SYSTEM Cited by 1 source
Asiatech (AS43754)¶
Asiatech is an Iranian Internet service provider operating as Autonomous System 43754 (AS43754). Prior to January 2026, it was one of the two largest IPv6-announcing ASes in Iran (alongside RASANA (AS31549)) in terms of announced address space.
Asiatech is the single largest contributor to Iran's IPv6 address-space collapse on January 8, 2026, losing 4.46 million /48-equivalents — approximately 9.4% of Iran's entire IPv6 space on its own — in the hours preceding the nationwide Internet shutdown. It is the canonical wiki instance of a large Iranian AS playing the leading-indicator role in the IPv6 withdrawal as shutdown leading indicator pattern.
The 2026-01-08 IPv6 withdrawal event¶
Several hours before the January 8 Iran shutdown's traffic drop, Asiatech's announced IPv6 address space collapsed in the global BGP routing table:
- 4.46 million /48-equivalents withdrawn from global BGP (~9.4% of Iran's total IPv6 space).
- Contemporaneously with RASANA (AS31549)'s 4.19 million /48-equivalent withdrawal (~8.8% of Iran's total).
- IPv4 announcements stayed nominally consistent through the same window — the withdrawal was IPv6-specific.
Cloudflare Radar's interpretation: "Given the gap in timing between this change and the loss of traffic across the country, this may have been a leading indicator of what was about to happen, but likely not a direct cause of it."
Within hours, the January 8 national Internet shutdown followed — implemented via traffic filtering rather than continued route withdrawal (IPv4 announcements remained stable). The coordinated IPv6 retraction across Iran's largest IPv6-announcing ASes remains consistent with a state-coordinated operational rehearsal or staged de-advertisement before the main filtering-based shutdown kicked in.
External accessibility¶
Per-AS routing detail for Asiatech can be viewed on Cloudflare Radar at radar.cloudflare.com/as43754. The per-AS view aggregates BGP history, upstream / peer / downstream relationships, and prefix-level withdrawal events.
Role in shutdown observability¶
Asiatech matters for shutdown observability because its IPv6-space share is large enough that a significant withdrawal alone materially shifts the national IPv6 posture of Iran. An observer monitoring only country-aggregate IPv6 space — not per-AS detail — would still detect the withdrawal event but would miss the attribution (which ASes are the vehicle?). The per-AS breakdown provides the political attribution: Asiatech's withdrawal was part of the shutdown mechanism's staging, not a coincidental peering event.
Seen in¶
- sources/2026-04-28-cloudflare-q1-2026-internet-disruption-summary — canonical wiki instance. Asiatech (AS43754) was the single largest contributor to Iran's IPv6 address-space collapse preceding the January 8 2026 nationwide Internet shutdown, losing 4.46 million /48-equivalents (~9.4% of Iran's IPv6 space on its own) hours before the traffic drop across the country.