FINDING · EVALUATION

Using open HTTP proxies distributed across 27 Iranian ASNs, the study confirmed 89% (24/27) of tested networks could reach the private filtering page (10.10.34.34) and 77% (21/27) could reach Imam Reza University's private IP. Of 15 proxies on RFC1918 addresses themselves, 13 (87%) could also reach the filtering page, confirming nationwide — not localized — private-space reachability.

From 2012-anderson-hidden — The Hidden Internet of Iran: Private Address Allocations on a National Network · §4.1 · 2012

Implications

The near-universal reachability of the private filtering infrastructure across disparate ASNs confirms Iran's censor operates a highly available, centrally administered system — circumvention tools should not design around exploiting censor infrastructure outages as a bypass strategy.
Proxy-based reachability testing from inside Iran is a viable low-cost measurement methodology for mapping national intranet coverage without requiring dedicated vantage points.