npub1hmyql7cs5h83s928hp9lez8np6y7upvtm6dtfcnqz52ts63xw2aqg0vj8k (npub1hmy…vj8k) all PDS servers are connected to a single Bluesky network/relay (the domain is bsky.network) and don't talk to each other.
"AT Protocol network" doesn't exist in the sense ActivityPub network exists. There could theoretically be multiple independent (although overlapping) networks, but right now there's only Bluesky because compute resources needed for running a relay are comparable for running a search engine.