Please find below the answer:
you can use:
https://www.site24x7.com/tools/ipv6-subnetcalculator.html
 
Subnet 1: 2401:4900:2180:: 2401:4900:2180:: - 2401:4900:2180:0000:ffff:ffff:ffff:ffff 2401:4900:2180::/64
Subnet 2: 2401:4900:2180:0001:: 2401:4900:2180:1:: - 2401:4900:2180:1:ffff:ffff:ffff:ffff 2401:4900:2180:1::/64

one before last: 8388607:  2401:4900:21ff:fffe:: 2401:4900:21ff:fffe:: - 2401:4900:21ff:fffe:ffff:ffff:ffff:ffff 2401:4900:21ff:fffe::/64

Last: 8388608: 2401:4900:21ff:ffff:: 2401:4900:21ff:ffff:: - 2401:4900:21ff:ffff:ffff:ffff:ffff:ffff 2401:4900:21ff:ffff::/64
 
Regards
 
 
On 18/11/16 21:38, srinivas b <bsvasu@gmail.com> wrote:
SP GIVEN IPV6 BLOCK 2401:4900:2180:0:0:0:0:0/41

need to make 4 /64 pools from above pool and can someone share the /64 IP pool with first and last IPs


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