Reverse IP API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address. These domains are ordered based on host.io domain ranking.

Advanced usage enabled

Group up to a thousand
lookups in one API request

Reverse API can be used with our /batch endpoint. It allows you to group up to 1000 API requests into a single request. This can really speed up processing of bulk IP lookups, and it can also be useful if you want to lookup information across our different APIs.

We needed to further contextualize Internet scanners, crawlers, and bots. Origin networks, data centers, ASNs, and countries are a huge component of that. We were looking for a faster, more developer-friendly alternative to existing geo-IP providers. A close friend of mine hit the IPinfo API with cURL, and I saw all the information we needed.

Andrew Morris — Founder / CEO, GreyNoise

Billion API requests last month

Improve your website's
performance or experience

Our API allows IPinfo customers to leverage their anonymous traffic into marketing and sales opportunities, combining our data with their own firmographics. For example, if your business serves differently to residential users, you can customize the experience for ISP-owned IP traffic on your website using the IP company data from our API response.

Name
Domain
Type

A few ways to use our
Reverse IP data

Enriching lead generation data and tightening-up sales reporting.
Having 24/7 access to resolving any IP address to domain name with Reverse IP reports.
Tracking down malicious behaviour of phishing or scamming websites that are sharing the same hosting server, identifying the true owners and operators of compromised infrastructure.
Uncovering new prospects by identifying owners of an IP address visiting your website and customising their experience.

Want to leverage the power of raw datasets? Try our Downloadable Database.

Our database downloads contain the same accurate IP address information available with our APIs. These downloads are available in any format (eg. CSV, JSON, MMBD) with additional options to customize the fields.

Read about data downloads

Made for developers
Trusted by enterprises

Our database is built, maintained, and supported by our in-house team of developers and engineers. These data experts are ready to troubleshoot problems, build unique use cases, and create additional enterprise solutions.

Supports integrations

Our API integrations merge the power of IPinfo’s proprietary IP address database with other industry-leading platforms. Use your IP WHOIS data at scale with our supported integrations, such as Snowflake, Splunk, Maltego, and beyond.

Official libraries

We offer libraries for the most commonly used programming languages and frameworks. Check out our documentation to facilitate easier setup.

Frequently Asked Questions

What is Reverse IP lookup (or IP to hosted domains)?

Reverse IP lookups reveal domains that are hosted on one IP address.

How many distinct domains can be hosted at a single IP address?

A single IP can host limitless domains.

Why are Reverse IP lookups important?

Reverse IP address lookups help cybersecurity develop threat intelligence by discovering associated domains that are tied to one IP address owner. Marketing teams and other organizations use Hosted Domains API to protect their domain reputation and site ranking.

What is the difference between Reverse DNS and Reverse IP lookups?

Reverse DNS lookups determine the hostname associated with an IP address. Reverse IP lookups reveal domains associated with an IP.

Industry-leading companies
around the world trust our APIs

Get started for free

We offer 50,000 free IP geolocation lookups per month. Sign up for free to test our data. No gimmicks or credit cards required.