Apple shares were up 2.6 percent at $546.06 in premarket trading. The stock closed at $532.17 on the Nasdaq on Monday.
Developer logs show that the app requests originate from an internet address on Apple's Cupertino campus, suggesting that Apple engineers are testing compatibility for some of the popular apps, the website said.
"Although OS and device data can be faked, the unique IP footprint leading back to Apple's Cupertino campus leads us to believe this is not one of those attempts," the website said.
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