Subnet Calculator Privacy Policy
Your IP calculations stay on your device. We do not sell your data or use advertising or tracking SDKs.
Data used by the app
The app has no developer account system, analytics SDK, advertising SDK, or cross-app tracking. Version 1.3 adds a limited HTTPS time service used only to verify the 7-day trial.
IP addresses and calculations
IP addresses, prefixes, subnet masks, ranges, and calculation results entered or generated in the app remain on your device. They are not uploaded to us or shared with third parties.
Purchases and the 7-day trial
The optional 7-day trial, permanent unlock, and restore-purchase operations are handled by Apple's App Store through StoreKit. We do not receive your Apple Account credentials or payment details. Apple may provide aggregate sales reports that do not identify individual users. Apple's processing is governed by Apple's Privacy Policy.
Trial time verification
During the trial, each app launch requests the current time over HTTPS. The request contains a new random one-time value to prevent reuse of a cached response. It does not include entered IP addresses, calculation results, purchase receipts, Apple Account information, or a persistent device identifier. The service returns the time and that random value; it does not create a user profile or database record. The running app then measures elapsed time locally. Purchased access does not require this time service.
Network infrastructure
As with any HTTPS connection, network providers process technical connection information, including the connection's source IP address. The app's time service at subnet.baobaoben.com runs on our server in mainland China, supplied by 宁波卓智创新网络科技有限公司. Request access and request error logs for this endpoint are disabled. We retain system startup and certificate-renewal diagnostics, not individual time requests. Infrastructure providers may still process network security records. No calculation inputs, accounts, or persistent device identifiers are sent to this service. This support and privacy website is hosted by Cloudflare under its Privacy Policy. We do not use technical connection information for advertising, profiling, or cross-app tracking.
Local device storage
The app may store purchase entitlement status and limited anti-tampering timing information locally on your device so it can determine trial access. This information is not transmitted to the developer. Deleting the app removes ordinary local app data; purchase eligibility and restoration are determined by Apple's verified transaction history.
Third parties and advertising
The app has no advertising, social features, user-generated content, or third-party analytics. It is a general-purpose networking utility.
Your privacy rights
We do not maintain user profiles or a database of your calculation inputs. Contact us below with questions about the limited technical processing needed to operate the time service. If you email support, we use the information you choose to send to respond to your request.
中文说明
IP 地址、掩码、范围和计算结果均保留在设备本地，不上传。自 1.3 起，7 天试用期间每次启动会通过 HTTPS 获取当前时间，请求只包含一次性的随机值，不包含购买凭证、Apple 账户或持久设备标识。验证后，本次使用可离线计算；永久解锁在本机恢复验证后无需连接我们的校时服务。校时服务部署在宁波卓智创新网络科技有限公司提供的中国大陆服务器上，域名为 subnet.baobaoben.com，已关闭接口逐次访问及请求错误日志，仅保留系统启动、证书续期等运维记录，不保存逐次校时请求。网络服务商仍需处理连接所必需的技术信息（包括来源 IP），基础设施安全记录仍可能保留。此支持与隐私网站由 Cloudflare 托管。我们不将这些信息用于广告、用户画像或跨应用跟踪。
Changes
If the app's privacy practices change, this page will be updated before the change takes effect.
Contact
Questions about this policy can be sent to linfuci51@gmail.com.