Denpa / Privacy policy / Mac
Last updated: 2026-09-23 / Applies to: Denpa Network Check (Mac)
This is a translation of the Japanese privacy policy. If the two differ, the Japanese version applies.
This is the privacy policy for the Mac version. The permissions work differently from the iPhone version, so there is a separate page. For the iPhone version, see here. Privacy policy index
Denpa Network Check (Mac) is a macOS app that records what your Wi-Fi signal is doing and measures the state of your internet connection so you can narrow down where a problem is. This page explains what information the app handles, and what network traffic measuring generates.
Measuring speed and response time cannot happen without real network traffic. The destinations are listed below.
| Purpose | Destination |
|---|---|
| Speed test (download and upload) | Cloudflare (speed.cloudflare.com). The destination cannot be changed in the Mac version |
| Response time to the internet | Ten ICMP requests to 1.1.1.1 (Cloudflare public DNS) |
| Checking whether the connection requires a sign-in | captive.apple.com (Apple’s connectivity check page) |
| Checking for proxy authentication | One HEAD request to https://speed.cloudflare.com/__down |
| DNS lookup time | One HTTPS HEAD request to each of www.apple.com, www.google.com, and www.yahoo.co.jp, sent in parallel; only the time the name lookup took is taken from them. The lookup goes through the route macOS already uses, and the app never specifies a DNS server |
| Response time to the first device (your router) | An address on your own network, such as your router |
| Page measurement (the Page screen) |
The site at the URL you enter. Like a browser, it connects to that page and to the external resources the page loads. Where it connects depends on what you enter; the app never chooses the destination. If you do not use this screen, none of this traffic occurs |
These destinations see your IP address, because they are the other end of the connection (this is unavoidable on the internet). The app does not attach any information that identifies you.
The manufacturer shown in the list of nearby networks is looked up in the IEEE registry (53,549 entries) that is bundled with the app. No request goes out. The list is refreshed only when the app is updated.
You can choose in Settings how much data one speed test uses. Download and upload use the same amount.
| Setting | Each direction | Total per run |
|---|---|---|
| Small (S) | 5 MB | 10 MB |
| Medium (M, default) | 20 MB | 40 MB |
| Large (L) | 30 MB | 60 MB |
| Permission | What it is for | Without it |
|---|---|---|
| Location (while using the app) |
macOS requires it so the app can read the network name (SSID), the address (BSSID), the country code, and what the access points broadcast (channel utilization, standard, encryption, and so on). The location itself is not used. It is never recorded or sent | The network name and address are not shown. The table of nearby networks becomes a list without names, and channel utilization and the least busy channels are not shown either. Signal strength, noise, and the channel number can still be read without it |
| Local Network | macOS requires it so the app can send ICMP to your router, the first device on the path | Quality to the router cannot be measured. A notice appears on screen with a button that opens System Settings. Measurements toward the internet — speed, response time, and DNS — work without it |
The app works without either of them. It can measure less, by exactly what the table above says.
Note how this differs from the iPhone version. On iPhone, the first device can be measured even without Local Network access. On the Mac, the router cannot be measured without it.
For questions about this policy, write to the address below.
Replies may take some time.
For how to use the app, or to report a problem, see the support page.
Denpa