Subnetic快速离线子网计算器
关于
Subnetic 是一款为网络工程师、系统管理员和学生打造的快速、注重隐私的子网计算器。
输入任意 IPv4 地址或 CIDR，即可立即获得网络地址、广播地址、子网掩码、通配符掩码、可用主机范围、主机数量、地址类别与作用域——还有实时二进制分解，清晰标出网络位与主机位。结果随输入实时更新，前缀滑块让你轻点即可在 /0 到 /32 之间切换。
Subnetic 的独特之处
- 输入 IPv4 地址或 CIDR 即可实时计算，并提供网络位与主机位的实时二进制分解。
- 支持点分掩码与前缀输入，兼容 RFC 3021（/31）与 /32——点按任意数值即可复制。
- 子网分割器——将网段等分，或按主机需求用 VLSM 进行划分（专业版）。
- 完整的 IPv6 计算器——前缀、范围、展开/压缩、地址数量（专业版）。
- 导出与一键复制——一次性复制所有字段，或以文本形式分享结果（专业版）。
- 100% 离线——无需账号，不联网，不追踪。
定价
Subnetic 免费使用，包含完整的 IPv4/CIDR 计算器、实时二进制分解与一键复制。Subnetic 专业版为一次性购买——不是订阅——加入子网分割器、完整 IPv6 计算器，以及导出与一键复制全部字段。
反馈
由一个小型独立团队打造。如有反馈、错误报告或功能建议，欢迎发送邮件至 obeliskclubclub@gmail.com。
采用原生 Apple 框架打造，界面简洁、现代。
服务条款（EULA）：https://obelisk.club/subnetcalculator/terms
核心能力
输入 IPv4 地址或 CIDR 即可实时计算
网络位与主机位的实时二进制分解
子网分割器，支持等分与 VLSM 划分（Pro）
完整的 IPv6 计算器（Pro）
导出与一键复制（Pro）
100% 离线——无需账号，不追踪
常见问题
- How do I calculate a /26 subnet?
- A /26 uses 26 network bits, giving a subnet mask of 255.255.255.192 and 64 addresses per subnet — 62 of them usable for hosts after subtracting the network and broadcast addresses. In Subnetic you can type any address with /26 (or drag the prefix slider to 26) and instantly see the network, broadcast, mask, wildcard, and usable host range, along with a live binary view showing exactly which bits are network and which are host.
- What is CIDR notation and how does it relate to a subnet mask?
- CIDR notation writes an address followed by a slash and the number of network bits, like 192.168.1.0/24 — the /24 is shorthand for the mask 255.255.255.0. It replaced classful addressing so networks can be sized to fit rather than locked to Class A, B, or C boundaries. Subnetic accepts both prefix and dotted-mask input and converts between them as you type.
- Does a subnet calculator need an internet connection?
- No — subnetting is pure arithmetic on the address bits, so there is nothing to look up online. Subnetic runs 100% on-device with no accounts, no network calls, and no tracking, which also means it works in exactly the places network engineers tend to need it: data centers, labs, and sites where the network is down.
- Can Subnetic split a network into smaller subnets with VLSM?
- Yes. The Subnet Splitter in Subnetic Pro can divide a block into equal subnets or pack it by host requirement using VLSM, so each subnet gets just the space it needs. Pro is a one-time purchase, not a subscription, and also adds a full IPv6 calculator and export/copy-all.
- How many usable hosts are in a /31 or /32 network?
- A /32 is a single host address, and a /31 has only two addresses — under classic rules that left zero usable hosts, but RFC 3021 allows both addresses of a /31 to be used on point-to-point links. Subnetic is RFC 3021 and /32 aware, so it reports these edge cases correctly instead of showing a misleading zero.
界面展示
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