Autonomous systems and networks - DNS analysis SK 2009/09
| Number Of Autonomous Systems Per Domain | |||||||||||||||||||
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| Number Of Subnets Per Domain | |||||||||||||||||||
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| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ||||||||||
| Autonomous systems of DNS servery - per number of domains | |||
| AS number | AS name | domains | % |
| 29208 | DIALTELECOM-AS | 55426 | 29.70 |
| 42005 | LIGHTSTORM-COMMUNICATIONS-SRO-SK-AS | 29738 | 15.94 |
| 15685 | CASABLANCA-AS | 24165 | 12.95 |
| 6721 | CZ-TERMINAL | 21957 | 11.77 |
| 12508 | AS12508 | 21946 | 11.76 |
| 35419 | PRIMANET-AS | 20500 | 10.99 |
| 29405 | VNET-AS | 19507 | 10.45 |
| 24971 | MASTER-AS | 15815 | 8.47 |
| 5578 | GTS-SK-AS | 15717 | 8.42 |
| 6855 | UNSPECIFIED | 14877 | 7.97 |
| 25234 | GLOBE-AS | 7812 | 4.19 |
| 24806 | INTERNET-CZ | 7036 | 3.77 |
| 31034 | ARUBA-ASN | 5889 | 3.16 |
| 34222 | ZONER-AS | 4854 | 2.60 |
| 8778 | SLOVANET | 4728 | 2.53 |
| 25088 | NETHOST | 4277 | 2.29 |
| 12905 | ACS-SK-AS | 3295 | 1.77 |
| 29134 | IGNUM-AS | 3219 | 1.72 |
| 6803 | SWAN | 2911 | 1.56 |
| 2607 | SANET | 2837 | 1.52 |
| 6740 | Tiscali | 2550 | 1.37 |
| 39392 | SUPERNETWORK-AS | 2510 | 1.35 |
| 2819 | GTSCZ | 2491 | 1.33 |
| 24611 | DCLUX-AS | 1710 | 0.92 |
| 35592 | COOLHOUSING-AS | 1574 | 0.84 |
| 12426 | MADNET-AS | 1503 | 0.81 |
| 15598 | IP-EXCHANGE | 1439 | 0.77 |
| 15962 | OSK-DNI | 1215 | 0.65 |
| 8679 | SWAN | 1162 | 0.62 |
| 8560 | ONEANDONE-AS | 912 | 0.49 |
| Subnets of DNS servers - per number of domains | ||
| subnet | domains | % |
| 195.47.67.0/24 | 21879 | 11.72 |
| 212.89.224.0/22 | 21774 | 11.67 |
| 86.110.224.0/19 | 20500 | 10.99 |
| 82.208.46.0/24 | 18796 | 10.07 |
| 92.240.232.0/21 | 16136 | 8.65 |
| 217.67.30.0/23 | 14740 | 7.90 |
| 82.119.226.0/24 | 8680 | 4.65 |
| 195.168.0.0/16 | 8625 | 4.62 |
| 93.184.71.64/26 | 8304 | 4.45 |
| 217.73.16.0/21 | 7988 | 4.28 |
| 81.31.37.0/24 | 7835 | 4.20 |
| 81.95.96.0/22 | 7807 | 4.18 |
| 195.146.132.0/26 | 7595 | 4.07 |
| 195.146.128.0/24 | 7416 | 3.97 |
| 81.2.208.0/22 | 6673 | 3.58 |
| 217.67.18.16/28 | 6554 | 3.51 |
| 92.240.247.0/24 | 6553 | 3.51 |
| 81.2.194.0/23 | 6457 | 3.46 |
| 82.119.226.32/27 | 6263 | 3.36 |
| 62.149.224.0/19 | 5888 | 3.16 |
| 217.67.22.64/26 | 5886 | 3.15 |
| 217.198.113.0/25 | 4854 | 2.60 |
| 92.240.246.128/25 | 4823 | 2.58 |
| 77.93.209.224/27 | 4710 | 2.52 |
| 81.0.235.0/24 | 4218 | 2.26 |
| 212.5.219.0/24 | 3817 | 2.05 |
| 217.67.22.48/28 | 3518 | 1.89 |
| 81.89.56.0/24 | 3386 | 1.81 |
| 62.176.168.0/22 | 3095 | 1.66 |
| 81.89.48.0/21 | 2945 | 1.58 |
| name servers in different autonomous systems (AS) | ||
| result | number | % |
| DNS servers are at least in 2 different autonomous systems (AS) thus their availability is not dependent on one network | 121166 | 64.93 |
| all name servers are located in the same AS | 52927 | 28.36 |
| name servers in different subnets | ||
| result | number | % |
| DNS servers are at least in 2 different subnets | 144529 | 77.45 |
| all name servers are in the same subnet | 29564 | 15.84 |
| different IPv4 addresses of name servers | ||
| result | number | % |
| DNS servers have different IP addresses | 169548 | 90.86 |
| some name servers have the same IP | 4545 | 2.44 |
(c) Petr Šťastný 2010, e-mail: 