Email Domain Extractor

The Email Domain Extractor reads a list of email addresses and produces a tidy table of the unique domains they use, along with a count of how many times each domain appears. Results are sorted by frequency so the most common providers and companies rise straight to the top, giving you an instant breakdown of where the addresses in your list actually come from.

It is built for marketers, analysts, sales teams, and deliverability specialists who need to understand the makeup of a contact list before acting on it. Knowing which domains dominate helps with segmentation, suppression planning, spotting disposable or free providers, and estimating how many contacts sit behind a single corporate domain that you may want to target as one account.

Everything is computed locally in your browser using JavaScript, with no upload, no account, and no server processing involved. Paste your list, click Extract domains, and review the two-column table of domains and counts together with a couple of summary stats. Because your addresses never leave your device, you can analyse even confidential or sensitive lists with complete peace of mind.

Features

• Reads the portion after the at symbol in every address to identify the domain it belongs to.
• Counts how many times each unique domain appears across the entire list you provide.
• Sorts the resulting domains from most to least frequent so dominant providers appear first.
• Breaks ties between equally common domains alphabetically for a stable, predictable ordering.
• Lowercases domains before counting so the same domain in different capitalisation is never split.
• Accepts lists in any common separator, including new lines, commas, semicolons, spaces, and pipes.
• Reports summary statistics showing how many emails were scanned and how many unique domains were found.
• Exports the Domain and Count table to CSV or XLSX for further analysis in a spreadsheet.

How to use Email Domain Extractor

1. Paste your email list into the input box, using whatever separators your existing list already happens to use.
2. Click the Extract domains button to scan every address and tally the unique domains it contains.
3. Read the summary stats to see how many emails were scanned and how many distinct domains appeared.
4. Review the table, where the most frequent domains are listed first alongside their occurrence counts.
5. Identify any domains you want to segment, suppress, or investigate further based on their frequency.
6. Export the table to CSV or XLSX so you can build reports, charts, or suppression lists from it.

Benefits

• Reveals which email providers and companies dominate your list so you can plan targeted outreach.
• Supports segmentation and suppression decisions by surfacing the exact domains behind your contacts.
• Helps you spot disposable, free, or unwanted domains at a glance through their frequency counts.
• Lets deliverability teams gauge how concentrated a list is across a small number of large domains.
• Gives sales teams a quick view of how many contacts belong to each prospective company domain.
• Keeps your list private because all counting happens locally and nothing is ever uploaded anywhere.

This tool is especially useful before a major send or import, when understanding domain distribution can shape your strategy. For example, if a single corporate domain accounts for dozens of contacts, you might treat it as one account in a sales motion, while a heavy concentration of free providers might suggest a consumer audience. Analysts also use it to audit lists for disposable domains that tend to indicate low-quality signups.

The domain is taken from the text after the final at symbol in each address and lowercased before counting, so addresses written with different capitalisation are tallied together rather than split apart. Only the domain portion is analysed; the local part before the at symbol is ignored entirely. If you instead need the usernames, the Email Username Extractor isolates the part before the at symbol from the same kind of list.

All extraction and counting run locally in your browser with JavaScript, so your list is never transmitted to a server and nothing is stored after you leave the page, keeping sensitive data private. Keep in mind that the tool counts domains exactly as written and does not group related domains together, so a company that uses several distinct domains will appear as several separate rows rather than as one combined entry.