4 tools in one page — What's My IP, IP geolocation, WHOIS & domain availability. Instant, free, no account.
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What's My IP
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IP Lookup
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WHOIS Lookup
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Domain Check
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Detecting your IP address…
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Other TLDs
IP Lookup & WHOIS: The Developer's Go-To Network Diagnostic Toolkit
Every device connected to the internet has an IP address — a numerical label that identifies it within the network and carries metadata about its approximate location, ISP, and connection type. Knowing your own IP address is essential for tasks like setting up remote access, configuring firewall allowlists, verifying VPN connectivity, or simply troubleshooting why a service says you are in the wrong country. The "What's My IP" tool on this page detects your public IP address instantly and displays the associated geolocation data — country, city, region, ISP, and timezone — sourced from the ip-api.com database which covers over 99% of the global IPv4 address space.
The IP Lookup tool lets you investigate any IP address: trace the origin of a suspicious connection in your server logs, verify where a CDN edge node is located, or check whether a flagged IP belongs to a known hosting provider or residential connection. WHOIS lookup — now queried via the modern RDAP protocol rather than the legacy WHOIS port-43 system — returns structured data about any registered domain: who the registrar is, when the domain was created, when it expires, and which name servers it points to. This information is publicly available in the global domain registration database and is essential for due diligence when buying a domain, investigating phishing attempts, or auditing a vendor's online presence.
The domain availability checker uses the same RDAP infrastructure: if a domain name returns no registration record, it is likely available to register. When availability is confirmed, we surface direct links to major registrars so you can secure your domain immediately. All four tools make API calls to reputable public data sources — your queries are not logged, stored, or associated with your account on any of our systems.
Frequently Asked Questions
Why does my IP show the wrong city or country?
IP geolocation is an estimate, not GPS-level precision. Accuracy varies: country-level is correct ~99% of the time; city-level is roughly 55–80% accurate for most ISPs. Common reasons for incorrect data include VPN or proxy usage (which routes your traffic through a server in another location), mobile carriers that register IP blocks in a central city rather than your actual location, and corporate networks that route traffic through a headquarters datacenter. IPv6 addresses also have lower geolocation coverage than IPv4.
What is RDAP and how is it different from WHOIS?
WHOIS is a 40-year-old text-based protocol (port 43) that returns unstructured plain-text data — different registrars format it differently, making automated parsing error-prone. RDAP (Registration Data Access Protocol) is the modern JSON-based replacement standardized by ICANN in 2015. It returns structured data that is easier to parse, supports internationalized domain names properly, and allows better access control for privacy-redacted records. This tool uses RDAP via rdap.org, which aggregates responses from all major registries.
Why does domain availability say "likely available" instead of "available"?
The availability check works by querying the RDAP registry: if no record is found, the domain is almost certainly available. However, some TLDs have limited RDAP coverage, and premium or reserved domains may not appear in standard RDAP responses. "Likely available" reflects this uncertainty — always confirm through your chosen registrar before making business decisions based on availability.
Are my queries logged or stored?
We do not log or store your queries on any UserToolbox server. API calls go directly from your browser to ip-api.com (for IP lookups) and rdap.org (for domain/WHOIS lookups) — UserToolbox never sees the query parameters. The only data collected is standard anonymous page analytics (Google Analytics page views) with no personal or query data attached.
IP 查询与 WHOIS：开发者常备的网络诊断工具箱
每台联网设备都有一个 IP 地址，这个数字标识不仅确定了设备在网络中的位置，还携带了关于大致地理位置、运营商和连接类型的元数据。了解自己的 IP 地址在很多场景下不可或缺：配置远程访问、设置防火墙白名单、验证 VPN 是否正常工作，或者排查某个服务为什么显示你在错误的国家。本页面的"我的 IP"工具能即时检测你的公网 IP 地址，并显示关联的地理位置数据——国家、城市、地区、运营商和时区，数据来自 ip-api.com，覆盖全球 99% 以上的 IPv4 地址空间。
IP 查询工具让你可以调查任意 IP 地址：追踪服务器日志中可疑连接的来源、确认 CDN 边缘节点的位置、或者判断某个被标记的 IP 是属于已知托管服务商还是住宅用户。WHOIS 查询现在通过现代 RDAP 协议而非传统的 WHOIS port-43 系统进行，能返回任何已注册域名的结构化数据：注册商、创建时间、到期时间和 DNS 服务器。这些信息存储在全球域名注册数据库中，对于购买域名前的尽职调查、排查钓鱼攻击或审查供应商的在线身份至关重要。
域名可用性检查同样基于 RDAP 基础设施：如果某个域名没有注册记录，通常表示可以注册。查询确认可用后，页面会显示主要注册商的直达链接，让你能立即抢注。所有四项工具直接从你的浏览器向权威公开数据源发起 API 请求，UserToolbox 不会记录或存储你的查询内容。
常见问题
为什么显示的城市或国家不对？
IP 地理位置是估算值，不是 GPS 级别的精度。国家层面准确率约 99%；城市层面对大多数运营商约 55–80%。常见偏差原因：使用 VPN 或代理（流量经过其他国家的服务器）、移动运营商将 IP 段注册在某个中心城市而非实际位置、企业网络将流量统一路由到总部数据中心等。IPv6 地址的地理定位覆盖率也低于 IPv4。