ESTA - How to know/check if still valid?
 

I am travelling to US twice in December - I registered on ESTA either late last year or early this year (can't remember)... is there a way I can check if my ESTA registration remains valid without having to re-register and pay fee?

I am of nationality that is part of visa waiver programme.

You can check on the ESTA website here. Even if you don't have your application number, you can retrieve it from the same page.

The ESTA is valid for two years from the date of it's approval unless your passport expires sooner, where it thus expires on the same date as your passport.