Missing relay in topology.json

The local addresses cannot be in DNS conf, they are not meant to be used on the Internet, so in your example there is only one IP address for each domain name, hence a valency of 1… If you have any doubt about another domain name, e.g. relays-new.cardano-mainnet.iohk.io, then you could check its IP address(es) with

$ dig relays-new.cardano-mainnet.iohk.io +short
204.236.187.238
18.159.63.239
54.255.126.22
3.128.167.127
18.133.102.151
18.158.196.38
3.126.150.220
13.57.118.58

As for the ports, they’re not related to IP layer but to TCP.

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