Whitelisting Cloudflare IPs

Hello,
I found the Cloudflare IP ranges from the following URL: https://www.cloudflare.com/ips/
I am having a difficulty to understand what 103.21.244.0/22 means.
Is this all IP numbers starting with 103.21.244.0 , 103.21.244.1, 103.21.244.2, … until 22?

Because it is not /24 /16 format, Cloudflare itself doesn’t accept /22 when whitelisting IPs in firewall tools.

Thank you

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