IPv6 Subnet Calculator

Enter any IPv6 address and prefix. Get full expansion, network address, host range, address type, and visual group breakdown.

IPv6 Address / Prefix

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Network Address

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Total Addresses

Prefix Length

Address Type

128-bit group breakdown — ■ network ■ host ■ split boundary

// address analysis

Common IPv6 prefixes

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// ipv6 subnetting

IPv6 addresses are 128 bits, written as 8 groups of 4 hex digits. Leading zeros in each group can be omitted, and one run of all-zero groups can be replaced with ::.

Standard hierarchy: ISPs get /32. Enterprises get /48. Each site gets /48. Each LAN subnet is a /64 — the first 64 bits identify the network, the last 64 are the interface ID.

A /64 contains 2^64 ≈ 18.4 quintillion addresses. You will never run out.