupopkald på iPhone og Android · What does +45 mean? · How does Nummeropslag.dk work? · Danish phone numbers: types and structure · MitID- og banksvindel på telefonen: sådan undgår du fælden · "Hej mor"-svindel og AI-stemmer: sådan tjekker du, om det er ægte · Hvem ringer fra et 70-, 80- eller 90-nummer? (og hvad koster det) · Ukendt dansk nummer ringede — sådan finder du ud af, hvem det er · Spamopkald i Danmark — sådan stopper og anmelder du dem · Robinsonlisten: tilmeld dig og undgå uopfordret telemarketing · Spoofing: forfalsket telefonnummer — hvad er det og hvad gør du? · Nummerportabilitet: behold dit nummer, når du skifter teleselskab