It does not appear that the dynadot nameservers are responding, nor is the ip lookup tool working (it can't contact the root servers). What is going on?
Our name servers are responding, but we had some issues making domain updates to them within the last day. So it would have appeared that the name servers weren't responding for any domains that were set to use them within the last day. That problem has been resolved and all domain updates have been applied. We apologize for any inconvenience this may have caused.
And our IP Lookup tool isn't working at the moment. It's a minor problem. There is no real connection problem with the root servers.