Just a note: Bitnodes shows the number reachable nodes on their main page, which means those that allow incoming connections. They have a page for
all the nodes (outgoing and incoming).
So, back to your topic. Due to decentralization, it's possible for few nodes to not be crawled by bitnodes, but can you point out which one allows incoming connections and isn't shown there?
Additionally, some peers have the addrlocal field set to 127.0.0.1, while most have my IP address. Any reason why?
The
addrlocal should be a local IP, according to
bitcoindeveloper, so it's reasonable to be 127.0.0.1. This is yours locally, and same is to everybody else.