I just went there and it’s working fine.
I suspect that the DNS server on your service provider’s system is in need of a reboot. That is usually what happens nowadays. Gone are the days of redundant DNS server backbones. In the early days of the Net, most service providers contracted with three or more DNS services but nowadays nearly every system we’ve seen is down to one provider. When they experience problems, there is no secondary support system.
I’d call your service provider and ask them to reboot their DNS server.
Ron Lindeboom