IP subnet calculator

2a01:c910::-2a01:c918:7fff:ffff:ffff:ffff:ffff:ffff

2a01:c918::-2a01:c918:7fff:ffff:ffff:ffff:ffff:ffff
2a01:c918::/33

2a01:c910::-2a01:c917:ffff:ffff:ffff:ffff:ffff:ffff
2a01:c910::/29