I checked my router IP today and was pleasantly surprised that it has change to 118.x.x.x as show below and was surprised to see that the Speed on Demand page actually loaded!
So I can confirm that router IPs of 118.x.x.x can access the login page and I presume can use the service as well. Will try test this out in the coming days
PS. The images have been manipulated to hide my exact IP address but this is no Aprils fools prank =)