Blokada

Blokada is an open-source DNS-based ad and tracker blocking application for mobile devices that filters network traffic at the DNS level to block advertising domains, tracking scripts, and malicious domains before they can reach the device. It is available for Android and iOS.

For OSINT investigators, Blokada's relevance is primarily operational security and research environment hygiene rather than direct investigation capability. When conducting mobile-based OSINT research or operating investigation workflows from a mobile device, Blokada reduces the tracking footprint generated by background app activity and embedded tracking pixels in web content.

DNS-based blocking prevents requests to known advertising and tracking domains from ever leaving the device — reducing the intelligence available to ad networks and trackers about what sites an investigator is visiting during research. This is relevant when conducting investigation from a mobile device where ad network data could theoretically be associated with investigation activity.

For investigations involving mobile device security assessments, understanding Blokada's blocking capabilities informs analysis of what data is generated by mobile applications when ad/tracker blocking is and is not active.

The application also provides security by blocking connections to known malicious domains at the DNS level — reducing risk when clicking unfamiliar links during investigation, as malicious domains will be blocked before the browser can connect.

For investigators configuring secure mobile research environments, Blokada is a component of mobile operational security alongside a VPN, privacy-respecting browser, and appropriate app permissions management.

Note the version of Blokada used, filter lists enabled, and any custom blocking rules configured when documenting investigation environment setup.