A reverse email lookup turns an email address into everything behind it — the person's name, job title, company, LinkedIn profile, sometimes a direct phone. For B2B teams it's how you turn an inbound signup, a webform fill, or a list of bare email addresses into real, workable contact records.
This covers how reverse email lookup actually works, the best tools to do it in 2026, how to resolve an email to a LinkedIn profile (which got harder this year), and how to run lookups at scale inside Claude.
What is a reverse email lookup?
You start with an email address and get back the identity attached to it. In a B2B context, the common jobs are:
- Identify an inbound lead — someone signed up or booked a demo with just an email; you need their title and company to route and prioritize them.
- Enrich webform fills — turn "email only" form submissions into full records before they hit your CRM.
- De-anonymize a list — you bought or exported a list of emails and need names, companies, and roles attached.
- Find the LinkedIn or phone for an email you already have, so you can multichannel the contact.
How reverse email lookup works
A lookup tool matches the email against data sources — provider databases, public web data, and legally sourced professional profiles — and returns the identity behind it. Business emails on custom domains resolve far better than personal Gmail or Outlook addresses: leading B2B tools return useful data on work emails roughly 80–95% of the time. The strongest tools waterfall across several sources, so when one misses, the next fills the gap.
One caveat that matters in 2026: LinkedIn enforcement tightened after the Proxycurl shutdown in early 2025, and several tools quietly degraded their email-to-LinkedIn coverage. Tools that source LinkedIn data through partnerships and legal crawls — or that waterfall across many providers — hold up better than those that leaned on a single scraped source.
How to do a reverse email lookup
Three ways, depending on volume:
- One-off: paste the email into a lookup tool's web app and read the result.
- Bulk: upload a CSV of emails to a tool that supports batch enrichment and download the appended file.
- Inside Claude: connect an enrichment MCP and just ask. For example, with the FullEnrich MCP connected:
Reverse-lookup this email and return name, title, company and LinkedIn: jane@acme.com
The MCP approach is the one to use if you already work in Claude — see the full FullEnrich MCP walkthrough for setup and the credit math.
Best reverse email lookup tools in 2026
FullEnrich — best for B2B at scale
Turns any email into a full B2B profile — name, title, company, LinkedIn, phone — by querying 20+ providers in one call, at a ~80% hit rate, pay-per-success (you're not charged for misses). Works from the dashboard, the API, or inside Claude through its MCP, which makes it the most flexible option for teams running lookups at volume. Try it free with 50 credits.
- Best for: B2B teams enriching lists or inbound leads at volume.
Prospeo — best single-provider accuracy
300M+ professional profiles and a stated 98% email accuracy; turns a bare email into a complete contact profile with title, company, and direct data.
- Best for: teams that want strong accuracy from one provider.
Hunter — best for domain patterns
A domain-based finder and verifier. Less a pure reverse-email tool and more the thing you reach for once you've got the domain and want every contact on it.
- Best for: mapping a company's email pattern after an initial hit.
Reverse Contact — best for email-to-LinkedIn specifically
Built around email-to-profile, sourcing LinkedIn data through legal means including partnerships and public crawls.
- Best for: when the LinkedIn URL is the field you care about most.
Free options — Epieos and Mailmeteor
For occasional one-offs: Mailmeteor is free with no signup and returns name, title, and company for business emails; Epieos offers free basic email and phone reverse lookups and shows which platforms an email is registered on.
- Best for: a handful of manual checks, not pipeline work.
Quick comparison
| Tool | Best for | Coverage | Pricing model |
|---|---|---|---|
| FullEnrich | B2B at scale, in Claude | 20+ providers (waterfall) | Pay-per-success credits |
| Prospeo | Single-provider accuracy | 300M+ profiles | Credit / subscription |
| Hunter | Domain patterns | Domain-based | Freemium |
| Reverse Contact | Email → LinkedIn | LinkedIn-focused | Subscription |
| Epieos / Mailmeteor | Free one-offs | Limited | Free |
Email to LinkedIn: what changed in 2026
"Email to LinkedIn" is the hardest field to resolve, and it got harder. After the Proxycurl shutdown in early 2025, LinkedIn enforcement tightened and several tools lost or degraded their email-to-LinkedIn coverage. What still works reliably:
- Waterfall tools that try many sources, so a single provider's gap doesn't end the lookup.
- LinkedIn-specialist tools like Reverse Contact that source profile data through legal partnerships rather than one scraped feed.
If email-to-LinkedIn is core to your workflow, test your real hit rate on a sample of your own emails before committing — coverage varies a lot by geography and seniority.
Doing it at scale with Claude
If you live in Claude, connect an enrichment MCP and skip the dashboards entirely. With FullEnrich's MCP you can reverse-lookup a single email or enrich a whole CSV from the chat, preview matches before spending credits, and push results onward — all without a tab switch. The setup and credit details are in the FullEnrich MCP guide.
Verdict
For B2B work at volume, FullEnrich (especially in Claude) or Prospeo are the picks. For free one-offs, Epieos or Mailmeteor. If the LinkedIn URL is the whole point, use a waterfall tool or a LinkedIn-specialist like Reverse Contact, and verify the hit rate on your own data first.