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Simple database of Czechia TLD domains which were registered in the past. You can search by its name to get its detail.
You can retrieve domain's archive.org status and WHOIS data but beware the capacity is limited when doing so. Submissions are welcome if the domain is not already in the database. Each submission is reviewed by the administrator.
czdomains is using IP2Location.io IP geolocation web service. The icons come from HTML Clipart by JAL Tech (archive link). Submitting domains is possible thanks to formspree.io.