# Internet connectivity disruption in Vietnam

**Country:** 🇻🇳 Vietnam (VN)
**Date:** 2026-09-02
**Type:** Mixed
**Severity:** CRITICAL
**Status:** active

## Summary

IODA detected significant connectivity drop in Vietnam. 35 critical alerts recorded. CenAlert confirms censorship activity.

## Metrics

- Confidence: 75%
- Measurements: 35
- Anomaly Rate: 23.3%

## Evidence

- **IODA** (alert): IODA detected critical level outage for Hòa Bình
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Vĩnh Long
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Lai Chau
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Yên Bái
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Nam Định
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Đồng Bằng Sông Hồng
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Sóc Trăng
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Ninh Thuận
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Đông Bắc
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Tiền Giang
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Hà Giang
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Quảng Ninh
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Bình Dương
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Khánh Hòa
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Gia Lai
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Cao Bằng
  - Observed: 2026-09-02
  - Confidence: 75%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Thái Bình
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Bắc Giang
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Phú Thọ
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Vĩnh Phúc
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Bắc Ninh
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Hải Phòng
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Hải Dương
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Thái Nguyên
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Thanh Hóa
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Tuyên Quang
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Long An
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Đông Nam Bộ
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Bình Thuận
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Thừa Thiên - Huế
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Quàng Nam
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Unknown Region in Viet Nam
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Bình Định
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Đắk Nông
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **IODA** (alert): IODA detected critical level outage for Kon Tum
  - Observed: 2026-09-02
  - Confidence: 65%
  - [IODA live national dashboard (not a per-event permalink)](https://ioda.inetintel.cc.gatech.edu/country/VN)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for bbc.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 5/5 probes anomalous (100.0%) for chat.openai.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for chatgpt.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for claude.ai
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for facebook.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for gemini.google.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for getlantern.org
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 4/4 probes anomalous (100.0%) for google.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for huggingface.co
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for instagram.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for medium.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for nytimes.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for openai.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for protonvpn.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for psiphon.ca
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for reddit.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for signal.org
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for substack.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for telegram.org
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for theguardian.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 18/18 probes anomalous (100.0%) for tiktok.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for tumblr.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 4/4 probes anomalous (100.0%) for twitter.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for whatsapp.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)
- **CENSOREDPLANET** (dns-probe): DNS blocking detected: 3/3 probes anomalous (100.0%) for youtube.com
  - Observed: 2026-09-02
  - Confidence: 90%
  - [CensoredPlanet raw-data portal (no per-measurement permalink)](https://data.censoredplanet.org)

## 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.
- **The mechanism** — we cannot state whether this was DNS tampering, TLS/SNI reset, HTTP blockpage, throttling, or an infrastructure outage.
- **A confirmed duration** — we report the observation window, not a verified start/stop of any block.
- **Sub-national scope** — measurement is aggregated at the country level; we cannot localize to a province, city, or network segment.

## Data Sources

ioda, censoredplanet

## Citation

Voidly Research. (2026). Internet connectivity disruption in Vietnam [VN-2026-0966]. Retrieved from https://voidly.ai/incident/VN-2026-0966

---
*Report generated by Voidly Research on 2026-09-03*
*Data licensed under CC BY 4.0*
*Incident ID: VN-2026-0966*
*Permalink: https://voidly.ai/incident/VN-2026-0966*