We check this website, now planespotters.net is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is planespotters Down Right Now? - NO! planespotters is up!
If you have problem with access to site planespotters, and domain planespotters.net is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).