I never use iMessage. I never use iCloud. And yet I happened to check my Mac's current network connections and I found this:
IMRemoteURLConn 33557 me 7u IPv4 ... 0t0 TCP 192.168.1.198:57996-> 18.104.22.168:http (ESTABLISHED)
Note that 22.214.171.124 is a Charter ISP address, not Apple's.
Notice that it is trying to contact it on port 80 (HTTP).
So I try this:
$ wget 126.96.36.199 --2019-02-07 22:05:25-- http://188.8.131.52/ Connecting to 184.108.40.206:80... connected. HTTP request sent, awaiting response... 400 Bad Request 2019-02-07 22:05:25 ERROR 400: Bad Request.
Why would a random Charter IP address have a web server running? In fact, you can try any IP in that subnet and each one has a web server running.
Note that we are Charter customers but our IP is different, it's 104.172.x.x.
In Terminal I used "sudo log show | less" and searched for 107.14.47 ... It turns out this is init-p01st.push.apple.com. So Apple has put a push server in Charter's range... in theory.
Pinging it shows akamai.net however, not Charter, so this still looks fishy.