TSUBAME Report Overflow (Jan-Mar 2026)

The TSUBAME quarterly monitoring report (Jan–Mar 2026, FY2025) details widespread scanning observed by sensors in Japan and overseas, noting a decline in Mirai-like Telnet (23/TCP) traffic from ~70% to ~30% over the fiscal year and a rise in scans from other compromised IoT devices (surveillance cameras, DVRs, NAS, routers); it provides port- and sensor-level comparisons, highlights commonly targeted ports (23, 443, 22, 80, 8728, etc.), and advises device hardening, firmware updates, and monitoring to reduce exposure.