Research
Original data on phone, email and IP quality
Two kinds of numbers live here, and nothing else. The platform's own aggregate lookup results, which nobody else can publish. And studies built from public data with the collection script committed to our repository, which anyone can re-run. Every figure names its sample, its window and its denominator.
Public-data study
Who Hands Out America's Phone Numbers in 2026
We counted all 198,436 assigned US phone number prefixes in NANPA's 1 October 2026 file: who holds them, who got the new ones since 2021, and which area codes are nearly full.
- Mobile, app and internet-calling, and traditional phone company shares
- Who got the new prefixes since 2021, by state and area code
- Area codes in relief planning and how many prefixes they have left
- Two CSVs: one row per state, one per area code
Read the report
Public-data study
The State of Email Authentication, September 2026
We checked SPF, DMARC, DKIM, BIMI, MTA-STS and TLS-RPT on the 5,000 most-visited domains and a 3,000-domain long-tail band. Enforcement, not publication, is where the gap is.
- DMARC published vs actually enforced, by traffic rank
- SPF records over the 10-lookup limit
- Which mailbox providers enforce
- Full CSV, one row per domain
Read the report
Live platform data
Contact Data Quality on the 1Lookup Platform
The share of phone numbers, email addresses and IPs that come back invalid, VoIP, disposable or anonymised across every lookup run on 1Lookup in the last 30 days. Refreshed hourly.
- VoIP, invalid and unreachable share of validated numbers
- Undeliverable and disposable share of verified emails
- Proxy, VPN and datacenter share of IP lookups
- Aggregate only, privacy floors applied
Read the live numbers
Right now on the platform
1.8%
of phone numbers validated came back as VoIP lines, last 30 days.
6.7%
of email addresses verified were undeliverable or risky, last 30 days.
13.9%
of IP addresses looked up came from a proxy, VPN exit or datacenter, last 30 days.
Every completed lookup on 1Lookup, 21 September to 20 October 2026 (UTC), the last 30 complete days.
What we publish, and what we do not
- Platform numbers are aggregate only. Counts and percentages across every completed lookup. No lookup input, no customer, no organisation. A product or bucket too thin to be anonymous is withheld rather than estimated, which is why some blocks are missing on some days.
- Platform numbers describe our traffic, not the world. A lead list a customer chose to verify is not a random sample of phone numbers. Every figure is framed as “numbers checked on 1Lookup”, never as a claim about all numbers, all emails or all IPs.
- Studies ship with their script and their raw rows. A public-data study is only worth citing if it can be checked. The collection script is committed to our repository, the per-row CSV is downloadable, and the page never computes a percentage the CSV cannot reproduce.
Who is behind the numbers: 1Lookup.io, the data verification platform that publishes this site. 1Lookup is part of the Momentum Labs group of companies and is the data partner for its sister brands (Prymatica, Emailchaser, VoiceDrop and ExpressNumber), which run their own verification through it.
Related: the daily briefing carries the platform's day-by-day numbers, and the glossary defines the frameworks these reports use.