Most people think of Google when it comes to search engines, but cybersecurity researchers have a completely different set of search tools designed not to search web content, but rather to locate physical devices that are connected to the internet. Shodan is the most well-known name in this area, but if you've been around the cybersecurity community for a while, you'll notice that Censys is often mentioned alongside it.
Censys performs tasks similar to Shodan
Censys continuously scans the entire range of IP addresses on the internet, recording which ports are open, what services are running, and what credentials are used for each address, organizing this information into a searchable database. By entering keywords, users can find devices that meet specific criteria, such as a particular model of router, exposure of cameras on the internet, or improperly configured database servers. This operational logic is almost identical to Shodan; both are categorized as tools known in the cybersecurity community as internet space search engines.
The differences lie in scanning frequency and data presentation
Although the core logic is similar, the two have taken different paths in detail. Censys typically has a higher scanning frequency and faster data update speeds, making it more sensitive in tracking vulnerabilities or configuration changes that arise in a short time. Additionally, Censys places special emphasis on credential analysis capabilities, providing deeper analysis and related queries for SSL/TLS certificates, which is a practical feature for those researching phishing website infrastructures or tracking malicious server clusters. Shodan, on the other hand, has invested more time in the usability of its user interface and search syntax, and its community resources and documentation are relatively richer, making it slightly less daunting for newcomers.
The purpose of these tools is to help identify forgotten exposed devices
When a company manages thousands of devices internally, it’s easy for things to be forgotten in the corners—such as a test server with its remote management interface left open or a monitor that has never had its default password changed, connecting directly to the company network. Cybersecurity teams regularly use tools like Censys or Shodan to search their own company's IP range to identify which devices are accidentally exposed to the public internet, patching them before malicious scanners can discover them. This usage is known as attack surface management and is a common practice in corporate cybersecurity maintenance.
Should average users worry about being found?
If you have smart cameras, routers, or other connected devices at home, it is theoretically possible for them to appear in such search results, provided they are directly exposed to the public internet and their default passwords have not been changed or unnecessary remote access features have not been disabled. A more practical way to protect oneself is to regularly check whether the remote management settings on your home router truly need to be enabled and to change the default passwords on all connected devices to unique strong passwords. These actions take very little time but can greatly reduce the likelihood of being randomly scanned. VexelOps, in assisting users to understand such cybersecurity tools, consistently maintains the stance of clarifying the technical principles, allowing users to assess their own risks and check for themselves, rather than creating a sense of panic. These tools are neutral; what truly determines their usage is the user's intent. Which is better, Censys or Shodan, partly depends on the usage context and personal habits, with cybersecurity professionals often using both depending on current needs. For average readers, understanding that such
One Key Takeaway: Both Censys and Shodan are internet space search engines, with differences in scanning frequency and credential analysis depth. The most practical self-protection measure for average users is to regularly check the default passwords and remote access settings on home devices.