Hi there!

$ ping www.bluewin.ch
ping: cannot resolve www.bluewin.ch: Unknown host

The authoritative nameserver do not answer:

adnso1.bluewin.ch [195.186.196.180]
adnso2.bluewin.ch [195.186.196.190]
adnsz1.bluewin.ch [195.186.145.180]
adnsz2.bluewin.ch [195.186.145.190]

Matthias