Autonomous systems and networks - DNS analysis CZ 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 | % |
| 24971 | MASTER-AS | 164646 | 28.06 |
| 15685 | CASABLANCA-AS | 106786 | 18.20 |
| 24806 | INTERNET-CZ | 96639 | 16.47 |
| 31034 | ARUBA-ASN | 91762 | 15.64 |
| 25234 | GLOBE-AS | 75225 | 12.82 |
| 29134 | IGNUM-AS | 62382 | 10.63 |
| 6740 | Tiscali | 50596 | 8.62 |
| 2819 | GTSCZ | 42006 | 7.16 |
| 35592 | COOLHOUSING-AS | 31447 | 5.36 |
| 34222 | ZONER-AS | 28636 | 4.88 |
| 25088 | NETHOST | 25624 | 4.37 |
| 29208 | DIALTELECOM-AS | 24440 | 4.17 |
| 39392 | SUPERNETWORK-AS | 21386 | 3.65 |
| 6706 | VOL-AS | 17608 | 3.00 |
| 39790 | WEB4U | 16962 | 2.89 |
| 29113 | SLOANE-AS | 15552 | 2.65 |
| 6721 | CZ-TERMINAL | 11374 | 1.94 |
| 5610 | TO2-CZECH-REPUBLIC | 10764 | 1.83 |
| 3386 | 9805 | 1.67 | |
| 29405 | VNET-AS | 7741 | 1.32 |
| 9080 | GIN | 5481 | 0.93 |
| 8001 | NAC | 5021 | 0.86 |
| 21435 | BROADNET-CZ | 4728 | 0.81 |
| 13727 | 4668 | 0.80 | |
| 43541 | VSHOSTING | 4395 | 0.75 |
| 25248 | BlueTone-AS | 4285 | 0.73 |
| 5407 | SKYNET-CZ | 4258 | 0.73 |
| 34302 | WSCNET | 4152 | 0.71 |
| 6830 | UPC | 3776 | 0.64 |
| 41453 | TRESTEL-CZ-ASN | 3657 | 0.62 |
| Subnets of DNS servers - per number of domains | ||
| subnet | domains | % |
| 81.2.208.0/22 | 95123 | 16.21 |
| 81.2.194.0/23 | 92133 | 15.70 |
| 62.149.224.0/19 | 91756 | 15.64 |
| 81.31.37.0/24 | 77870 | 13.27 |
| 81.95.96.0/22 | 75201 | 12.82 |
| 217.31.48.0/21 | 49805 | 8.49 |
| 213.235.132.0/22 | 49015 | 8.35 |
| 217.198.113.0/25 | 28636 | 4.88 |
| 77.93.209.224/27 | 26414 | 4.50 |
| 81.0.235.0/24 | 24479 | 4.17 |
| 81.31.32.0/22 | 16000 | 2.73 |
| 81.91.84.0/22 | 15689 | 2.67 |
| 193.86.238.0/24 | 15649 | 2.67 |
| 195.47.67.0/24 | 10471 | 1.78 |
| 77.78.126.0/24 | 10328 | 1.76 |
| 62.109.141.128/26 | 10327 | 1.76 |
| 88.146.119.0/24 | 10244 | 1.75 |
| 82.208.47.0/27 | 10175 | 1.73 |
| 206.225.0.0/19 | 9805 | 1.67 |
| 89.185.253.0/24 | 8063 | 1.37 |
| 88.208.118.0/23 | 7945 | 1.35 |
| 87.236.192.0/22 | 7816 | 1.33 |
| 88.86.120.0/24 | 7085 | 1.21 |
| 217.73.16.0/21 | 7043 | 1.20 |
| 77.78.110.128/26 | 6899 | 1.18 |
| 87.236.196.0/22 | 6822 | 1.16 |
| 77.93.211.192/26 | 6605 | 1.13 |
| 77.93.208.0/24 | 5657 | 0.96 |
| 62.168.63.0/24 | 5541 | 0.94 |
| 81.0.237.224/29 | 5198 | 0.89 |
| 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 | 436987 | 74.48 |
| all name servers are located in the same AS | 132364 | 22.56 |
| name servers in different subnets | ||
| result | number | % |
| DNS servers are at least in 2 different subnets | 509622 | 86.86 |
| all name servers are in the same subnet | 59729 | 10.18 |
| different IPv4 addresses of name servers | ||
| result | number | % |
| DNS servers have different IP addresses | 562856 | 95.94 |
| some name servers have the same IP | 6495 | 1.11 |
(c) Petr Šťastný 2010, e-mail: 