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ESP32-C3 DNS ad blocker runs 500,000 domains without PSRAM

Original: Open-source ESP32-C3 DNS ad blocker supports up to over 500,000 domains without PSRAM

An open-source DNS ad blocker project built on the low-cost ESP32-C3 microcontroller can filter requests for more than 500,000 domains without needing PSRAM. The project shows that cheap single-core RISC-V hardware can handle network-wide ad blocking at home, an area usually dominated by Raspberry Pi setups like Pi-hole. Hobbyists are discussing its memory efficiency and practicality as a minimalist alternative.

Why now: Makers are interested in running network-wide ad blocking on very cheap microcontroller hardware instead of a single-board computer.

ESP32-C3EspressifPi-hole

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Evidence

• Open-source ESP32-C3 DNS ad blocker supports up to over 500,000 domains without PSRAM · CNX Software
• Open-source ESP32-C3 DNS ad blocker supports up to over 500,000 domains without PSRAM · CNX Software

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