I'd like to whitelist all subdomains of a particular domain.

For example Amazon has subdomains like these:

v-eu-preprod.amazon-adsystem.com
vaes-preprod.dub.amazon-adsystem.com
da-v-eu.amazon-adsystem.com
assoc-msdk-metrics-us.amazon-adsystem.com
vaes.iad.amazon-adsystem.com
aax-us-east-rtb-adx.amazon-adsystem.com

I want to whitelist all of them with *.amazon-adsystem.com

If I want to whitelist amazon-adsystem.com (not subdomain), I can use: amazon-adsystem.com (no wildcard)