SYSTEM Cited by 1 source
RASANA (AS31549)¶
RASANA is an Iranian Internet service provider operating as Autonomous System 31549 (AS31549). Together with Asiatech (AS43754), it was one of the two largest IPv6-announcing ASes in Iran prior to the January 2026 shutdown.
RASANA is the second-largest contributor to Iran's IPv6 address-space collapse on January 8, 2026, losing 4.19 million /48-equivalents — approximately 8.8% of Iran's entire IPv6 space — in the hours preceding the nationwide Internet shutdown.
The 2026-01-08 IPv6 withdrawal event¶
Alongside Asiatech (AS43754), RASANA participated in the coordinated IPv6 retraction preceding Iran's January 8 2026 shutdown:
- 4.19 million /48-equivalents withdrawn from global BGP (~8.8% of Iran's total IPv6 space).
- Contemporaneously with Asiatech, whose IPv6 withdrawal was of similar magnitude.
- Together, ~18.2% of Iran's IPv6 space withdrew across just these two ASes in a short window.
- IPv4 announcements stayed nominally consistent through the same period.
This concentration — two ASes responsible for the majority of the IPv6 withdrawal — is consistent with a coordinated operation across Iran's largest IPv6-announcing infrastructure rather than an organic, independent decision by each AS to retract prefixes at the same moment.
Role in the shutdown mechanism¶
As with Asiatech, the RASANA IPv6 withdrawal is characterised by Cloudflare Radar as a leading indicator of the shutdown, not its mechanism:
"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."
The main shutdown that followed (January 8, 2026 onward) was implemented via aggressive filtering of IPv4 traffic — not by sustained IPv6 or IPv4 route withdrawal. The role of the IPv6 retraction events at RASANA and Asiatech is therefore one of orchestration signature, not of direct causation.
External accessibility¶
Per-AS routing detail for RASANA can be viewed on Cloudflare Radar at radar.cloudflare.com/as31549.
Seen in¶
- sources/2026-04-28-cloudflare-q1-2026-internet-disruption-summary — canonical wiki instance. RASANA (AS31549) was the second-largest contributor to Iran's IPv6 address-space collapse preceding the January 8, 2026 nationwide Internet shutdown, losing 4.19 million /48-equivalents (~8.8% of Iran's IPv6 space) hours before the traffic drop across the country.