Free network & IP tools — subnet calculator, IPv6, CIDR, VLSM, MAC lookup, DNS, WHOIS, latency.免费网络与 IP 工具 — 子网计算、IPv6、CIDR 聚合、VLSM 规划、MAC 查询、DNS、Whois、延迟测试。
See the public IP address you are browsing from, with IP version and decimal value.…
查询你当前上网的公网出口 IP，自动在多个 IP 回显服务间切换，并显示 IP 版本与十进制整数。…
Look up any IP address and get its country, city, ISP, ASN, coordinates and time zone.…
查询任意 IP 的归属地、运营商、自治系统号、经纬度与时区，同时离线给出整数、二进制与地址范围判定。…
Calculate network address, broadcast address, subnet mask, wildcard mask, usable host rang…
输入 IP 与前缀，算出网络地址、广播地址、子网掩码、通配符掩码、可用主机范围与主机数，支持 IPv4。…
Compress and expand IPv6 addresses, and work out network range, prefix and total addresses…
计算 IPv6 网络的压缩与完整写法、网络地址、起止地址、地址总数与掩码，支持 :: 压缩与内嵌 IPv4 …
Convert an IP address to decimal integer, binary or hexadecimal and back — IPv4 and IPv6.…
在 IP 地址与十进制整数、二进制、十六进制之间双向转换，自动识别 IPv4、IPv6、整数、0x 十六进制…
Check whether IPs are private, loopback, link-local, carrier-grade NAT, multicast, reserve…
批量判定 IP 属于私网、回环、链路本地、运营商级 NAT、组播、文档保留还是公网地址，IPv4 与 IPv…
Merge many CIDR blocks into the smallest set of supernets, or split a block into equal sub…
把多个 CIDR 网段合并成最少的超网，或按目标前缀拆分成等长子网，方便做路由汇总与地址规划。…
Give a base network and the hosts each subnet needs; get an automatic VLSM allocation with…
给定基础网段和每个子网需要的主机数，按标准 VLSM 算法从大到小自动分配，输出子网、掩码、可用范围与广播地…
Identify the manufacturer from a MAC address, convert between formats and generate random …
查询 MAC 地址对应的设备厂商，转换冒号、连字符、Cisco 点分等写法，并判断单播组播、是否本地管理，可…
Query DNS records over HTTPS (DNS-over-HTTPS) for any domain — A, AAAA, CNAME, MX, NS, TXT…
用 DNS over HTTPS 查询域名的各类解析记录，依次尝试阿里 DNS、Cloudflare 与 G…
Look up domain registration status, dates, registrar and nameservers through the public RD…
通过公开 RDAP 服务查询域名的注册状态、注册与到期时间、注册商与域名服务器，无需安装任何工具。…
Measure real HTTP round-trip time to any URL with min, average, max and success rate.…
连续多次请求目标网址，测出最小、平均、最大往返耗时与成功率。浏览器无法发 ICMP，因此用真实 HTTP 请…
Searchable reference of common TCP ports and HTTP status codes with explanations.…
速查 40 多个常见 TCP 端口与全部常用 HTTP 状态码，支持按端口号、服务名或关键词搜索。…
Decode a User-Agent string into browser, version, operating system, device type, engine an…
解析 User-Agent 字符串，识别浏览器及版本、操作系统、设备类型、渲染引擎，并判断是否爬虫。…