The main domain ( diep.io ) is often the first blocked. Try these official or semi-official mirrors:

Instead of firing bullets, these tanks control AI-driven drones. The is widely considered one of the most powerful tanks in the game due to its high burst damage and defensive capabilities. The Flank Guard Branch

open for project work. Many developers host unblocked versions of Diep.io on these pages. VPNs and Extensions

However, the hunt for unblocked games comes with risks. The ecosystem of "unblocked" sites is a digital minefield.