IPv6 Subnet Calculator

Expand, compress, and analyze IPv6 addresses with CIDR prefix — fully client-side.

100% In-Browser & Private — your data never leaves this device
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How to use the IPv6 Subnet Calculator

  1. Enter an IPv6 address with prefix (e.g. 2001:db8::1/64).
  2. View expanded and compressed forms and address space info.

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