---
title: WHOIS Domain Data | Knowledge Base
description: Get started here with general questions about WHOIS and domain data in general.
---

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1. [Knowledge Base](https://knowledge.whoisxmlapi.com/)
2. [WHOIS Domain Data](https://knowledge.whoisxmlapi.com/whois-domain-data)

# WHOIS Domain Data

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

- [Where can I learn more about WHOIS-related terms?](https://knowledge.whoisxmlapi.com/whois-related-terms)
- [In which formats do WHOIS Database Download come?](https://knowledge.whoisxmlapi.com/what-formats-does-whois-database-download-come-in)
- [How do I receive WHOIS Database Download and NRD data?](https://knowledge.whoisxmlapi.com/how-to-receive-whois-database-download-and-nrd-data)
- [How often is the data on WHOIS Database Download updated?](https://knowledge.whoisxmlapi.com/how-often-is-the-data-on-whois-database-download-updated)
- [What is the retry logic for WhoisXML API's WHOIS and WHOIS-enriched products?](https://knowledge.whoisxmlapi.com/what-is-the-retry-logic-for-whoisxml-apis-whois-and-whois-enriched-products)
- [What are the different types of Top-Level Domains (TLDs)?](https://knowledge.whoisxmlapi.com/what-are-the-different-types-of-top-level-domains-tlds)

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## WHOIS vs. Historical WHOIS

- [Where can I check your latest current and historical WHOIS data stats?](https://knowledge.whoisxmlapi.com/whois-coverage-stats)
- [How far back do WHOIS history solutions go?](https://knowledge.whoisxmlapi.com/how-far-back-do-whois-history-solutions-go)
- [What is WHOIS History?](https://knowledge.whoisxmlapi.com/what-is-whois-history)

## Quarterly feeds

- [Where can I find detailed documentation on quarterly WHOIS Database releases?](https://knowledge.whoisxmlapi.com/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?](https://knowledge.whoisxmlapi.com/is-the-quarterly-database-a-snapshot-of-existent-domains-and-their-whois-data)
- [Why do quarterly data sets contain records with domains that ceased to exist?](https://knowledge.whoisxmlapi.com/why-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?](https://knowledge.whoisxmlapi.com/are-there-domains-where-both-registry-and-register-whois-data-exist-which-one-should-be-processed)
- [What data fields are included in WHOIS records?](https://knowledge.whoisxmlapi.com/whois-data-fields)
- [What are some of the use cases for different WHOIS record data fields?](https://knowledge.whoisxmlapi.com/use-cases-for-whois-record-data-fields)
- [What is “Registrar IANA ID”?](https://knowledge.whoisxmlapi.com/what-is-registrar-iana-id)
- [Do ccTLDs use the same Registrar IANA ID as gTLDs?](https://knowledge.whoisxmlapi.com/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?](https://knowledge.whoisxmlapi.com/more-than-one-registrar-iana-ids-appear-irregular-or-missing)
- [Why are there only a few non-empty fields in the WHOIS records?](https://knowledge.whoisxmlapi.com/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?](https://knowledge.whoisxmlapi.com/what-are-the-options-for-exporting-bulk-whois-lookup-results)

- [NRD2](https://knowledge.whoisxmlapi.com/nrd2#main-content)

    - [Tutorials](https://knowledge.whoisxmlapi.com/nrd2#tutorials)
- [General Support](https://knowledge.whoisxmlapi.com/general-support)
- [WHOIS Domain Data](https://knowledge.whoisxmlapi.com/whois-domain-data#main-content)

    - [WHOIS vs. Historical WHOIS](https://knowledge.whoisxmlapi.com/whois-domain-data#whois-vs-historical-whois)
    - [Quarterly feeds](https://knowledge.whoisxmlapi.com/whois-domain-data#quarterly-feeds)
    - [WHOIS data fields](https://knowledge.whoisxmlapi.com/whois-domain-data#whois-data-fields)
    - [Bulk WHOIS Lookup](https://knowledge.whoisxmlapi.com/whois-domain-data#bulk-whois-lookup)
- [DNS Data](https://knowledge.whoisxmlapi.com/dns-data)
- [APIs](https://knowledge.whoisxmlapi.com/apis#main-content)

    - [WHOIS API](https://knowledge.whoisxmlapi.com/apis#whois-api)
    - [WHOIS History API](https://knowledge.whoisxmlapi.com/apis#whois-history-api)
    - [DNS Lookup API](https://knowledge.whoisxmlapi.com/apis#dns-lookup-api)
    - [IP Geolocation API](https://knowledge.whoisxmlapi.com/apis#ip-geolocation-api)
    - [Email Verification API](https://knowledge.whoisxmlapi.com/apis#email-verification-api)
    - [Domain Reputation API](https://knowledge.whoisxmlapi.com/apis#domain-reputation-api)
    - [Subdomain Lookup API](https://knowledge.whoisxmlapi.com/apis#subdomain-lookup-api)
    - [Reverse WHOIS API](https://knowledge.whoisxmlapi.com/apis#reverse-whois-api)
- [Databases / Data Feeds](https://knowledge.whoisxmlapi.com/databases-data-feeds#main-content)

    - [Threat Intelligence Data Feeds (TIDF)](https://knowledge.whoisxmlapi.com/databases-data-feeds#threat-intelligence-data-feeds-tidf)
    - [IP Geolocation / IP Netblocks Databases](https://knowledge.whoisxmlapi.com/databases-data-feeds#ip-geolocation-ip-netblocks-databases)
- [Legacy](https://knowledge.whoisxmlapi.com/legacy)
- [Dev & Data Science Corner](https://knowledge.whoisxmlapi.com/dev-data-science-corner#main-content)

    - [Dev resources](https://knowledge.whoisxmlapi.com/dev-data-science-corner#dev-resources)
- [Domain Research Suite (DRS)](https://knowledge.whoisxmlapi.com/domain-research-suite-drs-1)
- [IP Data](https://knowledge.whoisxmlapi.com/ip-data)

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