COMPANIES · PEOPLE · VERIFIED WORK EMAILS
Find the company. Find the person. See how the email was verified.
Firmdex links every company to its people and every work email to a dated verification result. Use it in the app, by API, or from your AI agent.
See what's in the data →LIVE COUNTS
Updated
- Companies
- 180,629
- Industries
- 484
- Countries
- 202
ONE RECORD
Company, person and email verification arrive together.
Each result joins three sources. You always see which company a person works at and how their email was checked.
Company
+12 more attributes
Person
+9 more attributes
Email verification
+4 more attributes
Phone
COMING SOONDirect and mobile numbers are planned. Nothing is shown until they are real.
- PERSON
- Marta Voss
- COMPANY
- Northwind Labs
- JOB TITLE
- Head of RevOps
- marta.voss@northwind.example
- STATUS
- ✓ Valid
- PHONE
- Coming soon
PRODUCT
Everything you need to go from a market to a verified inbox.
Filters that match how you prospect
Combine company and people filters in one search. Every filter shows how many records it keeps.
- Industry
- Location
- Company size
- Technology
- Seniority · Director, VP
- Department
- Email status
Company profiles
Firmographics, technologies, locations and every linked employee on one page.
Northwind Labs
northwind.example · Berlin
Email verification you can read
Every email carries a status and the date it was checked.
- ✓ Valid
- ! Accept-all
- ? Unknown
- × Invalid
Email patterns
See how a company formats addresses, and whether its domain accepts all mail.
Lists and export
Save people and companies to lists. Export CSV with status and verified date included.
- name
- email_status
- verified_at
REST API
PLANNEDThe same search and verification endpoints the app uses.
GET /v1/companies/northwind.example
GET /v1/people?company=northwind.exampleMCP server
PLANNEDConnect Claude or another agent and query Firmdex in plain language.
- search_companies
- find_people
- verify_email
HOW IT WORKS
Three steps.
- 01
Filter companies
Pick industry, size, location and the technologies they run.
- 02
Find the right people
Use "Find people" on any company. Seniority and department narrow it down.
- 03
Verify and export
Reveal the email, check its status and date, then save or export.
AI WORKFLOW
Ask your agent. It calls Firmdex.
Connect the Firmdex MCP server to Claude or another agent. It can search companies, find people and verify emails with the same filters as the app.
- search_companies
- Filter by industry, size, location, tech
- find_people
- People at a company by role
- verify_email
- Status and verified date
Find SaaS companies in Berlin with 50 to 200 employees that use HubSpot.
- Northwind Labsnorthwind.exampleKreuzbergHubSpot
- Quellmarkquellmark.exampleMitteHubSpot
- Tidebrooktidebrook.exampleFriedrichshainHubSpot
+ 44 more matches
Northwind Labs fits best. Looking up their revenue leaders.
- Marta VossHead of RevOpsmarta.voss@northwind.example✓ Valid
- Deniz KayaVP Salesd.kaya@northwind.example! Accept-all
Sample data. Company and person names are fictional.
TRUST AND DATA SOURCES
Where the data comes from, and how to leave it.
How data is collected
Public company websites, business registries and professional profiles. Each record keeps its source and the date it was collected.
How emails are verified
Syntax check, domain and MX lookup, SMTP mailbox check, then a catch-all test. We never send an email to the address.
How people opt out
Anyone can remove their record with the opt-out form. We delete it and block it from returning in future updates.
Opt out / remove my data- [certification]
- [certification]
- [certification]
FAQ
Common questions
What is Firmdex?
Firmdex is a B2B company database for prospecting. It links every company to its people and every work email to a dated verification result. Teams use Firmdex in the web app, through the REST API, or from an AI agent over the MCP server.
What data does Firmdex have?
Firmdex has three linked record types. Company records hold details such as industry, employee range, founding year, headquarters, website and social media profiles. Person records hold a name, job title and seniority at the current company. Work email records hold the address, its verification status and the date it was checked.
Where does the data come from?
Firmdex collects its data from public sources: company websites, business registries and professional profiles that people have made public. Each Firmdex record keeps its source and the date it was collected.
How does Firmdex verify emails?
Firmdex verifies each work email with four checks: a syntax check, a domain and MX lookup, an SMTP mailbox check and a catch-all test. The result is one status (Valid, Accept-all, Unknown or Invalid), stored with the date of the check. Firmdex never sends a message to the address.
What does accept-all mean?
Accept-all means the company's mail server accepts every address on its domain, so a mailbox check cannot confirm that one specific person's mailbox exists. Firmdex marks these emails Accept-all. They may deliver, but they bounce more often than Valid emails, so send to them with more care.
How often is the data updated?
Firmdex updates its records in data releases, and the latest release is dated 2026-09-25. Each work email in Firmdex also shows the date of its last verification.
Does Firmdex have phone numbers?
Firmdex shows a company's main phone number when the company publishes one. Direct dials and mobile numbers for people are not available yet. They are on the Firmdex roadmap and will come with their own verification status.
Can I use Firmdex through an API or an AI agent?
Yes. The Firmdex REST API returns the same fields as the web app. The Firmdex MCP server lets Claude or another AI agent search companies, find people and verify emails with the same filters as the app.
How do I remove my data?
Anyone can remove their record from Firmdex with the removal form on the Our Data page. Enter the email address or profile URL that Firmdex holds. Firmdex confirms by email, deletes the record and blocks it from returning in later updates.
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