IP subnet calculator

2a03:6f00:1::-2a03:6f00:4:ffff:ffff:ffff:ffff:ffff

2a03:6f00:1::-2a03:6f00:1:ffff:ffff:ffff:ffff:ffff
2a03:6f00:1::/48

2a03:6f00:2::-2a03:6f00:3:ffff:ffff:ffff:ffff:ffff
2a03:6f00:2::/47

2a03:6f00:4::-2a03:6f00:4:ffff:ffff:ffff:ffff:ffff
2a03:6f00:4::/48