Clever hacker fits 537,000 domains in a $5 ESP32 ad-blocking dongle

An embedded systems developer has created an ad-blocking dongle using a five-dollar ESP32 microcontroller, Hacker News reports. The device stores five hundred thirty-seven thousand blocked domains using just fifty kilobytes of RAM and answers DNS lookups in ten milliseconds, showing that network-level ad blocking can be implemented on remarkably low-cost hardware.

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