Domain Extractor — Extract & Count Domains from Emails
Point Domain Extractor at any list and get a ranked table of unique domains with occurrence counts. Optionally collapse subdomains into their registrable form — sub.example.org folds into example.org, while example.co.uk stays intact.
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- No signup · no uploads
- Free to use
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Results
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History
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How it works
- 01
Add your content
Paste text or drop TXT, CSV, XLSX, DOCX and PDF files into the workspace.
- 02
Run the tool
One press runs the pipeline locally in a Web Worker. Change the options and results update automatically.
- 03
Copy or download
Export results as TXT, CSV or JSON. Your content is never uploaded.
What a ranked domain table tells you
Point the extractor at any list and get every unique domain with occurrence counts, sorted by frequency. Instantly you see which companies dominate the list, how much sits on consumer mailboxes versus corporate domains, and where deliverability effort should concentrate — three domains holding 60% of addresses means three postmasters decide your reputation.
Sales teams use the table for account mapping (which companies appear most), marketers for B2B vs B2C splits, deliverability engineers for per-domain throttling plans, and data teams as a first-pass anomaly scan: an unexpected spike on one domain usually means a bot signup wave or a misconfigured import.
Subdomains, registrable domains and suffixes
With grouping enabled, mail.acme.com and app.acme.com fold into acme.com so per-company counts are honest. Multi-label public suffixes are respected — example.co.uk never collapses to co.uk, and com.au, com.br and similar suffixes behave correctly — because naive last-two-labels logic destroys Commonwealth and Latin American domains.
Leave grouping off when infrastructure matters: distinguishing transactional subdomains (bounce handling, dedicated IPs) from corporate roots is useful during deliverability forensics. Turn it on when people matter: headcount per company, account penetration, segment sizes.
- Grouped → per-company view for segmentation and ABM
- Ungrouped → per-host view for infrastructure forensics
- Suffix-aware → .co.uk, .com.au, .com.br stay intact
Pairing domains with analysis
The ranked table answers who; the Analyzer answers what it means. A domain table showing 40% Gmail plus an analyzer showing high disposable share describes a very different list than 40% Gmail with zero disposables — same headline number, opposite action. Run both, then decide whether the next step is validation, segmentation or a re-confirmation flow.
Export the table as CSV with counts for pivot tables, or feed the top domains into the workspace domain filter to carve out per-client or per-company sublists without touching the master copy.
Segmentation recipes
B2B isolation: keep registrable corporate domains, exclude consumer providers, sort by domain for manual review. Competitive cleanup: exclude a competitor's domains you keep accidentally collecting. Client reporting: group registrable, export CSV, and hand stakeholders a table instead of a raw address dump. Each recipe runs locally, so even sensitive account lists never cross the network.
Last reviewed: 2026-09-06 · By the Email Extractor Team · About our privacy-first approach
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Frequently asked questions
How are subdomains handled?
With grouping enabled, sub.example.org counts toward example.org. Multi-label public suffixes like co.uk, com.au or com.br are respected, so example.co.uk never collapses to co.uk.
Can I use this to segment B2B vs B2C?
Exactly — pair the ranked domain table with the Analyzer's provider breakdown to see how much of your list lives on consumer mailboxes versus company domains.
Does it count occurrences or just uniqueness?
Both: you see the unique domain set plus how many addresses pointed at each, sorted by frequency — instant signal on which companies dominate your list.