Summary and interesting results - DNS analysis SK 2009/09

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Summary and interesting results
item number %
Total number of domains to test 186611
Total number of domains tested 186311 99.84
Number of domain that could not be tested (no information about domain) 300 0.16
Number of unique DNS servers per name 11901
Number of unique DNS servers per IP address 8516
Average number of domain on DNS servers (by IP address of DNS server) 22
Number of DNS servery with IPv6 137 1.15
Number of domains with DNS servers with IPv6 1396 0.75
Number of DNS servers (by name) with mismatch glue 111 0.93
Number of autonomous systems 1358
Number of subnets 4650
Sum of NS records on parent servers 464757
Sum of NS records in domain zones 436103
Sum of MX records 344226
Sum of A records without www 145710
Sum of A records with www 166482
Sum of AAAA records without www 9872
Sum of AAAA records with www 9878
Sum of SRV SIP records 177
Number of all errors 122662
Number of all warnings 319356
Number of all notices 288387
Number of domains with errors 83363 44.74
Number of domains with warnings (and without errors) 71794 38.53
Number of domains with notices (and without errors and warnings) 26525 14.24
Number of domains without any problem 4929 2.65





(c) Petr Šťastný 2010, e-mail: