IP subnet calculator

2a01:4f9:1a:b529::-2a01:4f9:1a:b529:ffff:ffff:ffff:ffff

2a01:4f9:1a:b529::-2a01:4f9:1a:b529:ffff:ffff:ffff:ffff
2a01:4f9:1a:b529::/64