# Sustained censorship in SG (2026-03)

**Country:** 🇸🇬 Singapore (SG)
**Date:** 2026-03-01
**Type:** Censorship
**Severity:** CRITICAL
**Status:** confirmed

## Summary

OONI detected 45 days of elevated network interference averaging 71.2% anomaly rate.

## Metrics

- Confidence: 80%
- Measurements: 45
- Anomaly Rate: 71.2%

## Evidence

- **OONI** (measurement): OONI http_invalid_request_line: 5/9 measurements anomalous (55.6%)
  - Observed: 2026-03-30
  - Confidence: 72%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-30&until=2026-03-30&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 6/9 measurements anomalous (66.7%)
  - Observed: 2026-03-30
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-30&until=2026-03-30&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 4/6 measurements anomalous (66.7%)
  - Observed: 2026-03-30
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-30&until=2026-03-30&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 4/6 measurements anomalous (66.7%)
  - Observed: 2026-03-30
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-30&until=2026-03-30&only=anomalies)
- **OONI** (measurement): OONI tor: 1/1 measurements anomalous (100.0%)
  - Observed: 2026-03-29
  - Confidence: 90%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=tor&since=2026-03-29&until=2026-03-29&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 1/1 measurements anomalous (100.0%)
  - Observed: 2026-03-29
  - Confidence: 90%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-29&until=2026-03-29&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 1/1 measurements anomalous (100.0%)
  - Observed: 2026-03-28
  - Confidence: 90%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-28&until=2026-03-28&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 2/3 measurements anomalous (66.7%)
  - Observed: 2026-03-23
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-23&until=2026-03-23&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 2/3 measurements anomalous (66.7%)
  - Observed: 2026-03-22
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-22&until=2026-03-22&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 5/8 measurements anomalous (62.5%)
  - Observed: 2026-03-14
  - Confidence: 75%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-14&until=2026-03-14&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 5/8 measurements anomalous (62.5%)
  - Observed: 2026-03-14
  - Confidence: 75%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-14&until=2026-03-14&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 2/2 measurements anomalous (100.0%)
  - Observed: 2026-03-14
  - Confidence: 90%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-14&until=2026-03-14&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 2/2 measurements anomalous (100.0%)
  - Observed: 2026-03-14
  - Confidence: 90%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-14&until=2026-03-14&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 1/2 measurements anomalous (50.0%)
  - Observed: 2026-03-12
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-12&until=2026-03-12&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 2/2 measurements anomalous (100.0%)
  - Observed: 2026-03-12
  - Confidence: 90%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-12&until=2026-03-12&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 3/4 measurements anomalous (75.0%)
  - Observed: 2026-03-12
  - Confidence: 80%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-12&until=2026-03-12&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 3/4 measurements anomalous (75.0%)
  - Observed: 2026-03-12
  - Confidence: 80%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-12&until=2026-03-12&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 2/4 measurements anomalous (50.0%)
  - Observed: 2026-03-10
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-10&until=2026-03-10&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 2/4 measurements anomalous (50.0%)
  - Observed: 2026-03-10
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-10&until=2026-03-10&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 4/5 measurements anomalous (80.0%)
  - Observed: 2026-03-10
  - Confidence: 82%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-10&until=2026-03-10&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 4/5 measurements anomalous (80.0%)
  - Observed: 2026-03-10
  - Confidence: 82%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-10&until=2026-03-10&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 2/3 measurements anomalous (66.7%)
  - Observed: 2026-03-10
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-10&until=2026-03-10&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 2/3 measurements anomalous (66.7%)
  - Observed: 2026-03-10
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-10&until=2026-03-10&only=anomalies)
- **OONI** (measurement): OONI signal: 3/5 measurements anomalous (60.0%)
  - Observed: 2026-03-09
  - Confidence: 74%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=signal&since=2026-03-09&until=2026-03-09&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 2/3 measurements anomalous (66.7%)
  - Observed: 2026-03-09
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-09&until=2026-03-09&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 3/4 measurements anomalous (75.0%)
  - Observed: 2026-03-09
  - Confidence: 80%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-09&until=2026-03-09&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 3/3 measurements anomalous (100.0%)
  - Observed: 2026-03-09
  - Confidence: 90%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-09&until=2026-03-09&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 1/1 measurements anomalous (100.0%)
  - Observed: 2026-03-09
  - Confidence: 90%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-09&until=2026-03-09&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 1/1 measurements anomalous (100.0%)
  - Observed: 2026-03-09
  - Confidence: 90%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-09&until=2026-03-09&only=anomalies)
- **OONI** (measurement): OONI telegram: 1/2 measurements anomalous (50.0%)
  - Observed: 2026-03-06
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=telegram&since=2026-03-06&until=2026-03-06&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 2/4 measurements anomalous (50.0%)
  - Observed: 2026-03-05
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-05&until=2026-03-05&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 4/6 measurements anomalous (66.7%)
  - Observed: 2026-03-05
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-05&until=2026-03-05&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 4/6 measurements anomalous (66.7%)
  - Observed: 2026-03-05
  - Confidence: 77%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-05&until=2026-03-05&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 3/5 measurements anomalous (60.0%)
  - Observed: 2026-03-05
  - Confidence: 74%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-05&until=2026-03-05&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 3/5 measurements anomalous (60.0%)
  - Observed: 2026-03-05
  - Confidence: 74%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-05&until=2026-03-05&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 5/7 measurements anomalous (71.4%)
  - Observed: 2026-03-04
  - Confidence: 79%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-04&until=2026-03-04&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 5/7 measurements anomalous (71.4%)
  - Observed: 2026-03-04
  - Confidence: 79%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-04&until=2026-03-04&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 1/2 measurements anomalous (50.0%)
  - Observed: 2026-03-03
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-03&until=2026-03-03&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 1/2 measurements anomalous (50.0%)
  - Observed: 2026-03-03
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-03&until=2026-03-03&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 3/6 measurements anomalous (50.0%)
  - Observed: 2026-03-03
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-03&until=2026-03-03&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 3/6 measurements anomalous (50.0%)
  - Observed: 2026-03-03
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-03&until=2026-03-03&only=anomalies)
- **OONI** (measurement): OONI http_invalid_request_line: 2/4 measurements anomalous (50.0%)
  - Observed: 2026-03-02
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_invalid_request_line&since=2026-03-02&until=2026-03-02&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 2/4 measurements anomalous (50.0%)
  - Observed: 2026-03-02
  - Confidence: 70%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-02&until=2026-03-02&only=anomalies)
- **OONI** (measurement): OONI facebook_messenger: 1/1 measurements anomalous (100.0%)
  - Observed: 2026-03-01
  - Confidence: 90%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=facebook_messenger&since=2026-03-01&until=2026-03-01&only=anomalies)
- **OONI** (measurement): OONI http_header_field_manipulation: 1/1 measurements anomalous (100.0%)
  - Observed: 2026-03-01
  - Confidence: 90%
  - [OONI Explorer (independently verifiable)](https://explorer.ooni.org/search?probe_cc=SG&test_name=http_header_field_manipulation&since=2026-03-01&until=2026-03-01&only=anomalies)

## What we cannot say

- **Who caused it** — measurement data alone does not attribute the interference to any government, ISP, or other actor.
- **Intent** — anomalous or unreachable measurements indicate interference, not a stated motive or a deliberate-vs-incidental determination.
- **Which networks** — no specific ASN/ISP is identified for this incident.
- **Sub-national scope** — measurement is aggregated at the country level; we cannot localize to a province, city, or network segment.
- **Independent corroboration** — this rests on a single source; treat it as a single-source signal, not a multi-source confirmation.

## Data Sources

ooni

## Citation

Voidly Research. (2026). Sustained censorship in SG (2026-03) [SG-2026-0183]. Retrieved from https://voidly.ai/incident/SG-2026-0183

---
*Report generated by Voidly Research on 2026-06-21*
*Data licensed under CC BY 4.0*
*Incident ID: SG-2026-0183*
*Permalink: https://voidly.ai/incident/SG-2026-0183*