Email Domain Counter

The Email Domain Counter breaks a list of addresses down by domain and tells you exactly how many contacts sit behind each one. Instead of scrolling through hundreds of raw addresses, you get a compact table pairing every unique domain with its count, so you can immediately see which companies, providers, or organisations dominate your list.

This view is useful for all sorts of analysis. A high concentration of a single business domain might signal a strong account worth a dedicated campaign, while a large share of free providers like gmail.com or outlook.com tells you the list leans consumer. Spotting these patterns before you send helps you segment sensibly, tailor messaging, and plan sending volume so you do not overwhelm any single mail provider.

Everything runs locally in your browser using JavaScript, with no upload and no account. Paste or upload your addresses, choose whether to rank domains by count or alphabetically, and read the results with a summary of emails scanned and unique domains found. Because your data never leaves your device, even confidential lists can be analysed with complete privacy.

Features

• Extracts and normalises the domain from every address so counting is accurate regardless of capitalisation.
• Produces a table pairing each unique domain with the number of addresses that use it.
• Ranks domains by frequency so the most common ones appear at the top for quick scanning.
• Offers an alphabetical sort option when you would rather browse domains by name.
• Summarises the analysis with total emails scanned and the number of unique domains found.
• Ignores surrounding text and punctuation, so you can paste raw content without pre-cleaning.
• Exports the domain table to CSV, XLSX, or TXT, or copies it to the clipboard for reporting.

How to use Email Domain Counter

1. Paste your email addresses into the input box, or upload a .txt or .csv file from your device.
2. Choose whether to sort the results by count, showing the busiest domains first, or alphabetically.
3. Click the Count domains button to group every address by its domain.
4. Review the table to see how many addresses belong to each domain in your list.
5. Read the stats panel for the total emails scanned and the number of unique domains found.
6. Export or copy the domain breakdown for use in a report, spreadsheet, or segmentation plan.

Benefits

• Reveals which companies and providers dominate a list so you can target high-value accounts.
• Helps you gauge whether a list leans business or consumer by the share of free-provider domains.
• Supports smarter sending by showing where volume is concentrated across mail providers.
• Turns a long address list into a concise, sortable summary you can act on immediately.
• Keeps confidential lists private because all counting happens in your browser only.
• Provides quick metrics for reports without exporting anything to an external analytics service.

Domain counting is a fast way to understand the shape of any list. When a handful of company domains account for a large share of your contacts, you have effectively found your key accounts and can plan account-based outreach around them. When free consumer providers dominate, you know the list is broad and consumer-oriented, which affects everything from tone to sending cadence and warm-up strategy.

The counter groups by the full domain, so mail.example.com and example.com are treated as distinct entries, which is usually what you want for accuracy. If you need the significant company name behind each domain rather than the raw host, pair this with the Email Provider Checker, which maps consumer domains to friendly provider names. To pull just the domains as a list, use the Email Domain Extractor.