Delimiter.live
Extraction Tools Runs in your browser Free · no account

Extract Domains from URLs

Extract domains from URLs, email addresses and raw text in one pass, returning a de-duplicated list. It can reduce each hostname to its registrable root domain so www, app and api subdomains collapse into a single entry. Everything runs in your browser.

Options
URLs, emails or text 0 characters
Domains

Your result will appear here.

Not sure where to start? Use Load example.

Results update automatically and are calculated on your device. Nothing you type is sent to a server.

Runs in your browser. Processing happens entirely in your browser. Nothing you enter is sent to Delimiter.live.

How to use the Domain Extractor

  1. Paste URLs, email addresses, or any text containing hostnames.
  2. Choose whether subdomains should be collapsed into the registrable domain.
  3. Copy or download the de-duplicated list.

Example

Input
https://blog.example.com/a
ada@mail.example.com
Output
blog.example.com
mail.example.com   (root mode: example.com)

Common use cases

  • Building an allow-list from a set of URLs.
  • Auditing which third-party domains a page loads resources from.
  • Summarising the domains present in a mailing list.
  • Preparing a list of hostnames for DNS checks.

Limitations and things to watch for

  • Reducing to the registrable domain uses a heuristic that understands common two-part suffixes such as .co.uk and .com.au. It is not a full Public Suffix List, so an unusual multi-part suffix may be split one label too far.
  • Internationalised domain names are returned as written, whether in Unicode or in punycode form.
  • IP addresses used in place of hostnames are not returned; use the IP address extractor for those.

Frequently asked questions

What is the registrable domain?
The domain someone actually registers, one label above the public suffix — example.com or example.co.uk. Collapsing to it merges www, api and blog subdomains into a single entry.
Does it handle .co.uk correctly?
Yes for the common two-part suffixes, including .co.uk, .com.au and .org.uk. Rare multi-part suffixes may not be recognised, because that would require the full Public Suffix List.
Does it extract domains from email addresses?
Yes. The part after the @ is treated as a hostname, so a mixed list of URLs and addresses works fine.

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