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Knowledge Base

WHOIS Domain Data

WHOIS Domain Data

Get started here with general questions about WHOIS and domain data in general.

What are the different types of Top-Level Domains (TLDs)?

Where can I learn more about WHOIS-related terms?

In which formats do WHOIS Database Download come?

How do I receive WHOIS Database Download and NRD data?

How often is the data on WHOIS Database Download updated?

WHOIS vs. Historical WHOIS

What is WHOIS History?

Where can I check your latest current and historical WHOIS data stats?

How far back do WHOIS history solutions go?

Quarterly feeds

Where can I find detailed documentation on quarterly WHOIS Database releases?

Is the quarterly database a snapshot of all existent domains and their WHOIS data?

Why do quarterly data sets contain records with domains that ceased to exist?

WHOIS data fields

Are there domains where both registry and register WHOIS data exist? Which one should be processed?

What are some of the use cases for different WHOIS record data fields?

What data fields are included in WHOIS records?

What is “Registrar IANA ID”?

Do ccTLDs use the same Registrar IANA ID as gTLDs?

Occasionally I see more than one Registrar IANA ID appear in one single domain name WHOIS record. Sometimes the IANA ID looks irregular or even missing. What should I do about it?

Why are there only a few non-empty fields in the WHOIS records?

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Bulk WHOIS Lookup

What are the options for exporting Bulk WHOIS Lookup results?