Unknown number lookup — free scam-number checker

Yes. No signup, no email collection, no upsell. We check the number against the GACS public blacklist of reported scam numbers, plus global sanctions sources. The full lookup is free for every visitor, every time.

GACS aggregates three sources: (1) public reports submitted directly to GACS by visitors and verified, (2) global sanctions and sanctioned-entity registries (OpenSanctions), and (3) cross-checks against scam-number lists republished from law-enforcement portals where licence permits. When 3 unique people report the same number, it auto-promotes to the live blacklist.

Most scam numbers rotate every few days, so a clean lookup doesn't guarantee safety. Apply the universal rules: don't share codes, don't pay over the phone, don't click links in unsolicited texts, and call back the company on a number you find on their official site — never the one in the message.

Three steps: (1) paste the number into the lookup tool above to see if anyone has flagged it as a scam, (2) Google the full number in quotes — legitimate businesses usually have it on their site, (3) if it claims to be your bank / Amazon / 'the IRS', hang up and call the official number from the company's website or the back of your card. Never call back the number from caller ID itself.

No. Returning a missed call from an unknown number can incur premium-rate charges (the 'Wangiri' scam — one-ring callback scams hit numbers worldwide). If it's important, the caller will leave a voicemail. If it's a delivery, the courier will text you a tracking link from a verified short code.

Truecaller requires an app install, account creation, and uploads your entire contact list to their servers — which is how their database is built. GACS is the opposite: a free web lookup that needs nothing from you. We never see your contacts. Reports are anonymous, identified only by a randomly generated fingerprint stored locally in your browser.

Yes. After checking a number above, click 'Report as scam' — one click, no email, no signup. The report adds to the public count for that number. When 3 unique people report the same number it auto-promotes to the live blacklist and gets a dedicated warning page indexed by Google.

That label comes from your carrier, not from the caller. T-Mobile, Verizon and AT&T all run their own analytics on call patterns — volume, duration, how often people hang up — and tag suspected spam before the call reaches you. It is a useful warning but not proof either way: real callers occasionally get tagged, and a fresh scam number won't be tagged at all until enough people report it. Look the number up here for a second, independent opinion.

Yes, easily, and it is the single most common trick in phone fraud. Caller ID spoofing lets anyone display any number they like, including your bank's real customer-service line printed on your card. This is why no lookup tool can promise a number is safe — the only reliable defence is to hang up and dial the company yourself using a number from their website or the back of your card.

Answering is not dangerous by itself — there is no scam that works simply because you picked up. The risk starts with what happens next: giving out a code, confirming personal details, or pressing a key to “be removed from the list” (which only confirms the line is live). If you do answer and anything feels rushed or urgent, hang up. A real organisation will never mind you calling them back.

Look the number up above. If GACS visitors have reported it, the number’s page shows how many reports are on file, what the callers claimed to be, and when the most recent report came in. If nobody has reported it, the page says so plainly rather than guessing.

Paste the number into the free lookup tool on this page. GACS matches it against the public registry of reported scam numbers, Do Not Call complaint data and global sanctions sources, then tells you how many people have reported it and what the callers claimed to be. Then do two more checks yourself: search the full number in quotes to see whether a real business publishes it, and never dial back the number that contacted you — if it claims to be your bank, hang up and call the number on the back of your card. A clean result is not proof the caller is safe, because scam numbers rotate every few days.

Yes — GACS runs entirely online, so the lookup works the same whether you are in the United States, Canada, the UK, Australia, or anywhere else. There is no office to visit, no app to install, and no signup: paste the number and check it against reported scam operations from over 100 countries.

Report it to GACS free — one click, no email, no signup — so the next person who searches the number sees the warning. Then file with your national authority: the FTC at donotcall.gov/report in the US, the Canadian Anti-Fraud Centre at 1-888-495-8501, Action Fraud in the UK, or Scamwatch in Australia. The country-by-country list is above on this page. If you already lost money, call your bank first — disputes are time-sensitive.

Yes. Scam calls cross borders constantly — a call that displays a local number is often placed from overseas with a spoofed caller ID. The GACS registry covers reported numbers worldwide, and the country-by-country reporting list above includes the US, UK, Canada, Australia, India, and the EU.