Montenegro experiences internet connectivity disruption

Montenegro experienced a significant internet connectivity disruption on Friday, June 20, 2026, affecting reachability to a large portion of its IPv4 address space. The event began at 12:20 UTC and lasted approximately one and a half hours, ending by 13:50 UTC.

Technical Details

The primary impact was observed in the ping-slash24 signal, which measures ICMP reachability across the country’s IPv4 /24 network prefixes. The signal recorded a severity score of 8,874, with reachability dropping by 99% from its peak during the event. Other network telemetry signals, including the Border Gateway Protocol (BGP) control plane, showed no significant deviation, indicating the disruption was likely confined to the data plane. The cause has not been publicly attributed.

Connectivity was reported restored by the end of the observation period.