writes "DynDNS is currently experiencing a DDoS attack. According to their website: "Beginning at 1520 UTC, we are experiencing a DDoS against the Standard DNS nameservers. Customers may be seeing overall decreased performance during this time.
During this time, zones who update via DNS transfers (AXFR) will not be up to date.
As of 1700 UTC, some Dyn Standard DNS nameservers are back online. Dyn Operations staff continue to work to restore full connectivity to all Dyn Standard DNS nameservers.""Link to Original Source