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title: Databases / Data Feeds | Knowledge Base
description: Check this section for more information about databases and data feeds.
---

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1. [Knowledge Base](https://knowledge.whoisxmlapi.com/)
2. [Databases / Data Feeds](https://knowledge.whoisxmlapi.com/databases-data-feeds)

# Databases / Data Feeds

 Check this section for more information about databases and data feeds.

- [Where can I find specifications for all your databases and feeds?](https://knowledge.whoisxmlapi.com/database-specifications)
- [Which IP addresses and domains should I safe-list to download databases and data feeds (e.g., NRD2, typosquatting, DNS, etc.)?](https://knowledge.whoisxmlapi.com/which-ip-ranges-and-domains-to-safe-list-to-download-quarterly-databases-data-feeds)

## Threat Intelligence Data Feeds (TIDF)

- [Will a domain re-appear in TIDF daily files?](https://knowledge.whoisxmlapi.com/will-domain-re-appear-in-tidf)
- [Will there be a fresh file every day or will the file have to be cleaned up?](https://knowledge.whoisxmlapi.com/will-there-be-a-fresh-file-every-day-or-will-the-file-have-to-be-cleaned-up)
- [Why is the domain name file bigger than the URL file?](https://knowledge.whoisxmlapi.com/why-is-the-domain-file-bigger-than-the-url-file)

## IP Geolocation / IP Netblocks Databases

- [Why do IP data JSONL and CSV files have different sizes?](https://knowledge.whoisxmlapi.com/why-ip-data-json-csv-files-have-different-sizes)

- [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)
  
  
  
  
  
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    - [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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