Does the MacBook Air power extension cord work with 230v?

Hello,

I understand that the MagSafe power adapter supplied with the MacBook Air is compatible with an overseas input of up to 230v, as printed on the adapter itself. However, the extension cord supplied with the laptop states 125v. Furthermore, even the small plug connected at the end of the adapter states an input of 125v. Does this mean that the plug and the extension cord are incompatible overseas at 230v, but the adapter is? Then, how must I connect a MacBook Air to a 230v outlet? I do have an outlet converter that does not transform voltage. Thank you for your support.

(The adapter states it is compatible with 100v-240v, however, the circled plug is only compatible with 125v.)

Mukund