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by RobinUS2 2900 days ago
generally lookup the IPs (dig <hostname>) and then attempt a host/whois on that IP. For PushBullet it's hidden by CloudFlare so hard to see easily, you should try and find an exposed endpoint (which they haven't if they've done well).
1 comments

My Chrome extension (IPvFoo) displays all the subresource IP addresses in a table:

https://chrome.google.com/webstore/detail/ipvfoo/ecanpcehffn...

(There's a right-click option to look up each address on bgp.he.net, but that doesn't happen automatically, for privacy.)