Iran: Internet shutdown from 7 UTC 28 February 2026

During Iran's near-complete February 2026 shutdown, DNS-based tunneling (dnstt over UDP port 53) was identified by the community as the only functioning circumvention method, with participants successfully sharing public dnstt server configurations to maintain connectivity.

Issue body / community comments defense bgp-hijackip-blocking ir

Iran experienced a near-complete internet shutdown on February 28, 2026 beginning at approximately 07:00 UTC, with Cloudflare Radar measuring ~98% connectivity loss relative to the previous week, affecting Tehran, Fars, Isfahan, Alborz Province, and Razavi Khorasan simultaneously.

Issue body evaluation bgp-hijackip-blocking ir

IODA data confirmed the February 28, 2026 Iran shutdown was implemented via BGP route withdrawals and collapse of IP-space announcements, not merely application-layer blocking — the underlying routing infrastructure itself was withdrawn.

Issue body (IODA reference) deployment bgp-hijackasn-blackholing ir

Community experimentation during the February 2026 Iran shutdown revealed heterogeneity across ISPs in what survived: participants tested different DNS resolvers and ISPs to find working dnstt paths, indicating the BGP withdrawal was not perfectly uniform across all Iranian autonomous systems.

Issue comments evaluation bgp-hijackip-blocking ir