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Open-source Censys alternative

One open-source alternative to Censys, with its features, GitHub activity and licence.

The open-source alternative to Censys listed on Enlisted is IVRE.

IVRE is listed under security tools. It shipped code in the last 30 days and can be self-hosted.

Last updated October 2, 2026 · ranked by GitHub stars, growth and recent commits

IVRE

IVRE is a Python network reconnaissance framework that collects and analyzes scan and passive data, for building self-hosted alternatives to Shodan or Censys.

GitHub stars
4.2k
Last commit
yesterday
Latest release
v0.9.21
Licence
GPL-3.0
Self-hosted
Yes
ivre.rocksIVRE homepage screenshot

IVRE, a French acronym also read as Dynamic Recon of UNKnown networks, is a network reconnaissance framework with tools for both passive and active recon. It lets security teams build their own, fully controlled alternatives to services like Shodan, ZoomEye, Censys and GreyNoise.

It ingests data from passive sources such as Zeek, Argus, Nfdump, p0f and airodump-ng, and from active tools including Nmap, Masscan, ZGrab2, ZDNS, Nuclei, httpx, dnsx, tlsx and Dismap. Uses listed by the project include running a passive DNS service, assembling a tailor-made external attack surface management tool, and collecting and analyzing network intelligence from your own sensors. Topics reference Nmap result analysis and OSINT.

IVRE is written in Python and licensed under GPL-3.0, and runs on your own infrastructure. It suits security researchers and defenders who work on networks they are authorized to scan. As with any scanning tool, use it only where you have permission.

Key features

  • Passive recon from Zeek and p0f data
  • Active scanning with Nmap and Masscan
  • Integration with Nuclei and httpx
  • Passive DNS service capability
  • External attack surface management
  • Searchable network intelligence database

Pricing: Free and open source under GPL-3.0.

Censys alternatives: questions

What is the best open-source alternative to Censys?
IVRE is the only open-source alternative to Censys listed on Enlisted so far: IVRE is a Python network reconnaissance framework that collects and analyzes scan and passive data, for building self-hosted alternatives to Shodan or Censys.
Is IVRE free?
IVRE is open source, so the code is free to use under its licence, and it can be self-hosted on your own server or computer.
How does Enlisted rank Censys alternatives?
By a score built from GitHub stars, star growth over the last 30 days and how recently the code changed. IVRE shipped code in the last 30 days. Data is refreshed daily, and nobody can pay to move up.

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