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Free Online IPv6 Subnet Calculator

Calculate IPv6 network and last address from a validated address and prefix using exact BigInt arithmetic. Output is uncompressed hexadecimal.

Your input stays on this device. Processing is bounded; regex runs in a worker with a two-second timeout.

Result



How to use IPv6 Subnet Calculator
Calculate IPv6 network and last address from a validated address and prefix using exact BigInt arithmetic. Output is uncompressed hexadecimal.
  1. Set Text.
  2. Run the tool, review the result and its stated limitations, then copy or download if needed.
Example & practical use
Calculate IPv6 network and last address from a validated address and prefix using exact BigInt arithmetic. Output is uncompressed hexadecimal. The example below demonstrates Text.
Example input:
{
  "text": "2001:db8::1/64"
}
Expected result (relevant fields):
{
  "network": "2001:db8:0:0:0:0:0:0",
  "last": "2001:db8:0:0:ffff:ffff:ffff:ffff",
  "addresses": "18446744073709551616"
}
Features & result limitations
Calculate IPv6 network and last address from a validated address and prefix using exact BigInt arithmetic. Output is uncompressed hexadecimal.
Frequently asked questions
What inputs does IPv6 Subnet Calculator accept?
Text
How should I interpret the IPv6 Subnet Calculator result?
Calculate IPv6 network and last address from a validated address and prefix using exact BigInt arithmetic. Output is uncompressed hexadecimal.
Where does IPv6 Subnet Calculator process my data?
Inputs are processed locally in your browser. Submitted text is not sent to external services. A successful-run event increments an aggregate tool counter without your input.