We check this website, now diaplanlenfilt.260mb.net is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is diaplanlenfilt Down Right Now? - NO! diaplanlenfilt is up!
If you have problem with access to site diaplanlenfilt, and domain diaplanlenfilt.260mb.net is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).