Lookups.io vs 1Lookup: Which Lookup Service Do You Need?
Similar names, different jobs. One searches for people; the other verifies phone numbers, emails, and IP addresses. Two minutes here will save you signing up for the wrong one.
Lookups.io positions itself as a people search engine: you start with a name and get aggregated public information about a person. 1Lookup (this site) is a data verification platform: you start with a phone number, email, or IP address and get technical facts about it (validity, carrier, line type, spam score, and fraud risk) via free tools and a developer API. The two services are not affiliated.
Start with what you're trying to do
“I want to research a person”
A people search engine is the right category. Lookups.io is one of many services in that space, alongside long-standing names in public-records search. We're not in that business, so we won't pretend to review it: check independent reviews and each service's privacy policy, and prefer services that show what they found before asking for payment.
“I want the story behind a number, email, or IP”
That's 1Lookup. Paste a phone number and see whether it's real, who carries it, whether it's mobile, landline or VoIP, whether the SIM is live right now (HLR), and its spam reputation, or run a reverse lookup for the likely owner's name and location. Same idea for emails (deliverability) and IPs (geolocation, VPN/proxy detection). Free for single lookups, with an API when you need volume.
Side by side
| Lookups.io |  1Lookup | |
|---|---|---|
| Type of service | People search engine | Phone, email & IP verification platform (API + free tools) |
| You start with… | A person (typically a name) | A data point: phone number, email address, IP, or domain |
| You get back… | Aggregated public information about individuals | Technical facts: validity, carrier, line type, HLR reachability, spam score, deliverability, geolocation, fraud risk |
| Built for | Consumers researching people | Businesses and developers cleaning lists, verifying signups, and blocking fraud, plus anyone identifying an unknown number |
| Free access | See lookups.io for its current terms | 13+ free tools, no account needed; free account adds 1,000 lookups, bulk uploads & API |
| API for developers | Not its positioning | Yes: REST API, bulk processing, integrations (Zapier, n8n, Sheets) |
Lookups.io column describes its public positioning as a people search engine; for current features and terms, see its own site. 1Lookup has no affiliation with Lookups.io.
Try the free 1Lookup tools, no signup needed
If you landed here trying to figure out an unknown number or verify a contact, these run the same production API our customers use, free for single lookups:
Reverse Phone Lookup
Likely owner name, city, and line type for US numbers.
Spam Number Lookup
Spam, scam and robocall reputation for any number.
Phone Number Lookup
Validity, carrier, country and timezone in seconds.
HLR Lookup
Is a mobile number active and reachable right now?
Email Verifier
Is an address valid, deliverable and safe to send to?
IP Address Lookup
City, ISP, ASN and connection type for any IP.
Live network data
Phone results draw on carrier data, live HLR queries, and FCC daily data, not a static directory.
Built for compliance
Validation and verification only: technical facts about numbers, emails and IPs, used under TCPA/DNC-aware practices.
Verified pricing culture
Our comparison pages publish competitor prices verified against live sources, and the same honesty applies here.
Frequently asked questions
Are 1Lookup and Lookups.io the same company?
No. 1Lookup (1lookup.io) and Lookups.io are separate, unaffiliated services with different purposes. Lookups.io positions itself as a people search engine for finding information about individuals by name. 1Lookup is a data verification platform: an API and set of free tools that validate phone numbers, email addresses, and IP addresses for businesses and developers.
Is Lookups.io legit?
We can't vouch for another company's service: 1Lookup is not affiliated with Lookups.io and doesn't have inside knowledge of how it operates. As with any people-search site, sensible precautions apply: check independent reviews, read the privacy policy before submitting personal data, and be wary of any service that requests payment details for results it can't preview. If your actual goal is to check who or what is behind a phone number, you can run a free reverse phone lookup on 1Lookup without creating an account.
What is the difference between a people search engine and a lookup API?
A people search engine starts from a person (typically a name) and aggregates public records and web data about them. A lookup or validation API starts from a data point (a phone number, email address, or IP) and returns technical facts about it: whether it's valid and active, its carrier or mail server, line type, spam reputation, and fraud risk. Businesses use lookup APIs to clean contact lists, verify signups, and block fraud rather than to research individuals.
Can 1Lookup tell me who owns a phone number?
1Lookup's reverse phone lookup returns the likely owner name, city, state, and line type for US numbers, alongside carrier and spam-risk data. It's built for caller identification and list hygiene, not for people research: it returns details about the number, not a dossier about the person. You can try it free at 1lookup.io/tools/reverse-phone-lookup.
Does 1Lookup offer free lookups?
Yes. 1Lookup's free tools cover phone validation, reverse phone lookup, carrier lookup, HLR checks, spam number lookup, email verification, IP lookup, and more, one lookup at a time, no account required. Creating a free account unlocks full reports, bulk list processing, and API access with 1,000 free lookups to start.