🌐 网络工具Network & Web
子网掩码计算器IPv4 Subnet Calculator (CIDR)
输入 IP/CIDR（如 192.168.1.10/24），计算网络地址、广播地址、子网掩码、可用主机范围和数量。Calculate network, broadcast, mask, wildcard and usable host range from IP/CIDR.
IPv6 地址展开/压缩IPv6 Expand & Compress
IPv6 地址完整展开与压缩（::），显示地址类型和反向解析 ip6.arpa。Expand or compress IPv6 addresses, show address type and ip6.arpa reverse name.
IP 地址进制转换IP Address Converter
IPv4 地址与十进制整数、十六进制、二进制、IPv4 映射 IPv6 互相转换。Convert IPv4 addresses to/from decimal integer, hex, binary and IPv4-mapped IPv6.
IP 范围转 CIDRIP Range to CIDR
把 IP 起止范围（如 10.0.0.0 - 10.0.3.255）转换为最少的 CIDR 网段列表。Convert IP ranges (start - end) into the minimal list of CIDR blocks.
User-Agent 解析User Agent Parser
解析浏览器 User-Agent 字符串：浏览器、版本、操作系统、设备类型和渲染引擎。默认显示你自己的 UA。Parse User-Agent strings into browser, version, OS, device type and engine (yours by default).
我的浏览器信息What's My Browser
查看你的浏览器、操作系统、屏幕分辨率、视口大小、像素比、语言、时区、CPU 核心等信息。See your browser, OS, screen resolution, viewport, pixel ratio, language, time zone, CPU cores and more.
MAC 地址格式转换MAC Address Formatter
把 MAC 地址转换为冒号、短横线、Cisco 点分、无分隔等格式，支持批量。Convert MAC addresses between colon, hyphen, Cisco dot and plain formats, in bulk.
Punycode 中文域名转换Punycode Converter (IDN)
中文/国际化域名（IDN）与 Punycode（xn--）编码互相转换，如 例子.中国 ↔ xn--fsqu00a.xn--fiqs8s。Convert internationalized domain names (IDN) to/from Punycode (xn--).
HTTP 请求头解析HTTP Header Parser
把原始 HTTP 请求/响应头文本解析为 JSON，识别请求行/状态行和 Cookie。Parse raw HTTP request/response headers into JSON, including the start line and cookies.
常用端口号大全Common Network Ports List
常见 TCP/UDP 端口号速查：22 SSH、80 HTTP、443 HTTPS、3306 MySQL、6379 Redis 等，可搜索。Searchable list of common TCP/UDP ports: 22 SSH, 80 HTTP, 443 HTTPS, 3306 MySQL, 6379 Redis…
邮箱地址格式验证Email Address Validator
批量检查邮箱地址格式是否有效，并提示常见错误（如 gmial.com 拼写）。Bulk-check email address syntax and flag common typos (e.g. gmial.com).
WiFi 二维码生成器WiFi QR Code Generator
输入 WiFi 名称和密码生成二维码，手机扫码即可连接，支持 WPA/WPA2/WPA3、WEP 和开放网络，可下载打印。Create a QR code that joins your WiFi network when scanned — WPA/WPA2/WPA3, WEP or open — download and print it.
下载时间计算器Download Time Calculator
根据文件大小和网速（Mbps、MB/s 等）计算下载或上传所需时间，可考虑网络开销。How long a download or upload takes for a given file size and connection speed (Mbps, MB/s…), with overhead.
公共 DNS 服务器大全Public DNS Servers
常用公共 DNS 服务器 IPv4/IPv6 地址大全：阿里、腾讯、114、百度、谷歌、Cloudflare、Quad9、OpenDNS 等，点击复制。A list of popular public DNS resolvers (Alibaba, Tencent, 114, Google, Cloudflare, Quad9, OpenDNS…) with IPv4/IPv6 addresses to copy.
HTTP 请求方法大全HTTP Request Methods
HTTP 请求方法（GET、POST、PUT、DELETE、PATCH、HEAD、OPTIONS…）含义、是否安全、是否幂等对照表。Reference of HTTP request methods (GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS…) with safe/idempotent flags.
HTTP 请求头/响应头大全HTTP Headers Reference
常见 HTTP 请求头与响应头字段说明大全：Content-Type、Authorization、Cache-Control、CORS、Cookie、Content-Security-Policy 等。Reference of common HTTP request and response header fields with explanations.
常用 User-Agent 大全Common User-Agent Strings
常见浏览器、手机、操作系统和爬虫的 User-Agent 字符串大全，点击即可复制，方便测试和调试。A list of common browser, mobile, OS and crawler User-Agent strings, click to copy.
世界各国区号与时差查询Country Calling Codes & Time Zones
世界各国国际电话区号（+XX）与相对 UTC 的标准时差对照表，可搜索。International dialing codes (+XX) and standard UTC offsets for countries worldwide, searchable.
网址桌面快捷方式生成Website Shortcut (.url) Generator
生成网址的 Windows 桌面快捷方式（.url 文件），下载后双击即可用默认浏览器打开指定网址。Generate a Windows desktop shortcut (.url file) for a URL; download and double-click to open it in the default browser.
关键词密度检测Keyword Density Checker
粘贴文本或网页 HTML，统计词频和关键词密度，支持中英文，可选去除 HTML 标签，全部本地分析。Paste text or page HTML to compute word frequency and keyword density (Chinese & English), optionally stripping HTML, all local.
Meta 标签分析Meta Tag Analyzer
粘贴网页 HTML，分析 title、description、keywords、canonical、Open Graph、viewport、H1 等 SEO 要素并给出建议，本地解析。Paste page HTML to analyze title, description, keywords, canonical, Open Graph, viewport, H1 and more, with SEO hints — parsed locally.
WebSocket 在线测试WebSocket Tester
在线测试 WebSocket 连接：填写 ws:// 或 wss:// 地址，连接后可发送和接收消息并查看日志（HTTPS 页面只能连 wss）。Test WebSocket connections: enter a ws:// or wss:// URL, connect, send and receive messages with a live log (HTTPS pages can only use wss).
网页定时刷新Auto Page Refresh
在新标签页中定时自动刷新指定网址，可用于监控页面或仪表盘。请合理使用，切勿用于刷流量。Open a URL in a new tab and reload it on a timer — handy for dashboards or monitoring. Please use responsibly; do not use it to fake traffic.
Whois 域名查询Whois / RDAP Lookup
在线查询域名的注册信息（注册商、状态、创建/到期时间、DNS 服务器），通过公共 RDAP 接口（rdap.org）查询。Look up domain registration info (registrar, status, creation/expiry dates, nameservers) via the public RDAP service (rdap.org).
带宽与下载时间计算器Bandwidth Calculator
在文件大小、带宽（网速）和传输时间之间互算：例如 5 GB 文件在 100 Mbps 下要下载多久，或者 1 小时内传完 50 GB 需要多大带宽；可设置网络开销，区分 MB 与 MiB、Mbps 与 MB/s。Work out download time, required bandwidth or transferable data from the other two — how long 5 GB takes at 100 Mbps, or what speed moves 50 GB in an hour — with protocol overhead and proper MB vs MiB and Mbps vs MB/s handling.
IPv6 转二进制IPv6 to Binary Converter
把 IPv6 地址转换为 128 位二进制：自动展开 :: 缩写，支持内嵌 IPv4（::ffff:192.0.2.1）和 /前缀长度，可按 16 位分组显示并标出网络位。每行一个地址。Convert IPv6 addresses to 128-bit binary. :: shorthand is expanded, embedded IPv4 (::ffff:192.0.2.1) and /prefix lengths work, and output can be grouped by 16-bit hextet with the network bits marked. One address per line.
SSE 测试器SSE Tester
用 EventSource 连接 Server-Sent Events 地址，实时查看消息。可设置「SSE URL」。Connect to a Server-Sent Events URL with EventSource and watch messages live. Settings: SSE URL.
域名年龄查询（批量）Domain Age Checker
批量查询域名的注册时间和年龄：通过公共 RDAP 注册数据接口获取创建日期、到期日期和注册商，自动计算已注册多少年、多少天以及距离到期还有多久，一次最多 20 个域名。Check how old domains are, in bulk: creation date, expiry date and registrar come from the public RDAP registration-data service, and the tool works out the age in years and days and the time left until expiry — up to 20 domains at once.
二进制转 IPv6 地址（128 位二进制转换）Convert Binary to IPv6
把 128 位二进制数转换成 IPv6 地址，同时给出完整写法（8 组 4 位十六进制）和 RFC 5952 标准压缩写法（去掉前导 0、最长的连续 0 组写成 ::）。二进制里可以带空格、冒号、点或下划线分组，每行一个地址；不足 128 位时可选择右侧补 0 并加上前缀长度（如 /64）。适合网络课程、子网规划和抓包分析，数据在本地处理。Convert 128-bit binary numbers into IPv6 addresses, in both the full form (8 groups of 4 hex digits) and the RFC 5952 compressed form (leading zeros dropped, the longest run of zero groups written as ::). Spaces, colons, dots or underscores may group the bits, one address per line. For fewer than 128 bits you can pad on the right with zeros and add the prefix length (e.g. /64). Handy for networking courses, subnet planning and packet analysis. Processed locally.
关键词密度Keyword Tool
统计文本中的词频和关键词密度：支持多词短语、中文分词，don't 这样的缩写算一个词。本地处理。Count word frequency and keyword density: multi-word phrases, Chinese word segmentation, and contractions such as don't count as one word. Processed locally.
Google 收录检查（链接）Google Index Checker
把网址整理成 Google site: 搜索链接：自动去重、补全和校验网址（不查询 Google API）。本地处理。Turn URLs into Google site: search links, with duplicates removed and each URL normalised and checked (does not call Google APIs). Processed locally.
Cookie 解析格式化Cookie Parser & Formatter
把浏览器复制的 Cookie 请求头或 Set-Cookie 响应头解析成清晰的表格、JSON，或者一键生成 document.cookie 的 JavaScript 代码，支持自动 URL 解码。Parse a Cookie request header or Set-Cookie response headers into a readable table or JSON, or generate document.cookie JavaScript code, with optional URL decoding.
robots.txt 规则测试robots.txt Tester
粘贴 robots.txt 内容，输入一个或多个网址和爬虫名称，立即判断是否允许抓取，并指出命中的是哪一行规则；按 RFC 9309 标准（与 Google 一致）的最长匹配规则计算。Paste a robots.txt, enter one or more URLs and a crawler name, and instantly see whether each URL may be crawled and which line decided it — using the RFC 9309 longest-match rules that Google follows.