Bulk Root Domain Extractor

How to use

1. 1Paste your URLs into the input area. Line breaks, commas, semicolons, tabs, and whitespace all work as separators. Load a sample if you want to see the output shape.
2. 2Tick the options that match how you want hosts merged: Treat www. as no subdomain, Lowercase the host, Include IP addresses, and pick a scheme filter (Any, http, https, or http or https).
3. 3Switch between Unique root domains (with sort by count, name, or first seen), Per-URL breakdown (with the original URL plus root, subdomain, and TLD per row), and Subdomains by root (grouped lists).
4. 4Pick the output format: plain list, list with counts, CSV (RFC 4180 quoting), or JSON. Each view has its own copy button.
5. 5If any rows could not be parsed, fix or remove them from the input and the totals update live. The Could not parse banner lists the first ten skipped inputs with the reason.

About this tool

Bulk Root Domain Extractor takes a list of URLs (line breaks, commas, semicolons, tabs, or any whitespace work as separators) and pulls out the registrable domain (eTLD+1) for every entry, then deduplicates the result. The hostname is walked right to left and matched against a curated subset of the IANA Public Suffix List so that multi-part country suffixes like .co.uk, .com.au, .co.jp, .com.br, and .co.za return the right registrable domain instead of collapsing to a single label. The list also includes the 'private' effective TLDs from the PSL where every customer registers their own subdomain (github.io, vercel.app, netlify.app, pages.dev, web.app, herokuapp.com, azurewebsites.net, myshopify.com, substack.com, and more), so alice.github.io and bob.github.io count as separate sites the way SEO and analytics tools treat them. Three views render from the same parse pass: Unique root domains shows a deduplicated list sorted by count, name, or first-seen order with a copyable plain list, list-plus-count, CSV, or JSON output; Per-URL breakdown shows the original URL, root domain, subdomain, TLD, and scheme for every row plus a separate bucket for inputs that could not be parsed; and Subdomains by root groups every unique subdomain under its parent root domain. A leading www. subdomain is collapsed into the root by default so example.com and www.example.com end up in the same bucket, and hostnames are lowercased so EXAMPLE.com matches example.com, matching the way visits are merged in Google Analytics, Cloudflare Analytics, Plausible, and search consoles. Bare hosts like example.com/path are auto-prefixed with https:// before parsing so a copy paste from a spreadsheet or chat message just works. IPv4 and IPv6 hosts are passed through unchanged, and a scheme filter narrows the result to http only, https only, http or https only, or any. Useful for SEO backlink list dedup (turn a list of 800 referring URLs into the 120 unique referring domains underneath), marketing campaign URL cleanup, cookie scoping audits (which registrable domain does a cookie apply to?), CORS allowlist construction, vendor and tracker inventory, security log analysis where one row per source domain is more useful than one row per request, and any time you need to ask 'how many distinct sites does this list of URLs represent?' Everything runs in your browser; the URL list, parsed hostnames, and output never leave your device, which matters because referrer lists, internal URLs, and customer-facing backlink reports are often sensitive.

Free to use. Works in your browser. No signup, no login.