Random Number Generator

This free random number generator allows you to generate a specified number of random integers within a minimum and maximum range of your choosing. You can also set the prefix and postfix and remove the duplicate numbers. The results can be copied as a list or as an array.

How many numbers:

Minimum value:

Maximum value:

Add prefix to each number:

Add postfix to each number:

No duplicate numbers

Generate

How it works:

This tool generates random numbers using the PHP function random_int, which is a cryptographically secure pseudo-random number generator (CSPRNG). This means the numbers aren't just random; they're unpredictable and safe for security-related tasks like creating session IDs and encryption keys. On a Linux-based server, random_int gets its randomness from the operating system's /dev/urandom pseudo-device. This is a special file that collects "entropy," or randomness, from various unpredictable system events.

Think of /dev/urandom as a constantly replenished "pool" of randomness. It's filled with data from events like mouse movements, keyboard input, disk activity, network traffic, the random_int function taps into this pool to generate highly secure random numbers.