适用于 iOS 应用「netcat」 · 生效日期：2026 年 11 月 6 日
本应用不收集、不存储、不分享任何个人信息。应用没有用户账户，不包含任何统计分析、广告或追踪 SDK。
所有检测都从你的设备直接发出，发往你输入的服务器和主机（Whois 与公网 IP 查询另见下文）：DNS 检测与 DNS 查询发送 DNS 查询（使用系统解析器时，经由系统当前配置的 DNS 服务器）；Ping 与 MTR 发送 ICMP 回显请求或建立 TCP 连接，MTR 还会通过系统 DNS 反向解析沿途路由器的主机名；端口扫描只向你列出的端口尝试 TCP 连接；端口连接与你输入的主机和端口建立 TCP、UDP 或 TLS 连接，只发送你输入的数据；iPerf3 与你指定的 iperf3 服务器交换测试流量，或在你开启服务端模式时，与连接到你设备的 iperf3 客户端交换测试流量；Whois 从 IANA（data.iana.org）获取各注册机构的服务器列表，并把你查询的域名、IP 地址或 AS 号发给 IANA（rdap.iana.org、whois.iana.org）以及它指向的注册局和注册商服务器，或发给你指定的服务器；在“网络信息”里点“查询”时，应用通过 HTTPS 同时向国内的 ddnsip.cn、IPIP.net 和国外的 ident.me、Cloudflare（icanhazip.com）询问本机的公网 IP 地址，这些地址的归属地则在应用内置的 ip2region 数据库里离线查询，不会发往任何服务器。与任何网络工具一样，这些流量以及你的 IP 地址会被对应服务器、沿途路由器和你所在的网络看到。这些服务器由第三方运营，请参阅各服务商自己的隐私政策。开发者不会接收或经手这些数据。
你添加的服务器列表、最近的运行记录和应用设置仅保存在你的设备上，不会上传。删除应用即会清除这些数据。
只有当你对局域网内的设备（例如路由器、自建 DNS 或 iperf3 服务器）进行检测时，系统才会请求“本地网络”权限，该权限仅用于完成你发起的检测。
本应用不收集任何人的个人信息，包括儿童。
如本政策有更新，将在此页面发布。
For the iOS app “netcat” · Effective date: November 6, 2026
netcat does not collect, store or share any personal information. The app has no user accounts and contains no analytics, advertising or tracking SDKs.
All tests run directly from your device to the servers and hosts you enter, except as described for Whois and the public IP query: DNS checks and lookups send DNS queries (through the DNS servers configured on your device when you use the system resolver); Ping and MTR send ICMP echo requests or open TCP connections, and MTR looks up router names through your system’s DNS resolver; Port Scan only attempts TCP connections to the ports you list; Port Connect opens TCP, UDP or TLS connections to the host and port you enter and sends only the data you type; iPerf3 exchanges test traffic with the iperf3 server you specify, or, while you run it in server mode, with the iperf3 clients that connect to your device; Whois downloads the registries’ server lists from IANA (data.iana.org) and sends the domain, IP address or AS number you look up to IANA (rdap.iana.org, whois.iana.org) and to the registry and registrar servers it points to, or to the server you specify; when you tap Query in Network Info, the app asks ddnsip.cn and IPIP.net in China and ident.me and Cloudflare (icanhazip.com) outside China (over HTTPS) for your public IP addresses, and looks up where they are registered in the ip2region database inside the app, without sending them anywhere. As with any network tool, this traffic and your IP address are visible to those servers, to routers along the path and to your network. These servers are operated by third parties; please refer to their own privacy policies. The developer never receives or handles this data.
Your server list, recent runs and settings are stored only on your device and are never uploaded. Deleting the app removes them.
The Local Network permission is only requested when you test a device on your local network, such as your router, a self-hosted DNS server or an iperf3 server, and is used only for the test you start.
The app does not collect personal information from anyone, including children.
Updates to this policy will be posted on this page.