I've used https://dnmin.com https://dnmin.com for about 6 years now. It's a free service I found on lowendtalk.com You can paste in a list of your domains and

I've used https://dnmin.com https://dnmin.com for about 6 years now. It's a free service I found on lowendtalk.com You can paste in a list of your domains and it'll help you organize them and send you email notifications when they're close to expiring.