IPv6 subnet calculator.

Our free IPv6 subnet calculator splits an IPv6 prefix into equal subnets and lists the network address and address range of each one.

IPv6 Subnet calculator.

IPv4IPv6

Add the prefix after a slash; without one, /64 is used.

The 16 resulting /52 subnets of 2001:db8::/48, each with 75,557,863,725,914,323,419,136 IPs, are:

Subnet AddressAddress Range
2001:db8::/522001:db8:: - 2001:db8:0:fff:ffff:ffff:ffff:ffff
2001:db8:0:1000::/522001:db8:0:1000:: - 2001:db8:0:1fff:ffff:ffff:ffff:ffff
2001:db8:0:2000::/522001:db8:0:2000:: - 2001:db8:0:2fff:ffff:ffff:ffff:ffff
2001:db8:0:3000::/522001:db8:0:3000:: - 2001:db8:0:3fff:ffff:ffff:ffff:ffff
2001:db8:0:4000::/522001:db8:0:4000:: - 2001:db8:0:4fff:ffff:ffff:ffff:ffff
2001:db8:0:5000::/522001:db8:0:5000:: - 2001:db8:0:5fff:ffff:ffff:ffff:ffff
2001:db8:0:6000::/522001:db8:0:6000:: - 2001:db8:0:6fff:ffff:ffff:ffff:ffff
2001:db8:0:7000::/522001:db8:0:7000:: - 2001:db8:0:7fff:ffff:ffff:ffff:ffff
2001:db8:0:8000::/522001:db8:0:8000:: - 2001:db8:0:8fff:ffff:ffff:ffff:ffff
2001:db8:0:9000::/522001:db8:0:9000:: - 2001:db8:0:9fff:ffff:ffff:ffff:ffff
2001:db8:0:a000::/522001:db8:0:a000:: - 2001:db8:0:afff:ffff:ffff:ffff:ffff
2001:db8:0:b000::/522001:db8:0:b000:: - 2001:db8:0:bfff:ffff:ffff:ffff:ffff
2001:db8:0:c000::/522001:db8:0:c000:: - 2001:db8:0:cfff:ffff:ffff:ffff:ffff
2001:db8:0:d000::/522001:db8:0:d000:: - 2001:db8:0:dfff:ffff:ffff:ffff:ffff
2001:db8:0:e000::/522001:db8:0:e000:: - 2001:db8:0:efff:ffff:ffff:ffff:ffff
2001:db8:0:f000::/522001:db8:0:f000:: - 2001:db8:0:ffff:ffff:ffff:ffff:ffff

How to use the IPv6 subnet calculator?

Enter an IPv6 network with its prefix, such as 2001:db8::/48, and choose how many subnets you need. The calculator shows the new prefix length, how many addresses each subnet holds, and the network address and address range of every subnet. You can export the list as a CSV file.

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Frequently asked questions.

  • It splits an IPv6 prefix - for example the /48 your provider assigns - into smaller subnets and shows the network address and address range of each one. That makes planning VLANs, data-center segments or cloud networks quicker and avoids overlapping ranges.

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