Just a few minutes ago someone reached this website searching for “http_user_agent sidekick” - though there wasn’t an answer to that question on the site google referred him to. Well anyway, the answer is simple: The Danger Sidekick/Hiptop uses a user-agent of “Mozilla/5.0 (Danger hiptop 2.0; U; AvantGo 3.2)” and request are from the network 216.220.208.0/20 (216.220.208.0 to 216.220.223.255).