"Every UUID V4," which lets you list and search all UUIDs, and the technical challenges it faced

Nolen Royalty built Every UUID V4, a web app for browsing and searching the entire UUIDv4 space.

To make the listing usable, the app uses virtual scroll state instead of normal browser rendering.

It assigns a stable random-like order with a Feistel-based reversible mapping, preserving a bijection over UUIDv4s.

The search feature uses compromise substring matching to handle a huge key space more practically.

The project highlights the limits of browser UI and data navigation at astronomical scale.