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The Registration tab of a zone shows what the registry says about its registered domain, next to what DNZ serves: the registrar, the dates, every status with what it means, the nameservers and DNSSEC at the registry compared with the zone’s own, and the contacts the registry publishes.
A lookup on demand, for any zone, with expiry monitoring on or off. Nothing runs in the background for it. While monitoring is on, its daily check keeps this fresh too.

Look it up

On the zone’s page, Registration → Look up. Or from the terminal:
An answer less than an hour old is reused; a refresh still asks the registry at most once a minute.

What it shows

Most registries withhold contact details for privacy; those show as redacted. For a zone inside the registered domain (lab.example.com in example.com), the registry’s nameservers and DS are about example.com, so DNZ shows them without comparing.

RDAP, then WHOIS

DNZ asks the registry over RDAP. For a top-level domain without RDAP (some country domains) it falls back to WHOIS on TCP port 43, using the server IANA’s whois.iana.org names, and reads the usual fields from the answer, best effort. The tab says which one answered and, for WHOIS, shows the original text.

API

The answer holds info (the registry’s data, with source rdap or whois), statuses (each with epp, meaning and level), nameservers and dnssec (the comparisons, each with a note), checked_at, cached and error (why the last lookup failed; info then keeps the answer before).