NetBlocks is an internet monitoring group that tracks connectivity disruptions by combining active network measurement with corroborating signals from other sources. It is used to observe whether internet access is degraded, partially lost, or restored across a region or provider.
In cyber security and incident response, this matters because outages are not always caused by malware. Physical attacks, power failures, routing problems, or damaged shared infrastructure can all reduce availability. NetBlocks-style telemetry helps defenders, researchers, and journalists confirm that a disruption is real and estimate its scope, even when the exact technical cause is still unclear. It is useful for spotting service degradation, comparing affected networks, and validating resilience plans such as failover and redundancy.