No longer able to access websites hosted by secure288.inmotionhosting

It has worked for years, but as of this morning I am unable to access any websites, including my email, that uses secure288.inmotionhosting. How do I get back my ability to see my company's website using my wifi network?  I can access the website on my phone if I turn off my wifi and use the cellular network.  However, I lose a lot of functionality using my phone.