If you mean IP addresses, then, yes, they publish a .csv with the IP addresses [1]

It seems to update once a month [2]

[1] https://developer.apple.com/support/prepare-your-network-for...

[2] https://imgur.com/a/35HIV5M (only showing counts for IPv4, they have huge IPv6 blocks)

There are currently two subdomains associated with Private Relay. Apple's documentation implies that all connections are initiated through one or the other.

    mask.icloud.com
    mask-h2.icloud.com