SentryFi- SentryFi
- Connection check
Free tool · no sign-up
Is my connection safe?
A quick look at what any website can see about your connection right now: encryption, the network you come from and what your browser gives away. It runs in a few seconds and nothing is saved.
Your results are below.
Analyzing your connection…
Results
This page reached you over HTTPS Looks good
Your browser checked our certificate and encrypted the connection, so the Wi-Fi or network in between can’t read or change this page.
What to do: Nothing. Keep an eye on the padlock and never click through a certificate warning.
Modern encryption (TLS 1.3) Looks good
Your browser and our server agreed on TLS 1.3, the current version of the protocol behind HTTPS.
What to do: Nothing to do.
Looks like a VPN, privacy relay or data center Looks good
Websites see Anthropic, PBC, not your home or mobile provider. That usually means a VPN, iCloud Private Relay or a work network.
What to do: If you didn’t turn on a VPN or relay, ask who manages this network or device.
What our server sees
This is the information every website you open gets from your connection. It is shown only to you.
| Your IP address | 216.73.216.188 |
|---|---|
| Country (from IP) | United States (US) |
| Network | Anthropic, PBC · AS16509 |
| Time zone (from IP) | America/New_York |
| TLS version | TLSv1.3 |
| TLS cipher | AEAD-AES256-GCM-SHA384 |
| HTTP version | HTTP/2 |
| Round trip to our server | 2 ms |
What each check means
- HTTPS: the page came to you encrypted and your browser verified our certificate.
- TLS version: TLS 1.3 is the current standard; 1.2 is fine but older; anything below is outdated.
- WebRTC: whether your browser hands your local network address (or your real IP behind a VPN) to any site. We run this with no outside STUN server, so it tests only what your browser exposes on its own.
- Network type: a simple guess from your IP’s network owner: VPN, relay or data center versus a home or mobile provider. It can be wrong.
- Time zone: whether your device’s time zone matches the one for your IP’s location. A mismatch is a common VPN sign.
What this check can’t tell you
- DNS leaks. Testing which DNS servers answer for you needs our own DNS test servers; this page doesn’t run one. See Is my DNS leaking?
- Someone on your local network. A website can’t see other devices on your Wi-Fi or watch for snooping on it.
- Fake hotspots. An “evil twin” Wi-Fi that copies a real name looks normal from the outside. This page can’t reliably tell.
- Inspection proxies. If a company proxy or antivirus decrypts your traffic, we see its connection, not your browser’s. The TLS result then describes that proxy.
- Your device. Nothing here can find malware or a risky app on your phone or computer.
- A guess, not a verdict. Network type is based on public network names. Lists change and a green result is not a promise of safety.
Frequently asked questions
Does this tool save my IP address?
No. The page shows you what our server sees about your request and does not save or log the result. There are no accounts, cookies or third-party services in the check. Like any website, our host (Cloudflare) processes your IP address to deliver the page.
Can this tell me if a public Wi-Fi network is safe?
Only partly. It shows how your connection looks from the outside (encryption, network type, browser leaks). It cannot see the Wi-Fi network itself, so it cannot spot a fake hotspot, DNS tampering or someone else on the same network. The SentryFi app checks the network from your phone.
What is a WebRTC leak?
WebRTC lets browsers make video calls. In older browsers, any website could use it to read your device’s local network address, or your real IP behind a VPN. Current browsers hide the local address behind a random .local name. This check runs WebRTC with no outside server and shows what your browser reveals.
Why does a time zone mismatch matter?
Your device’s time zone and your IP’s location usually match. If they don’t, you may be traveling, using a VPN, or have the wrong time zone set. Websites can use the mismatch to guess that you use a VPN.
Does TLS 1.3 mean my connection is private?
It means the link between your browser and our server is encrypted with the current standard. It does not hide which sites you visit from your network, and it does not protect a device that is already compromised.
