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I am building DNS service and I need to find out location of DNS servers querying me. Apparently anyone who is using Google public DNS like 8.8.8.8 is coming from Google /17 network, and if I do geoip lookup, it resolves to US, but the server is in Ireland.

Do I really need to run traceroute for IP each to find out how far it is?

Also, bgp reports that it's /23 subnet however I have no idea how to get this information up to date either. http://bgp.he.net/ip/209.85.143.94

[root@test ~]# host 209.85.143.94
94.143.85.209.in-addr.arpa domain name pointer dy-in-f94.1e100.net.
[root@test ~]# geoiplookup 209.85.143.94
GeoIP Country Edition: US, United States
[root@test ~]# traceroute 209.85.143.94
traceroute to 209.85.143.94 (209.85.143.94), 30 hops max, 60 byte packets
 1  31.222.167.2 (31.222.167.2)  1.344 ms  2.273 ms  2.135 ms
 2  core6a-aggr325a-4.lon3.rackspace.net (92.52.77.106)  3.386 ms  3.326 ms  3.316 ms
 3  corea-core6a.lon3.rackspace.net (164.177.137.10)  3.290 ms  3.249 ms coreb-core6a.lon3.rackspace.net (164.177.137.22)  3.222 ms
 4  edge1-coreb.lon3.rackspace.net (164.177.137.29)  3.199 ms  3.161 ms edge1-corea.lon3.rackspace.net (164.177.137.27)  3.138 ms
 5  195.50.122.41 (195.50.122.41)  3.118 ms  3.075 ms  3.047 ms
 6  195.50.122.82 (195.50.122.82)  3.021 ms  1.523 ms  1.589 ms
 7  209.85.255.78 (209.85.255.78)  2.940 ms 209.85.255.76 (209.85.255.76)  2.877 ms 209.85.255.78 (209.85.255.78)  2.873 ms
 8  209.85.253.90 (209.85.253.90)  2.844 ms  2.817 ms  2.789 ms
 9  209.85.250.216 (209.85.250.216)  18.132 ms 209.85.251.190 (209.85.251.190)  14.584 ms 209.85.250.216 (209.85.250.216)  18.049 ms
10  209.85.253.125 (209.85.253.125)  14.537 ms 209.85.253.203 (209.85.253.203)  16.017 ms 209.85.253.127 (209.85.253.127)  14.484 ms
11  216.239.43.22 (216.239.43.22)  22.787 ms  22.739 ms 216.239.47.26 (216.239.47.26)  25.445 ms
12  dy-in-f94.1e100.net (209.85.143.94)  17.312 ms  12.970 ms  15.537 ms
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1 Answer

up vote 1 down vote accepted

you can try using 3rd party database like this one. or start building your own by retrieving and parsing the whois information.

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He has tried using "geoip country edition" but it reported the wrong location (even the wrong continent) for his desired IP address. –  syneticon-dj Aug 2 '12 at 13:17
    
@syneticon-dj i'm afraid you cannot address it. i've just run a query via google dns against my own name server and inspected content of their dns request - there's nothing that would reveal actual origin of the request. you might be able to map google's ip addresses to their data-centers but i would not relay on that info. –  pQd Aug 2 '12 at 13:27
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