What Intelligence X does

Intelligence X is a privately-held technology company headquartered in Prague, Czech Republic, operating under the legal entity Kleissner Investments s.r.o. The company was founded by CEO Peter Kleissner and maintains a small team (1-10 employees). It runs a specialized open-source intelligence (OSINT) search engine accessible at intelx.io that indexes and searches across more than 200 billion records spanning over 20 data categories, including darknet (Tor and I2P), public and private paste sites, public and combo leaks, stealer logs, WikiLeaks, Usenet, Whois records, DNS records (over 204 million indexed), and geographically segmented public web archives across 573 supported TLDs. Rather than full-text search, the platform accepts selectors — emails, domains, URLs, IPs, CIDRs, phone numbers, and cryptocurrency addresses — as inputs for targeted investigations, positioning the product for security researchers, threat intelligence analysts, law enforcement agencies, incident responders, and academic institutions.

The product surface comprises the core Intelligence X Search Engine, the Identity Portal (with the Leaks API) for analyzing leaked accounts and stealer logs with reverse-lookup and bulk export capabilities, the Search API for third-party integration (segmented into public, free, and paid instances), the phonebook.cz email and subdomain discovery service, and a free OSINT Tools suite that aggregates email validation, domain/IP lookups, reverse image search, file analysis (Magic File Tool), encoding utilities, and social media search. The platform maintains two API products (Search API and Leaks API), each with documented instances and licensing requirements, and offers a Tree View API endpoint for linking stealer logs, container files, and archived website copies.

The business model is a pure product-led growth, self-serve subscription offering priced annually only — there is no sales team, no meetings, and no telephone support. Revenue derives from tiered subscriptions (a free tier limited to 50 lookups per day with restricted bucket access; a Researcher paid tier at 200+ lookups per day with full bucket access and priority email support) and the paid Phonebook add-on. The Academia Program automatically upgrades verified university email domains to a free limited-tier license across more than 100 country-specific educational TLDs, serving as a long-tail acquisition channel. Pricing is publicly disclosed and excludes VAT for EU customers outside the Czech Republic. The company is bootstrapped with no disclosed funding rounds, no parent company, and no institutional investors identified in the source material.

Name

Intelligence X

Legal name

Kleissner Investments s.r.o.

Website

https://intelx.io

Company type

Private

Founded year

2018

Operating status

Operating

Headcount range

1–10 employees

Short description

Intelligence X is a Prague-based OSINT search engine indexing 200+ billion records across darknet, leaks, stealer logs, DNS, and public web sources. It serves security researchers, threat intelligence analysts, law enforcement, and academics via a self-serve, annual-subscription platform with no sales team.

Ownership category

akta.pro rank

Product category

OSINT Search Platform

NAICS

Web Search Portals and All Other Information Services (51929), Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (5182)

SIC

Services-Computer Programming, Data Processing, Etc. (7370), Services-Computer Processing & Data Preparation (7374)

akta.pro primary industry

Digital/Online Investigations & OSINT (Non-cyber) (BPAKAEAF)

Keywords

• OSINT search engine
• Threat intelligence platform
• Darknet data search
• Leaked credentials monitoring
• Selector-based search

Headquarters

HQ city

Praha

HQ country

Czechia

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Infrastructure, Personnel, Operations

Revenue model

1. Search Engine Subscription: Yearly subscription-based access to the OSINT search engine with tiered lookups per day. Paid users get priority support and access to all data buckets including restricted ones like private leaks and stealer logs.
2. Phonebook (paid addon): Separate paid feature for discovering email addresses, subdomains, and URLs associated with domains. Available at phonebook.cz

Pricing tiers

Go-to-market motion1 record

Distribution channels5 records

Marketing channels4 records

Core offering

Intelligence X is a specialized open-source intelligence (OSINT) search engine that indexes and queries across multiple data categories including darknet (Tor, I2P), pastes, leaks, stealer logs, Whois, Usenet, WikiLeaks, DNS records, and public web archives. It uses selectors (emails, domains, IPs, CIDRs, phone numbers, crypto addresses) rather than full-text search, and offers complementary interfaces including the Identity Portal for leaked account analysis and the Search/Leaks APIs for programmatic integration.

Product overview

Intelligence X is an OSINT (Open Source Intelligence) search engine platform specialized for investigations and threat intelligence. The core offering is the Intelligence X Search Engine, which indexes and searches across multiple data categories including darknet (Tor, I2P), leaks, stealer logs, DNS records, Whois, Usenet, WikiLeaks, public web, and paste sites. The platform provides a complementary Identity Portal (Leaks API) for detailed analysis of leaked accounts and stealer logs with export capabilities. Programmatic access is available via the Search API and Leaks API for integration into third-party products. A free OSINT Tools collection provides investigator-focused utilities including reverse search for various selectors, social media tools, file analysis, and encoding tools. The Academia Program offers limited free access to educational institutions.

Differentiator

Problem solved

Functional benefit

Products and services

• Intelligence X Search Engine A computer program that finds information on the internet specialized in open-source intelligence (OSINT). Searches across multiple data sources including darknet (Tor, I2P), leaks, stealer logs, DNS records, Whois data, Usenet, WikiLeaks, public web, and paste sites. Designed for security researchers, law enforcement, and threat intelligence analysts.
• Identity Portal A specialized interface at identity.intelx.io for searching leaked accounts and stealer logs. Offers search results by line with search term highlighting, Export Leaked Accounts functionality, and Reverse Lookup for Stealer Logs to identify all leaked accounts for a particular domain or URL. Targeted at incident responders and digital forensics professionals.
• Search API Programmatic API for searching Intelligence X's indexed data across darknet, leaks, DNS, pastes, Whois, Usenet, and public web sources. Available in three tiers: public.intelx.io for non-registered users, free.intelx.io for free registered users, and 2.intelx.io for paid users. Integration into third-party products requires API or higher license.
• Leaks API API used by the Identity Portal (identity.intelx.io) for searching leaked accounts and stealer logs data. Documentation is linked within the Identity Portal. Available to users with API license or higher.
• OSINT Tools A collection of free Open Source Intelligence and forensic tools including general search engines, email/domain/IP/Bitcoin/username lookup, image reverse search, person lookup, phone number search, location mapping, VIN lookup, reverse hash lookup, Google Analytics/AdSense ID lookup, social media tools (Facebook, Twitter, LinkedIn, Telegram, YouTube), Magic File Tool, encoding/decoding, and GeoIP lookup.
• Academia Program Limited free access program for schools and universities. Automatically upgrades accounts with eligible institutional email domains (supporting 100+ country-specific educational domains) to an 'Academia' license with access to most features except Bot Logs and Private Leaks categories.
• phonebook.cz A service for discovering email addresses, subdomains, and URLs associated with a domain. Available to paid users via phonebook.cz. Functions as a standalone product for targeted reconnaissance and OSINT investigations.

Named customers4 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

AI capability5 records

Feature6 records

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Censys: Censys provides internet scanning and host intelligence with an API, used for threat hunting and asset discovery — overlapping with Intelligence X on the DNS/Whois and exposed-systems use cases for security teams.
• DomainTools: DomainTools provides Whois, DNS, and domain intelligence — a partial but direct overlap with Intelligence X's Whois and DNS categories, serving similar security and investigation professionals.
• Have I Been Pwned: Have I Been Pwned indexes breach data and leaked credentials with API access, serving a similar investigator/breach-awareness audience though with a narrower scope than Intelligence X.
• DarkOwl Vision: DarkOwl offers a darknet and OSINT search engine that indexes Tor, I2P, and leak data with selector-based search — directly comparable to Intelligence X's core product and customer base in security research and law enforcement.
• SpyCloud: SpyCloud specializes in stealer logs, exposed credentials, and infostealer data with enterprise APIs — overlapping directly with Intelligence X's Identity Portal/Leaks API and incident-response use cases.
• DeHashed: DeHashed provides a search engine for leaked credentials, breach data, and stealer logs with similar selector-based queries, closely mirroring the Intelligence X Identity Portal and Leaks API use cases.
• Shodan: Shodan is an internet-wide search engine for exposed devices and services with a subscription API — a comparable search-as-a-service model targeting similar security researcher and enterprise audiences.
• LeakCheck: LeakCheck offers credential and leak lookup services with API access, overlapping with Intelligence X's Identity Portal use cases for security researchers and individual investigators.
• Flashpoint: Flashpoint delivers OSINT, darknet, and threat intelligence with breach data and forum coverage, targeting the same security researcher, fraud, and law enforcement buyers as Intelligence X.

Broad incumbents

• Recorded Future: Recorded Future is a large threat intelligence platform covering dark web, OSINT, and breach data alongside analyst services — overlapping with Intelligence X at the data layer but competing in enterprise deals with much broader capabilities.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/Info_IntelX
• LinkedInlinkedin.com/company/intelxio

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Intelligence X