We host our site through superb.net which in turn uses the hopone.net network. At around midnight PDT we started noting unreachability of our site. Some users were able to get in while others failed. Connecting to the superb control panel revealed the following:

When Affecting What The Details
12m ago Core1 at DCA2. The maintenance window has been extended until 5am due to the unexpected problem with network connectivity.
55m ago Shared/Dedicated DCA2 data center clients: We are currently experiencing a network issue related to the scheduled upgrade of our core routers and line cards causing connectivity issues to many of our shared web-platforms and dedicated server clients. This issue is currently of the highest priority and our engineers are diligently working to resolve it as soon as possible.