This document describes how to check IPv6 support on your device IOS.
Go to Cisco Feature Navigator to verify if IPv6 is supported on your Hardware or Software. Please select the correct IOS feature set like IP Plus, Enterprise Plus, Advanced IP Services, etc for IPv6 functionality.
From the Feature Navigator, select Search by Feature and use "IPv6 (Internet Protocol Version 6)" as the feature. Select "IPv6 (Internet Protocol Version 6)" from the Available Features list, select Add and then Continue.