DNS

IPv4 & IPv6 calculator.

Split, merge or subtract networks, or convert an address range to CIDRs.

Up to 256 subnets per page. All 64 results of a 64-subnet split appear together.

One IP family per calculation · no network requests

2800:8c00::/22 → /22

1 CIDRs

81,129,638,414,606,681,695,789,005,144,064 addresses per subnet81,129,638,414,606,681,695,789,005,144,064 addresses totalNetmask ffff:fc00::

Showing 1–1 of 1. Ranges include every address.

#Subnet / WHOISFirst addressLast addressAddresses
12800:8c00::/222800:8c00::2800:8fff:ffff:ffff:ffff:ffff:ffff:ffff81,129,638,414,606,681,695,789,005,144,064
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Large splits are paged without generating the full address space. Counts are exact for IPv6. Merge and exclusion inputs accept up to 1,024 blocks and produce at most 8,192 CIDRs. Downloads and copy buttons use the displayed page.