Reverse IP API to get all domains sharing an IP | WhoisXML API
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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.

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Monitoring
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WhoisXML API Predictive Threat Intelligence
Predictive Threat Intelligence

Detect and block access to and from dangerous domain names before malicious actors can weaponize them. 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.

Premium API Services
Premium API Services

Enjoy priority data access with our premium API services topped with extra perks including dedicated team support, enterprise-grade infrastructure, and SLAs for full scalability and high performance.

Multi-Level API User Administration Now Available - Manage individual API keys for team members in your organization.

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Reverse IP API reveals all domains that share an IP address in a single API call

Get a list of all domains associated with an IP address via API calls with outputs in JSON and XML formats.

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500 free API credits. No credit card required.

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

Benefits

  • Сomprehensive

    Determine infrastructure connections between hostnames and IP addresses using one of the biggest archives of Domain Name System (DNS) records today.

  • Fast

    Reverse IP & DNS API lets you query up to 10 IPs per second so you can quickly identify which domains are connected.

  • Handy

    Our Reverse IP & DNS API comes with code samples for easy integration in several programming languages. It’s also available as a Splunk Enterprise application.

What is a reverse IP API?

A reverse IP API is an intelligence consumption model with data delivery via API calls. The API establishes which domains might be using the same IP to host their websites’ contents. It allows website owners to check if their IP address is shared or dedicated and serves several purposes.

Practical usage

Cybersecurity research

Cybersecurity research

Identify all potentially dangerous domains that share the same IP with known malicious websites.

Penetration testing

Identify your attack surface by discovering all the hosts and IPs related to a given target website/IP address. You can also check if you have the same IP addresses as vulnerable websites with Reverse IP API. Further analysis is possible, too, with Reverse WHOIS API and Reverse WHOIS Search.

Incident response and threat intelligence

During or after an intrusion or incident, you can use Reverse IP capabilities to identify the attackers’ hostnames.

SEO and digital marketing

You can also use Reverse IP API to ensure that your website’s IP address is not being used by any other domain. That may lower your search engine ranking and move your site to a less reputable area of the Internet.

SEO and digital marketing
Web hosting reputation and oversubscription management

Web hosting reputation and oversubscription management

Hosting your website on a crowded IP address or one with a bad reputation due to malicious neighboring domains can negatively affect your website performance and how you are perceived on the web. It may even land you on a blacklist.

Domain asset management & brand protection

Our Reverse IP API enables you to conduct an inventory of all your websites or those of your competitors hosted on the same IP address. The API also helps with brand protection, as it can find other domains that potential attackers own and pinpoint otherwise-unknown related web properties that can cause harm.

Domain asset management & brand protection
DNS Database Download

Get access to the biggest Passive DNS Database

DNS Database Download is a large historical DNS record repository with several billions of historical DNS events as specified in our files covering A, MX, NS, TXT, CNAME, and SOA records.

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Reverse IP/DNS API | WhoisXML API

Get 500 free API credits. No credit card required.

Get started

Premium API Services

Our APIs are available in an enhanced version that offers better performance with a dedicated load balancer and a premium endpoint to enable faster throttling for large-scale API deployments.

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Enterprise API Packages

Reverse IP/DNS capabilities are only a part of our extensive set of APIs. Get complete access to domain, IP, and DNS intelligence with an annual WhoisXML API subscription.

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