Auth0 IP Firewall Allow List

The IPs that are listed as outbound here, is there a DNS name that’s safe to use to reference them as a group? Auth0 IP Addresses for Allow Lists

A reverse DNS lookup yields as the DNS for those US IPs, is that an equivalent firewall entry to listing all the IPs? Currently working with a client who requires a DNS entry instead of a list of static IPs.

Thank you for taking time to read, appreciate any advice!