Heya Alnarra,
We’ve been tracking what’s probably the same issue, over at Moon Guard disconnection issues compendium - could I ask you to run the test in post #24 and let us know your findings?
Also, to explain what you’re seeing in ARIN - 24.105.0.0/18 means “every IP address in range 24.105.0.1 - 24.105.63.254”, and 137.221.96.0/19 is “every IP address in range 137.221.96.1 - 137.221.127.254”. 137.221.105.2 is the address, probably a router, in their West Coast datacenter that’s allowing ICMP packets and is therefore usable for WinMTR tests. All others (including 137.221.97.120 and 137.221.96.152) are denying ICMP. But, since all of those addresses are located in the same datacenter, an routing issue occurring to 137.221.105.2 would also occur to 137.221.97.120 or 137.221.96.152.
And, for the final part of the puzzle that threw me off originally - Moon Guard is a CST timezone server hosted in the US West datacenter.