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WHOIS / WHOIS History
WHOIS / WHOIS History

Provide current and historical ownership information on domains / IPs. Identify all connections between domains, registrants, registrars, and DNS servers.

DNS / DNS History
DNS / DNS History

Look into all current and historical DNS / IP connections between domains and A, MX, NS, and other records. Monitor suspicious changes to DNS records.

IP Geolocation / IP Netblocks
IP Geolocation / IP Netblocks

Get detailed context on an IP address, including its user’s geolocation, time zone, connected domains, connection type, IP range, ASN, and other network ownership details.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Access our web-based solution to dig into and monitor all domain events of interest.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Get access to a web-based enterprise-grade solution to search and monitor domain registrations and ownership details for branded terms, fuzzy matches, registrants of interest, and more.

New gTLD Intelligence Services (NGIS)
New gTLD Intelligence Services (NGIS)

Independent, evidence-based DNS and abuse intelligence for applicants, advisors, governments, and counsel participating in the ICANN 2026 New gTLD Program.

Research
Monitoring
White-Label
Predictive Threat Intelligence Feeds
Predictive Threat Intelligence Feeds

Predictive threat intelligence is your best first line of defense. Subscribe to the feeds to strengthen your cybersecurity posture. Contact us today for more information.

WhoisXML API Internet Infrastructure
Internet Infrastructure

Unlock integrated intelligence on Internet properties and their ownership, infrastructure, and other attributes.

Enterprise API Packages
Enterprise API Packages

Our complete set of domain, IP, and DNS intelligence available via API calls as an annual subscription with predictable pricing.

Security Intelligence (SI) Suite
Security Intelligence (SI) Suite

Offers complete access to WHOIS, IP, DNS, and subdomain data for product enrichment, threat hunting and more.

Attack Surface Discovery API
Attack Surface Discovery API

Uncover entire attack surfaces with this API to embed asset discovery, vulnerability scanning, and technology metadata into your platform. Now in early access.

MCP Server
MCP Server

Talk to our APIs using LLMs. Connect your preferred LLM to WhoisXML API and simply chat about WHOIS, DNS, threat intelligence, and more.

Jake AI
Jake AI

I’m your Domain Intelligence Assistant. I make it easy to explore WHOIS, DNS, and threat data from WhoisXML API — I’m cloud-based, fast, and always ready to help.

WhoisXML API Domain Intelligence Advisor (via ChatGPT)
WhoisXML API Domain Intelligence Advisor (via ChatGPT)

A custom GPT for WHOIS, DNS, IP, and threat intelligence research. Connects ChatGPT directly to WhoisXML API to enable fast, conversational investigations and domain insights.

Discover what you really pay for when buying commercial Internet intelligence data.

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Reverse IP Lookup: Obtain a List of the Domains with the Same IP Address

Reveal the domain names sharing an IP address and their first-seen and last-seen dates on the DNS. Test our Reverse IP Lookup now. Download our product sheet to learn more.

50 Billion+Domains and subdomains
116 Billion+"A" records
99.5%of IP addresses in use
52,000+Satisfied customers

Why use our Reverse IP Lookup tool?

  • Backed by comprehensive data

    With a reverse IP address lookup, lists of connected domains are retrieved from the largest historic IP/DNS database built from over a decade of data crawling.

  • Outputs in a matter of seconds

    The lookup service can identify thousands of domains that share the same IP address in near real-time for immediate investigations and incident response.

  • Easy-to-interpret results

    Reverse IP Lookup’s hosted reports are made available with report URLs that can easily be shared with colleagues, clients, and other relevant stakeholders.

Practical usage

Cybersecurity

Cybersecurity

  • Sever ties to malicious activities by checking for connections between your IP addresses and dangerous domains. Keep cybersecurity risks to a minimum and reduce the potential attack surface with Reverse IP Lookup’s comprehensive outputs.
  • Make sure that none of your prospective or current suppliers, business partners, customers, or any other third parties could drag you down because of an IP connection to a malicious domain.
  • Steer clear from any domain tied to an IP address that has been linked to phishing, spamming, and other cybercriminal activities.

SEO & marketing

  • Do you share IP addresses with other parties? Make sure that none of them suffer from oversubscription with Reverse IP Lookup. Too many domains on the same IP address can slow down your site and harm your email deliverability.
  • With just their IP addresses on hand, you can analyze your competitors’ connected domain infrastructure to find out about recent site acquisitions and domain registrations that may be indicative of future business expansion.
SEO & marketing
IT planning

IT planning

  • Use Reverse IP Lookup in combination with other tools to make informed decisions about your IP/domain infrastructure.
  • You can make accurate inventories of all the sites hosted on the same IP addresses that belong to your company and decide whether to purchase new IP addresses, discard old ones, or shift domain names from one IP address to another to avoid low performance.
  • Study all recently acquired IP addresses and their connected domains following a merger, acquisition, or joint venture to make sure none of them have malicious connections that could affect your business.
  • Follow up on reports of abuse concerning IP addresses you manage and spot problematic domain names with Reverse IP Lookup.
DNS Database Download

Access all the passive IP/DNS data you need

We built the most comprehensive DNS database with data covering billions of DNS records, including domains and subdomains’ A, MX, NS, TXT, CNAME, PTR, and SOA records, for over a decade.

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