Request HotBits (Secure Server)

Generate random bytes (maximum 2048).





password(s) of

API key:   ?
(No API key required)  ?


This page requests HotBits using the HTTPS protocol to encrypt the request for HotBits and the random data returned to you. This reduces the risk of your request being diverted to another site (because the request is encrypted with Fourmilab's certificate), and/or the random data being intercepted on its way to you.

As of the end of 2022, the HotBits Radioactive Random Number Generator service has been retired. Please see the “HotBits Radioactive Generator Retired” page for additional information. You can request random data from the secondary on-chip random source using your API key with “R” as the first character instead of “H”.

HotBits Main Page

How HotBits Works

HotBits Hardware Description

Statistical Tests of HotBits Data

by John Walker