Bluehost notified me that
Your servers’ IP address has changed from:
Since I host DNS and website on different provider, I have to change it manually, and they may not sync with each other perfectly. So you may expect short pause (from several hours to 24 hours). If you cannot access this blog in the next 48 hours, don’t worry. It will be back shortly after network IP address change and my DNS change both take effect.
Thank you for your patience.
Update May 18, 2007
The change has been completed, and there was no report of inaccessibility.