The 2021 National Internet Segment Reliability Research

The Methodology of Internet Reliability Measurement

  • For every AS in the world, we examine all alternate paths to Tier-1 operators with the help of an AS relationship model, the core of Qrator.Radar;
  • Using the Maxmind GeoIP database, we matched countries to every IP address of every AS;
  • For every AS, we calculated the share of its address space that corresponds to the relevant region. ISP’s were filtered out that reside at an Internet Exchange Point in a region where they do not have a significant presence. The example we are using here is Hong Kong, where traffic is exchanged among hundreds of members of HKIX — yet the biggest Asian Internet Exchange, most of which have zero presence in the local internet segment;
  • After isolating regional ASs, we analyzed the potential impact of one’s outage on other AS’s as well as their respective countries;
  • In the end, for each country, we identified the AS with the greatest/largest impact on other ASes in their region. Foreign AS’s were not considered.
  • We took that AS’s impact value as a reliability score for the country. And used that score to rate the reliability of countries. The less score­ is — the better reliability is.

IPv4 Reliability

  • Three segments left the top-20 of reliability rating: Lichtenstein, Belgium and Hong Kong;
  • The USA fell by 9 positions;
  • Singapore gained 6 positions;
  • Thailand and Taiwan entered the top-20 for the first time;
  • Luxembourg reappeared in the top-20 after falling out of it in 2020.

IPv6 Reliability

Broadband Internet and PTR records

ISPs With Only One Upstream (Stub networks) and Their Reliability



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