How postman mock server url is being resolved

When creating mock server the url generated looks like a dynamically generated UUID . So was wondering if its something created dynamically how is DNS server able to resolve this DNS name how is the url registered in DNS.

Just curious to know

What is a Wildcard DNS record?

A wildcard DNS record is a record that answers DNS requests for any subdomain you haven’t already defined. You can create wildcard A records and CNAME records by entering an asterisk (*) in the host field when creating a DNS record.

For example, if you create the wildcard A record *.goosehollow.design and someone visits https://abcdef.goosehollow.design , their request will resolve to the IP address you specified as the answer.