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I'm not sure if you need to be online to generate these codes. On OS X, it's possible to go to System Preferences > iCloud > Account Details > Security > Get A

I'm not sure if you need to be online to generate these codes. On OS X, it's possible to go to System Preferences > iCloud > Account Details > Security > Get A Verification Code, which returns you a 6 digit verification code that looks like a TFA code.

stephenr 11y ago
You certainly don't - I just tested it with my phone in Airplane mode and it worked fine. Edit: to clarify, I originally tested it on my phone, but I've since tested on Mac and the result is the same. If you happen to have the iCloud "Account" screen open before losing all connectivity (i.e. it's open, then you turn off wifi/etc), the regular "Get Verification Code" button will work. In the more likely scenario that you just open up Settings/System Preferences > iCloud > Account, if you're offline it will tell you that you can't see your account details because you aren't online, but that you can generate a verification code while offline.
- kobayashi 11y ago
  Airplane mode on a Mac? As in, you turned off Wifi and Bluetooth (and obviously ensured that you didn't have a wired Internet connection)?
  - Tushon 11y ago
    > my phone in Airplane mode OP was referring to Google Auth working on phone regardless of current internet connection, the computer being disconnected in unrelated.
deleted 11y ago
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pilif 11y ago
Yepp. It works while offline. And it issues the same code on all devices for 30s. I would say it's using TOTP internally
drauh 11y ago
That does not seem to be available on Yosemite 10.10.5. But then again, I use a Hackintosh. However, TFA for Apple Accounts have been available for some time. I think I turned mine on a few months ago.
rabboRubble 10y ago
Very helpful to know! I've always wondered why Apple didn't have a method of code delivery independent of SMS. Even Facebook's app has a code generator. Apparently I just didn't know that it did.

stephenr 11y ago

You certainly don't - I just tested it with my phone in Airplane mode and it worked fine. Edit: to clarify, I originally tested it on my phone, but I've since tested on Mac and the result is the same. If you happen to have the iCloud "Account" screen open before losing all connectivity (i.e. it's open, then you turn off wifi/etc), the regular "Get Verification Code" button will work. In the more likely scenario that you just open up Settings/System Preferences > iCloud > Account, if you're offline it will tell you that you can't see your account details because you aren't online, but that you can generate a verification code while offline.

kobayashi 11y ago
Airplane mode on a Mac? As in, you turned off Wifi and Bluetooth (and obviously ensured that you didn't have a wired Internet connection)?
- Tushon 11y ago
  > my phone in Airplane mode OP was referring to Google Auth working on phone regardless of current internet connection, the computer being disconnected in unrelated.

deleted 11y ago

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pilif 11y ago

Yepp. It works while offline. And it issues the same code on all devices for 30s. I would say it's using TOTP internally

drauh 11y ago

That does not seem to be available on Yosemite 10.10.5. But then again, I use a Hackintosh. However, TFA for Apple Accounts have been available for some time. I think I turned mine on a few months ago.

rabboRubble 10y ago

Very helpful to know! I've always wondered why Apple didn't have a method of code delivery independent of SMS. Even Facebook's app has a code generator. Apparently I just didn't know that it did.