IP subnet calculator

2a01:4f8:10a:d60::-2a01:4f8:10a:d60:ffff:ffff:ffff:ffff

2a01:4f8:10a:d60::-2a01:4f8:10a:d60:ffff:ffff:ffff:ffff
2a01:4f8:10a:d60::/64