39件の記録されたインシデント

世界のインターネット障害
完全な歴史

1980年のARPANET崩壊から現在の海底ケーブル切断まで — レジリエントなネットワーク構築の礎となったインシデントの年代記。

BGPインシデント DNS障害 ケーブル切断 クラウド障害 DDoS攻撃 シャットダウン
スクロールして探索
2020s
Dec 5, 2025

Cloudflare brief global disruption from configuration error (reported)

≈25 minutes (reported)
影響
Global
根本原因
Human error, Misconfiguration
Bad config deployment affected request handling; rollback resolved quickly (reported).
"Short-lived outages/errors across many proxied sites."
CDN/Cloud services
Oct 19, 2025

AWS us-east-1 major cascade outage (DynamoDB/EC2) (reported)

≈15 hours (reported)
影響
Global (services depending on us-east-1)
根本原因
Software bug, Systemic cascade
Prior response claimed DynamoDB DNS/discovery issue cascaded into EC2 control plane disruption; not verified here.
"Large downstream app outages and delayed autoscaling/instance launches (reported)."
Cloud provider
Sep 6, 2025

Red Sea cable cuts (SMW4 & IMEWE) (reported)

Weeks (repairs)
影響
Middle East, South Asia, East Africa, Europe–Asia transit
根本原因
Unknown, Possible sabotage, Human error
Multiple cables cut; attribution unclear.
"Regional slowdowns and rerouting/latency increase."
Submarine cables
Jul 24, 2025

Starlink global outage (core software services failure) (reported)

≈2.5 hours (reported)
影響
Global Starlink footprint
根本原因
Unknown, Software bug (suspected)
Reported failure of internal software services operating the core network (provider statement reported by analysts).
"Connectivity loss for satellite users."
Satellite ISP (LEO)
Forrester Kentik
Jun 12, 2025

Cloudflare outage attributed to Workers KV incident (reported)

≈2.5 hours (reported)
影響
Global (Cloudflare customers)
根本原因
Software bug, Change error
Prior response claimed Workers KV cascade; not verified here.
"Customer API/control plane disruption; some site/app errors."
CDN/Cloud services Control plane / distributed storage
May 20, 2025

Global routing instability from malformed BGP attribute (Prefix-SID) (reported)

Minutes (reported)
影響
Global (multi-AS)
根本原因
Software bug, Misconfiguration
Malformed BGP attribute propagated; certain vendors allegedly crashed/reset sessions.
"Brief reachability issues for some networks; high routing churn."
BGP routing Router software interoperability
Jan 15, 2025

Targeted cable incidents around Taiwan (reported)

Weeks for local restoration (reported)
影響
Taiwan and offshore islands (reported)
根本原因
Possible sabotage, Hardware/physical failure
Incidents attributed to vessel activity; intent disputed.
"Local outages and increased geopolitical concern."
Submarine cables
Nov 17, 2024

Baltic Sea subsea cable disruptions (reported sabotage)

Repairs over weeks (reported); immediate impact rerouted
影響
Northern Europe (Finland, Sweden, Baltics, Germany links)
根本原因
Unknown, Possible sabotage
Near-simultaneous cable cuts raised suspicion; attribution uncertain.
"Reduced capacity and higher latency; national security concern."
Submarine cables
The Guardian AP News
May 12, 2024

East Africa subsea cable damage (SEACOM & EASSy) (reported)

Weeks (repairs into early June)
影響
East and Southern Africa
根本原因
Human error, Hardware/physical failure
Anchor drag / storm-related incident damaged multiple cables.
"Major slowdowns and partial outages; increased latency; business disruption."
Submarine cables
Internet Society Kentik
Feb 9, 2024

Red Sea subsea cable cuts linked to Rubymar (AAE-1 / EIG / SEACOM) (reported)

Weeks (repairs)
影響
Middle East, South Asia, East Africa, Europe–Asia transit
根本原因
Human error, Conflict-related incident
Anchor drag from damaged/drifting vessel reportedly severed multiple cables.
"Regional slowdown/outages; rerouting and latency spikes."
Submarine cables
CSIS
Jan 3, 2024

Orange Spain routing registry compromise / BGP disruption

Hours (reported)
影響
Spain (primarily)
根本原因
Cyberattack / credential compromise
RIPE registry account compromise enabled route origin record changes causing routing issues.
"Connectivity disruption for ISP customers and hosted services."
BGP routing IRR/RPKI management
APNIC Blog SecurityWeek
Nov 2, 2023

Portland (Flexential) data center power failure impacts Cloudflare & Workday

Hours to ~1 day+ for full restoration (varied by service)
影響
Global services with dependencies; physical location Portland, OR (USA)
根本原因
Hardware failure
Power system failure and cascading generator/utility issues caused facility-wide outage.
"Loss of visibility/control for customers; SaaS downtime for enterprises."
Data center/power infrastructure Cloud/CDN control-plane
Cloudflare Cloudflare
Jun 13, 2023

AWS us-east-1 outage (Lambda-related cascading impacts)

≈2 hours (reported)
影響
Global (apps depending on us-east-1)
根本原因
Software bug
Lambda capacity-management bug triggered at scale, affecting dependent AWS services.
"App outages and degraded performance across multiple brands."
Cloud provider Serverless platform
May 9, 2023

Pakistan mobile internet shutdown (political unrest)

≈3 days (reported)
影響
Pakistan (nationwide)
根本原因
Political or regulatory action
Government ordered mobile networks offline; social platforms blocked during unrest.
"Major societal and economic disruption; suppressed information flow."
Government shutdown Mobile data
Internet Society Pulse Al Jazeera
Apr 4, 2023

Virgin Media UK ISP outages (BGP withdrawals/internal failure)

Two major outages (hours each) reported same day
影響
United Kingdom
根本原因
Unknown, Routing/control-plane failure (suspected)
Routes withdrawn and traffic dropped at edge; internal failure led to customer disconnects.
"Nationwide consumer/business connectivity disruption."
ISP BGP routing
Feb 2, 2023

Matsu Islands (Taiwan) dual undersea cable cuts

Weeks (reported)
影響
Matsu Islands (Taiwan)
根本原因
Hardware/physical failure, Possible sabotage
Two cables severed in early February; attributed to vessel activity (disputed intent).
"Severe local connectivity loss; reliance on microwave/satellite fallback."
Submarine cable
Jan 25, 2023

Microsoft Azure & Microsoft 365 global outage (WAN routing incident)

Several hours (reported)
影響
Global
根本原因
Misconfiguration, Change error
Microsoft WAN routing change caused instability/route flaps impacting Azure and M365 services.
"Cloud and productivity suite disruptions affecting organizations worldwide."
Cloud provider WAN routing/BGP
ThousandEyes Practical365
Oct 25, 2022

Sudan protest-related national internet shutdown

≈8 hours (reported)
影響
Sudan (nationwide)
根本原因
Political or regulatory action
Authorities reduced/disabled connectivity during protests.
"Information suppression and disruption to services."
Government shutdown
Oct 19, 2022

Shetland Islands submarine cable cut (SHEFA-2)

≈14.5 hours (reported)
影響
Shetland Islands, Scotland (UK)
根本原因
Human error, Hardware/physical failure
Cable severed (often attributed to anchor/fishing activity).
"Local isolation; emergency services needed backups."
Submarine cable
The Guardian Shetland News
Sep 1, 2022

Iran protest-related internet shutdowns (curfews and regional blackouts)

Recurring daily hours + multi-day regional events
影響
Iran (nationwide and regional)
根本原因
Political or regulatory action
Authorities restricted/disabled mobile internet and platforms during protests.
"Communication suppression and economic disruption."
Government shutdown Mobile networks
Jul 8, 2022

Rogers Communications nationwide outage (Canada)

≈19–24 hours (major disruption)
影響
Canada (nationwide)
根本原因
Human error, Misconfiguration
Maintenance change removed a routing filter and triggered cascading routing/control-plane failures.
"Payment disruptions, emergency-call impacts, widespread societal disruption."
ISP/telecom core
ThousandEyes Government of Canada / CRTC
Oct 4, 2021

Facebook/Meta global outage (BGP + DNS reachability)

≈6 hours
影響
Global
根本原因
Human error, Misconfiguration
Backbone maintenance change withdrew BGP routes; DNS and internal tooling became unreachable, complicating recovery.
"Global disruption of messaging/social communications; business disruptions."
BGP routing DNS Private backbone
Engineering at Meta Cloudflare
2010s
Jun 24, 2019

Verizon BGP route leak impacting Cloudflare (and others)

≈1–2 hours
影響
Global
根本原因
Misconfiguration, Filtering failure
Customer route leak propagated through Verizon due to insufficient filtering; misrouting/blackholing ensued.
"Partial unreachability/slowness for many services; routing community alarm."
BGP routing
Cloudflare Cloudflare
Feb 28, 2017

AWS S3 outage (us-east-1) from operator error

≈4 hours
影響
Global (customers relying on us-east-1)
根本原因
Human error, Operational tooling/controls gap
Incorrect parameter in internal tool took down more S3 subsystems than intended; slow index recovery.
"Major web/app disruptions due to reliance on S3 in a single region."
Cloud provider Storage service
AWS The Guardian
Oct 21, 2016

Dyn DNS DDoS (Mirai botnet)

Intermittent over the day (multiple waves)
影響
North America, Europe, Global users of affected sites
根本原因
Cyberattack / DDoS
IoT botnet traffic overwhelmed Dyn’s DNS infrastructure.
"Widespread inability to resolve domains for major services."
DNS DDoS
ThousandEyes KrebsOnSecurity
Jan 27, 2011

Egypt nationwide internet shutdown (Arab Spring)

≈5 days (major blackout)
影響
Egypt (nationwide)
根本原因
Political or regulatory action
Government ordered ISPs to disconnect and withdraw routes to suppress protests.
"Severe societal and economic disruption; communications blackout."
Government shutdown BGP withdrawals
Wikipedia (overview) RIPE NCC (related analyses via RIPE Labs/archives)
Apr 8, 2010

China Telecom large-scale route leak/hijack (reported)

≈18 minutes (often reported)
影響
Global
根本原因
Misconfiguration, Disputed
Large number of prefixes announced via China Telecom; traffic detoured. Intent disputed.
"Potential traffic detours and risk of interception; user-visible impact unclear."
BGP routing
2000s
Feb 24, 2008

YouTube global outage via Pakistan Telecom BGP hijack

≈2 hours
影響
Global
根本原因
Political or regulatory action, Misconfiguration, Upstream filtering failure
Domestic blocking route advertised globally due to upstream propagation and insufficient filtering.
"Global unreachability of YouTube during incident window."
BGP routing Policy-driven filtering leak
Google Research CircleID
Jan 30, 2008

Mediterranean & Gulf submarine cable cuts (Middle East/South Asia disruption)

Days to weeks (repair dependent)
影響
Middle East, North Africa, South Asia (multi-country)
根本原因
Hardware/physical failure, Human error, Unknown
Multiple cable faults/cuts; some attributed to anchor drag, some unclear.
"Severe bandwidth reduction and international connectivity degradation."
Submarine cables
RIPE NCC Wikipedia
Dec 26, 2006

Taiwan (Hengchun) earthquake submarine cable breaks

Weeks (full repair reportedly ~49 days)
影響
East Asia / Asia-Pacific (Taiwan, China, Hong Kong, Japan, Singapore, etc.)
根本原因
Natural disaster
Undersea earthquake and landslides severed multiple major cables near Taiwan/Luzon Strait.
"Severe international connectivity degradation; high latency due to reroutes."
Submarine cables International backbone
Submarine Networks International Cable Protection Committee (PDF)
Jan 25, 2003

SQL Slammer worm

Hours (peak), with lingering effects over 1–2 days
影響
Global (notably Asia, North America, Europe)
根本原因
Cyberattack / malicious code, Software vulnerability
Worm exploited MS SQL Server vulnerability; explosive scanning caused congestion and outages.
"Severe congestion and widespread service disruptions."
Internet Cyber incident / traffic flood
NETSCOUT ASERT WeLiveSecurity (ESET)
1990s
May 19, 1998

Galaxy IV satellite failure

Days to ~1 week (varying by service)
影響
United States (nationwide), some Canada
根本原因
Hardware failure
Satellite control failure caused loss of service for pager/broadcast transponders.
"Mass pager outage affecting businesses and emergency communications."
Satellite communications
The Atlantic National Academies
Apr 13, 1998

AT&T frame relay cloud outage

Up to ≈26 hours for some customers
影響
United States (nationwide corporate WAN customers)
根本原因
Software bug, Change error
Software upgrade failure and error flooding caused network-wide instability.
"Corporate WAN disconnects; disrupted financial and airline operations (reported)."
Enterprise data network (Frame Relay)
Wired Los Angeles Times
Jul 17, 1997

“.com/.net DNS” outage (Network Solutions zone file error)

≈4 hours
影響
Global
根本原因
Human error
Corrupted/incorrect zone file update disrupted resolution for large numbers of domains.
"Large-scale name resolution failures; widespread site/email disruption."
DNS (TLD name servers)
BYTE (PDF) squid-cache.org
Apr 25, 1997

AS7007 BGP route leak

Hours (variously reported; not precisely captured here)
影響
Global
根本原因
Human error, Software bug, Misconfiguration
Misconfigured router and bug leaked more-specific routes and hijacked large portions of routing table.
"Widespread reachability problems due to misrouting/blackholing."
Internet backbone BGP routing
Wikipedia Cloudflare (PDF)
Jan 4, 1991

New York fiber cut disrupts multi-state communications

Hours (same-day restoration reported)
影響
US Northeast (New York, DC, Boston cited)
根本原因
Human error, Hardware/physical failure
Accidental severing of a major fiber trunk (construction/backhoe-style incident).
"Call blocking and disruptions to trading/aviation communications (reported)."
Fiber backbone (telecom/data)
Jan 15, 1990

AT&T long-distance network crash

≈9 hours
影響
United States (nationwide long-distance)
根本原因
Software bug
Faulty switch software update triggered cascading switch resets and signaling storms.
"Large-scale call failures; business disruption; delayed flights reported."
Telephony (PSTN long-distance) Switching network
Cal Poly (jdalbey) case study The Software Horror Picture Show (Uni Saarland)
1980s
Nov 2, 1988

Morris Worm outbreak

Days (major disruption over multiple days)
影響
Primarily US academic/military networks, Spillover impacts globally
根本原因
Cyberattack / malicious code, Software vulnerability, Human error
Self-replicating worm exploited weak passwords and vulnerabilities, saturating systems and networks.
"Severe network congestion and system outages; significant cleanup costs."
Internet (early TCP/IP) Cyber incident
Wikipedia CERT/CC (SEI)
Oct 27, 1980

ARPANET collapse (routing/IMP bug cascade)

≈4 hours
影響
United States (ARPANET nodes)
根本原因
Software bug
Status-message propagation and IMP error-handling/garbage-collection bug caused network-wide disruption.
"ARPANET connectivity loss across research sites."
Early Internet (ARPANET) Routing infrastructure
Computer History Museum VICE
2025 Cloudflare brief global disruption from configuration error (reported)

データに見るパターン

数十年にわたるネットワーク障害は、インターネットがどのように壊れるかの共通テーマを明らかにしています。

最も一般的な原因
Human error
13件のインシデント
最多発生の10年間
2020s
22件の記録されたインシデント
記録された総数
39
主要インシデント
期間
1980 – 2025
45年の歴史

歴史から学ぶこと

すべての大規模障害は、より耐障害性の高いシステム構築への教訓を残しています。

人的エラーが共通の原因

1990年のAT&T障害から2021年のFacebook障害まで、設定ミスや運用上のエラーは他のどの要因よりも多くの障害を引き起こしています。現代のネットワークの複雑さは、たった一つのタイプミスが世界中に連鎖する可能性があることを意味しています。

BGPはインターネットのアキレス腱であり続ける

ネットワーク間のトラフィックをルーティングするBorder Gateway Protocolは、暗黙の信頼が前提の時代に設計されました。数十年経った今もルートリークやハイジャックが続いているのは、RPKIなどのセキュリティ対策の導入が不完全だからです。

物理インフラは驚くほど脆弱

海底ケーブルは大陸間データの95%を運んでいますが、錨、地震、そして増加する意図的な妨害に対して脆弱です。紅海のような地理的なチョークポイントは依然として重大な障害点です。

集中化はシステミックリスクを生む

AWS us-east-1がダウンすると、インターネットの半分が影響を受けます。Cloudflareに問題が起きると、何百万ものウェブサイトにアクセスできなくなります。集中化による効率性の向上には、過大な障害モードが伴います。

次の障害があなたに影響を及ぼす前に

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