Guam experienced a significant connectivity degradation lasting over two days, beginning on July 5 and ending early on July 8, 2026. The disruption primarily affected active network reachability, with a severity score of 69,026 recorded for the ping-slash24 signal. The event was observed between 18:30 UTC on July 7 and 00:30 UTC on July 8.
Technical Details
The primary affected signal was ping-slash24, which measures ICMP reachability across IPv4 /24 network prefixes. Its severity score peaked at 69,026, indicating a substantial drop in active probing success. The disruption lasted approximately 2.4 days.
Other measurement signals showed varied impacts. The gtr-norm signal, which tracks deviations from an expected traffic baseline, recorded a drop magnitude of -69% from its peak. The merit-nt signal, a proxy for aggregate connectivity from backscatter measurements, showed a -100% drop from its peak. The Border Gateway Protocol (BGP) control plane signal, which measures routing visibility for prefixes, showed minimal change with a -0% drop magnitude.
Reported Cause
The cause has not been publicly attributed.
Connectivity was reported restored by the end of the observation period.
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