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