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Dev tools · October 13, 2020

Low-Level Academy, an explorable systems programming course

Introduction to UDP: sockets, frames, and data encoding. We build a Rust client for a simple name server that converts domain names into IP addresses.

Low-Level Academy, an explorable systems programming course launched on October 13, 2020 with 419 votes, #28 of 4,018 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 6 years on.

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In plain words

Low-Level Academy is an interactive systems programming course designed to teach users how computer systems work at a fundamental level. It offers explorable lessons covering topics like assembly language, memory management, and hardware interaction. The course is structured to allow learners to experiment with code directly within the educational material. It serves students and professionals interested in understanding systems programming concepts without relying on traditional textbooks or lectures.

written from the facts on this page · September 2026

From the sources

When you opened this page in your web browser, your computer exchanged data with quite a few servers on the internet, almost unnoticeably to you. In this lesson, we’ll build a network client application, which does something similar to your browser in this situation. It all starts with an address : you want to send a message to your friend Alice, but your computer needs to know where these messages should be sent for the message to be delivered to the right computer—just like you need to provide a recipient address when you send an email. We are used to one kind of address system: domain names , like lowlvl.org or duckduckgo.com . However, these addresses are intended to be used by human…from lowlvl.org

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