npub1yqwcsafkzl4fequd25qg6yvmyxusk8gmpe7hkpfcnzc34afx4npsfhwajx (npub1yqw…wajx)
8448 is the default port Matrix servers and clients would try to connect to if there is no .well-known data found on the domain.
You can host a federated server with just 443 open.