Internet Outage Patterns 2026: When, Where, and Why Outages Happen

What Causes Internet Outages: 2026 Data

Internet outages have multiple distinct causes with very different patterns, durations, and mitigation strategies. Understanding which type of outage you are experiencing determines whether you can do anything about it — or whether you simply wait.

Outage Cause Distribution (Q1 2026)

• Fiber cut / physical damage (28% of outage events): Most common for fiber ISPs. Causes include construction accidents, weather events (ice on aerial fiber), and vehicle strikes on utility poles. Average duration: 3.2 hours. Peak season: winter (ice storms) and summer construction season.
• Power outage / UPS failure (22%): Network equipment requires power. Extended power outages eliminate both power and internet. Average duration: 5.7 hours (correlated with power restoration time). Prevalent in hurricane and severe storm corridors.
• BGP routing misconfiguration (17%): An ISP or upstream provider publishes incorrect routing tables, causing traffic to be black-holed or misrouted. Average duration: 47 minutes. Often affects multiple ISPs simultaneously (if the misconfigured party is a major backbone provider). Facebook's 2021 outage is the canonical example.
• DDoS attack on ISP infrastructure (12%): Large volumetric attacks targeting ISP DNS resolvers or peering points can degrade service for entire regions. Average duration: 28 minutes (ISPs have mitigation systems). More common for DNS-specific attacks.
• Software/firmware update failure (11%): Automated fiber node or CMTS updates that go wrong. Often auto-recovers after rollback. Average duration: 22 minutes.
• Undersea cable cut (7%): Affects international connectivity primarily. Countries with single or dual undersea cable connections face extended outages. Average duration: 14 days (cable repair ship response time).
• Other / unknown (3%): Includes signal degradation from weather, RF interference, and undisclosed ISP infrastructure issues.

Which ISPs Have the Fewest Outages?

From our outage detection data: Fiber ISPs (Google Fiber, Verizon Fios, AT&T Fiber) show 78% fewer outage events per 1,000 users than cable ISPs. This aligns with fiber's physical resilience advantages — fiber doesn't corrode, isn't susceptible to electrical interference, and is less vulnerable to coaxial amplifier failures that cascade through cable networks. The single biggest predictor of ISP reliability in our data is the percentage of their network that has been converted from coaxial to fiber infrastructure.