Domain Extractor
Paste a list of URLs or hostnames and get root domains, subdomains and extensions, deduplicated and counted.
Privacy and cost
This tool runs in your browser. What you type or paste is not sent to our servers and it costs nothing to use.
How it works
- Paste your URLs or hostnames, one per line (or separated by spaces and commas).
- Each entry is parsed with the Public Suffix List: blog.example.co.uk gives example.co.uk, subdomain blog, suffix co.uk.
- Review the unique domains with their occurrence counts, the TLDs and a line-by-line detail, and export CSV.
Example
For 4 entries (www.example.com, blog.example.com, shop.example.co.uk, example.co.uk) you get 2 unique domains: example.com (2 occurrences, subdomains blog and www) and example.co.uk (2 occurrences, subdomain shop).
What the result means
The registrable domain (eTLD+1) is the name you can buy: example.com or example.co.uk. Splitting a hostname at the last dot fails with multi-level suffixes such as co.uk; the Public Suffix List gives the correct cut.
Common problems this tool helps with
- Counting domains by splitting on the last dot turns co.uk into a "domain".
- A backlink or external-URL list contains hundreds of duplicates that are hard to spot by eye.
- Subdomains (www, blog, m) inflate the number of "different" domains.
- IP addresses and names without a public suffix get mixed in with real domains.
Frequently asked questions
What is the registrable domain?
It is the root domain you buy from a registrar: a public suffix (com, co.uk, github.io…) plus one label. Anything to its left is a subdomain.
How are internationalized domains handled?
The tool converts names to punycode for parsing and shows their readable form (for example bücher.de).
Are my URLs sent to a server?
No. All processing, including the Public Suffix List, runs in your browser.
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