What is 1Lookup?

1Lookup is a data verification and enrichment platform. One account, one
pool of credits, and every data product draws from it: phone validation,
carrier (HLR) lookup, reverse phone lookup, email verification and
enrichment, IP lookup, spam and risk scoring, DNC checking, website and
contact scraping, skip tracing, and more.

Use it three ways:

• Dashboard: run single lookups in the browser.
• Batch upload: upload a CSV and process thousands of rows at once.
• API: call any product from your own code, including a Bulk API for

high volume.

1Lookup is built for sales and marketing teams cleaning contact lists,
call centers and dialer operators, real estate investors skip tracing,
developers building verification into their product, and fraud teams
checking signups.

What 1Lookup is not

• Not a phone book. Reverse lookup returns the data our sources hold

for a number. Coverage varies, and some numbers return nothing. A
lookup that returns no data is a normal answer, not an error.

• Not Truecaller. We report network intelligence about a number

(valid, carrier, line type, ported, risk signals). We cannot see or
change how somebody's handset app labels your calls.

• Not a guarantee. Validation is a live, point-in-time check. A

number can be disconnected an hour after it checked valid. See
"How accurate are the results?" for the full picture.

• Not for harassment. Looking people up to stalk, harass, or defraud

them is against our terms and gets an account closed.

Try it free

• Free single-lookup tools on 1lookup.io work without an account.
• A free plan gives 25 credits per month.
• Every paid plan starts with a 7-day free trial.

Updated on: 24/08/2026