hello - I'm hoping someone can help me out with some ideas.

About 90 minutes ago I noticed websites not being available on my dedicated server.

I'm using whm.
Logged in - everything looks normal.
Until I look at my nameservers.

I have 4 different nameservers (for legacy reasons): 2 different sets on 2 TLDs amd I'm running about 50 sites on the box - all using one set or the other.

Somehow the namserver IP addresses for all 4 nameservers have been chnaged to a different single IP address somewhere in the States.

I'm at a loss as to how this has happened and also how to fix it. I've logged a call with the datacentre but it's evneing here and I guess they'll take at least 4 hours to respond.

I have not had this occur before. How have the nameserver IP addresses changed? Also, how can I change them back.

Has this been done via the DNS system external to my server or has it been hacked?

Any help would be very gratefully received - I will soon have customers shouting at me.