International Email Validator
Check Unicode addresses and convert them to punycode.
Email Domain Checker
See every domain in a list, ranked and classified.
Drop a .csv or .txt list here, or click to choose
Quick Tool Overview
The Email Domain Checker extracts every domain from a list, ranks them by address count, and classifies each as a free provider, a business domain, a known throwaway service or a reserved placeholder.
- What it does
- Ranks and classifies every domain in an email list
- You give it
- A list of addresses, or bare domains
- You get back
- A ranked table with counts, classes and TLD breakdown
- Classes used
- Free, business, disposable and reserved
- Best for
- Working out where a list actually came from
About the Email Domain Checker
Where does your list actually come from? Paste it and every domain is pulled out, counted and ranked, with each one classified as a free consumer provider, a business domain, a known throwaway service or a reserved placeholder.
It is the fastest way to spot the things a per-address check will not show you: one company domain making up a third of the list, a scrape that pulled in dozens of addresses from the same site, a handful of throwaway domains clustered around one signup date, or a top-level domain you did not expect to be selling into.
The top-level domain breakdown sits alongside it, which is a useful sanity check on any list that is supposed to be from one country.
Key features of the Email Domain Checker
Ranked by count
Every domain with its share of the list beside it.
Four-way classification
Free, business, disposable and reserved, each counted.
Top-level domain breakdown
A quick sanity check on where a list claims to be from.
Bare domains accepted
Paste domains directly, without addresses attached.
CSV export
Take the domain table into a report.
How to use the Email Domain Checker
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1
Paste your list
Addresses or bare domains — both work.
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2
Read the ranking
Every domain with its address count and share of the list.
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3
Check the classes
Free, business, disposable and reserved, counted separately.
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4
Export the table
Copy the domain breakdown as CSV for a report.
Frequently asked questions
Mostly where the list came from. A healthy signup list has a long tail of company domains and a broad spread of consumer providers; a scraped one clusters hard around a few domains, and a bought one often has a suspicious number of throwaways.
No. That needs a DNS lookup, which a browser cannot make without sending your domains to a third party. It classifies against bundled lists and checks the shape of the name.
Yes. Anything without an @ is treated as a domain, so you can check a list of domains directly.
It is a quick sanity check. A list that is meant to be UK subscribers and comes back 40% .ru was not built the way you were told it was.
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