Subnet Calc

该 Skill 通过本地 Python 脚本计算 IPv4/IPv6 的 CIDR 子网信息，输出网络地址、广播地址、主机范围、子网掩码与通配符掩码，并支持包含性检查、子网拆分及 plain/JSON 输出。仅依赖 Python 3 标准库，不访问网络。

johnnywang2001

热度 79.59

最近更新 2026-05-11 17:34:24

分类：效率依赖：代码执行应用场景：数据处理 / 自动化脚本

安装技能

复制下面的话术发给你的 Agent，它会通过 secure-skills 检索并安装该技能。

执行命令安装此 skill： npx secure-skills-cli add subnet-calc

Metadata

name: subnet-calc
description: CIDR and subnet calculator for network engineers. Calculate network address, broadcast, host range, subnet mask, wildcard mask, and more from CIDR notation. Supports IPv4 and IPv6, containment checks, and subnet splitting. Use when working with IP addresses, subnets, network planning, CIDR calculations, or checking if an IP is within a range.

Subnet Calc

CIDR/subnet calculator CLI. IPv4 and IPv6 support with no external dependencies.

Quick Start

# Basic subnet calculation
python3 scripts/subnet_calc.py 192.168.1.0/24

# JSON output
python3 scripts/subnet_calc.py 10.0.0.0/8 -f json

# Check if IP is in a network
python3 scripts/subnet_calc.py 172.16.0.0/16 --contains 172.16.5.10

# Split into smaller subnets
python3 scripts/subnet_calc.py 192.168.0.0/22 --split 24

# IPv6
python3 scripts/subnet_calc.py 2001:db8::/32

Output Fields (IPv4)

CIDR — Normalized CIDR notation
Network/Broadcast Address — First and last address in the range
Subnet Mask / Wildcard Mask — Standard and inverted masks
Total Addresses / Usable Hosts — Address count minus network and broadcast
First/Last Host — Usable host range
Binary representations — Network and mask in binary
Flags — Private, loopback, multicast, link-local detection

Options

Flag	Description
`-f, --format`	`plain` or `json` output
`--contains IP`	Check if IP is within the network
`--split PREFIX`	Split into subnets with given prefix (IPv4)

Notes

Python 3 stdlib only (uses ipaddress module)
Handles /31 (RFC 3021 point-to-point) and /32 correctly
Input is normalized with strict=False (host bits are masked)