Any node in the TON network has its own ADNL address. It's like IP addresses on the Internet; they are public keys for the network to utilize. It's more like personal information.

You can read more here:

https://ton.org/docs/learn/networking/adnl#:~:text=An%20ADNL%20Address%20is%20essentially,intended%20for%20the%20recipient%20address