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IPv6 CIDR 速查表IPv6 CIDR reference

完整 /0–/128 前缀，显示精确十进制地址总数和完整 /64 子网数，不使用浮点截断。Every prefix /0–/128 with exact decimal address counts and complete /64 subnet counts. No floating-point truncation.

配置Configuration

如何理解结果Understand the result

本地精确计算；结果明确标注主机位规范化及 /31、/32、/127、/128 的约定。Exact local arithmetic; host-bit normalization and /31, /32, /127, /128 conventions are shown with results.

原理、限制与隐私说明How it works, limitations & privacy

  • 所有计算使用精确 BigInt。IPv4 可用数按惯例扣除网络 / 广播地址，但 /31 点到点链路（RFC 3021）和 /32 主机路由除外；不保证每个地址均可实际分配。All arithmetic uses exact BigInt values. IPv4 usable counts use the conventional network/broadcast subtraction except /31 point-to-point (RFC 3021) and /32 host routes. They are not a guarantee that every address is assignable.

  • IPv6 无广播地址，也没有通用的“总数减二”主机规则。/64 常用于 SLAAC；更长前缀也有合法用途，包括 /127 点到点（RFC 6164）与 /128 主机路由。长于 /64 的前缀不含完整 /64 块，速查表以“—”显示。IPv6 has no broadcast address and no universal “total minus two” host rule. /64 is common for SLAAC; longer prefixes have valid uses including /127 point-to-point (RFC 6164) and /128 host routes. A prefix longer than /64 contains zero complete /64 blocks, shown as “—” in the reference.

  • 地址中的 /前缀 优先于独立掩码输入；含主机位时会规范化并明确标注。拒绝 zone ID、方括号、非连续掩码、带前导零的 IPv4 段和混合地址族范围；子网拆分最多展示 8 个示例。An inline /prefix takes precedence over the separate netmask field. Host-bit inputs are normalized and explicitly flagged. Zone IDs, brackets, non-contiguous masks, leading-zero IPv4 octets and mixed-family ranges are rejected. Subdivision shows at most eight examples.