IP Netblocks API | WhoisXML API

Get detailed information about the IP range a particular IP belongs to

With one API call get exhaustive information on the IP range that a given IP address belongs to, with detailed ownership information regarding each range.

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1,000 free API requests. No credit card required.

10.4 Million+IP Netblocks in total
21,800+Ranges updated daily
64,200+Unique ASNs
52,000+Satisfied customers

The IP Netblocks data we provide

We provide exhaustive IP netblocks data gathered and parsed from RWHOIS servers and RIR WHOIS data feeds (Regional Internet Registries). We determine the company, organization, and network records from different sources and combine them into a single data entry. For more info about provided fields see our API docs.

IP Netblocks API

Practical usage

Useful for Cyber Forensic analysis

Threat investigation and an essential component of any network security solution. Having IPs collected from your or your clients’ firewall logs, you can identify the networks where they have come from as well as their owners.

Trace malicious actors with contact & location details for the IP netblock.

Useful for Cyber Forensic analysis

SIEM data enrichment

  • Provide IP network intelligence (ownership information, ASN, location, etc.) across a variety of SIEM, Orchestration, Automation and Threat Intelligence Platforms.

Threat Defense

  • Threat analysts can monitor all IP addresses in a netblock containing one or more known malicious IP addresses, and build network behavioral profiles of all these IP addresses over time.
  • Safeguard an internal network from DOS attacks by blocking IP netblocks that have many known malicious IP addresses.
  • Block bad actors from misusing your infrastructure.
  • Block certain netblocks based on location.
  • Look up the owners of the IP addresses which attack your website.

Threat Hunting

  • Identify hijacked netblocks more-or-less in real time by getting daily updates for changes in the entire IP Netblocks database.
  • Enterprises can use IP netblocks database to understand their network attack surfaces.
Enrich your Marketing

Enrich your Marketing

By collecting IPs from your web server’s log and supplementing them with IP Netblocks whois data, you obtain a data set from which you can deduce the structure and dynamics of your traffic. Such information can have significant marketing implications, e.g. from which networks you are visited most frequently.

Merger and Acquisitions

Having a network you can possibly be interested in extending, by purchasing neighboring netblocks or find other free blocks for purchase.

Network Filtering and DRM

Provide access to your clients via network filtering (e.g. a software license or a journal subscription), you can identify their networks from netblocks data.

Brand Protection

Monitor your brand’s trademark or copyright and notify you of infringement when they are used on fraudulent network.

Cyber-security or business research

Address various interesting scientific research problems based on the observation of the structure and dynamics of netblocks.

Indicators of Compromise Enrichment

Enrich indicators of compromise (IoCs) within Threat Intelligence Platform, SIEMs with IP netblocks WHOIS data.

Business Intelligence and Marketing

Map visitors’ IP addresses to organizations to gain insights and provide personalized experiences as part of customized advertising campaigns.

Check which repositories of IP addresses and their ranges have become available.

IP Netblocks API | WhoisXML API

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IP Netblocks WHOIS Database

Get access to the biggest IP Netblocks WHOIS Database

We provide daily updated database of the registered IP Netblocks (IP ranges) with detailed ownership information regarding each range in the unified and consistent JSON or CSV formats.

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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

API access through WhoisXMLAPI can be purchased as an annual subscription. The access pricing is based on the number of queries, which is measured monthly with per-minute rate limits. The pricing structure gives predictability to business planning and solution architecture.

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