There's no relationship between HSRP and EIGRP.
The routers will be using the real IP addresses on the interfaces when establishing EIGRP neighborship.
The actual routes annonced thru' EIGRP are derived from the real IP adresses of the interfaces.
The virtual addresses that HSRP presents to the users are on the same subnet as the real IP addresses of the router interfaces. You cannot derive subnet information from the HSRP addresses, since there's no subnet mask attached, but that's available from the real IP addresses.
