Mongolia Experiences Internet Connectivity Degradation

Mongolia experienced a significant internet connectivity degradation on June 20, 2026. The disruption began at approximately 11:40 UTC and lasted for over two hours, with the most severe impact recorded around 12:20 UTC. The primary technical signal affected was ICMP reachability across the country’s IPv4 address space.

Technical Details

The degradation lasted approximately 2.2 hours, concluding around 13:50 UTC. The event registered a severity score of 10,105, with the most intense period scoring 8,666. The ping-slash24 signal, which measures ICMP reachability across IPv4 /24 prefixes, showed a drop of 96% from its peak value during the event. Other network signals, including traffic volume forecasts and backscatter measurements, also recorded deviations from their expected baselines. The Border Gateway Protocol (BGP) control plane, responsible for routing visibility, remained stable throughout the incident.

Reported Cause

The cause has not been publicly attributed.

Network connectivity was reported restored by the end of the observation window.