Clever hacker fits 537,000 domains in a tiny $5 ESP32 ad-blocking dongle — firmware uses only around 50KB of RAM and can answer blocked lookups in 10 milliseconds

Global Tech Tue, 21 Jul 2026 10:00:02 GMT Moderate confidence — 64/100

(Image credit: ZedAxis/YouTube) How cheap can you build a hardware-based ad-blocking DNS filter?
"Free," if you're willing to salvage some used hardware that's being thrown away.

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(Image credit: ZedAxis/YouTube) How cheap can you build a hardware-based ad-blocking DNS filter?
"Free," if you're willing to salvage some used hardware that's being thrown away.

Sources: Tomshardware