How does the ESP32-S3 block ads?

The ESP32-S3 functions as a DNS server, filtering requests to ad domains. When an ad attempts to load, the device redirects the request to a non-existent address (0.0.0.0), preventing the ad from displaying.

What are the limitations of this method?

This method does not block YouTube ads, as they are served from the same servers as video content. It also does not support IPv6 addresses. For long-term use, a Raspberry Pi with PiHole may be a more robust solution.

What do I need to set up the ESP32-S3?

You’ll need an ESP32-S3 board with 8MB PSRAM, a USB-C cable, Arduino IDE, and the ESP32_AdBlocker software. Setup involves uploading the code, connecting to Wi-Fi, and configuring your network’s DNS settings to use the device.

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Hardware

ESP32-S3 for $7: How to Turn the Board into an Ad Blocker in Minutes

June 18, 2026

Photo: ZDNet

Quick answer

For just $7, the ESP32-S3 can be converted into a DNS ad blocker using the ESP32_AdBlocker software. The device acts as a sinkhole, redirecting ad domain requests to a non-existent address, saving bandwidth and…

Rising Raspberry Pi prices have led many to seek more affordable alternatives for small projects. One such solution is the ESP32-S3 board, which costs under $10 and can function as an ad blocker for home networks. Unlike the Raspberry Pi, the ESP32-S3 consumes minimal power and requires no additional components like a microSD card.

Setting up the ESP32-S3 is simple: just upload the pre-built ESP32_AdBlocker code via Arduino IDE. Once connected to a computer, the board becomes a Wi-Fi access point. Users can then connect to it, configure their home network settings, and select a list of domains to block. The device operates as a DNS sinkhole, redirecting ad content requests to a non-existent address, effectively preventing ads from loading.

This solution is ideal for temporary use, such as when internet bandwidth is limited. However, it has limitations: it does not block YouTube ads or support IPv6. For long-term use, experts recommend a Raspberry Pi Zero 2 W with PiHole, though this option is more expensive—starting at $15 for the board plus a microSD card.

The ESP32-S3 demonstrates how inexpensive microcontrollers can tackle practical tasks without complex configurations. This project is particularly relevant for enthusiasts looking to optimize their network performance without significant investment.

Common questions

How does the ESP32-S3 block ads?: The ESP32-S3 functions as a DNS server, filtering requests to ad domains. When an ad attempts to load, the device redirects the request to a non-existent address (0.0.0.0), preventing the ad from displaying.
What are the limitations of this method?: This method does not block YouTube ads, as they are served from the same servers as video content. It also does not support IPv6 addresses. For long-term use, a Raspberry Pi with PiHole may be a more robust solution.
What do I need to set up the ESP32-S3?: You’ll need an ESP32-S3 board with 8MB PSRAM, a USB-C cable, Arduino IDE, and the ESP32_AdBlocker software. Setup involves uploading the code, connecting to Wi-Fi, and configuring your network’s DNS settings to use the device.

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