Looks more like an avast update server address v6197912.iavs9x.u.avast.com provided by Akamai (Akamai: Cloud Delivery, Performance, and Security) a CND Content Delivery Network.
Though why or who it would be added to the HOSTS file, I don't know. There is nothing in my HOSTS file for my Win10 or winXP systems, I haven't checked my win7 system.