IP subnet calculator

2a01:4f9:c010:4000::-2a01:4f9:c012:ffff:ffff:ffff:ffff:ffff

2a01:4f9:c010:4000::-2a01:4f9:c010:7fff:ffff:ffff:ffff:ffff
2a01:4f9:c010:4000::/50

2a01:4f9:c010:8000::-2a01:4f9:c010:ffff:ffff:ffff:ffff:ffff
2a01:4f9:c010:8000::/49

2a01:4f9:c011::-2a01:4f9:c011:ffff:ffff:ffff:ffff:ffff
2a01:4f9:c011::/48

2a01:4f9:c012::-2a01:4f9:c012:ffff:ffff:ffff:ffff:ffff
2a01:4f9:c012::/48