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IRAN BLOCK

Censorship Detection

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OONI probe measurements from inside Iran showing which services are blocked or accessible.

Reading this data

OONI measures network-level anomalies from probes inside Iran. A low anomaly rate doesn't mean a service works normally — Iran uses DPI and protocol-level filtering that basic connectivity tests may not catch.

Anomaly rate = percentage of OONI tests that showed interference. Use it as an indicator of censorship activity, not a verdict on usability.

services:0
Blocked:0
Partial Block:0
Probe OK :: Not Safe:0
Probe OK :: Not Safe (<30%)

Probe connections succeeded, but the service may still be blocked via DPI, protocol filtering, or throttling — methods that basic connectivity tests don't detect.

Partial Block (30–80%)

More than 30% of OONI tests returned anomalies. Censorship is present but not universal across all test runs.

Blocked (>80%)

Over 80% of OONI tests detected interference. The service is consistently blocked across multiple test runs and probe locations.

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Newly blocked · last 7 days

Domains whose OONI anomaly rate crossed 80 % from under 50 % — or the reverse — on at least five measurements each side. What moved, not what has always been blocked.

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Censored Planet — Active Scan Dataset

Explore outcomes by network →

Censored Planet runs automated scans from thousands of vantage points using HTTP/HTTPS, DNS, and TCP measurement methods. Their dataset covers millions of domains and provides a broad view of blocking across protocols.

IranBlock stores the observatory’s published outcome rows once a day. Scans land about twice a week, so a window with no bars is a window with no scan, not an all clear.

Hyperquack HTTP
Sends HTTP requests through vantage points inside Iran and checks whether responses are manipulated.
Hyperquack HTTPS
Checks for TLS handshake interference, including MITM certificate injection and connection resets.
Satellite DNS
Compares DNS responses from Iranian resolvers against trusted baselines to detect injection or tampering.
Augur TCP
Uses a TCP side-channel technique to infer IP-level blocking without needing a probe inside Iran.

Data source: OONI (Open Observatory of Network Interference) — api.ooni.io