type command 'dig google.com' in cmd, can result following picture.
google.com. 300 in 74.125.235.104 google.com. 300 in 74.125.235.110 google.com. 300 in 74.125.235.98 google.com. 300 in 74.125.235.99 google.com. 300 in 74.125.235.103 google.com. 300 in 74.125.235.96 google.com. 300 in 74.125.235.100 google.com. 300 in 74.125.235.101 google.com. 300 in 74.125.235.102 google.com. 300 in 74.125.235.97 google.com. 300 in 74.125.235.105 type reverse command 'dig '74.125.235.104'(first ip address of results) can result following picture.
104.235.125.74.in-addr.arpa. 9174 in ptr nrt19s02-in-f8.1e100.net. and reverse command 'dig '74.125.235.103' (not in results near results), can result following.
103.235.125.74.in-addr.arpa. 19820 in ptr nrt19s02-in-f7.1e100.net. 'nrt19s02-in-f8.1e100.net' 1 of domain name google has. looks encrypted message.
it may there rules, can't find them except increasing , decreasing number.
what nrt or kix mean?
if enter 'nrt19s02-in-f8.1e100.net' in internet explorer, can reach google main page. supposed redirecting.
those thought , questions following.
1. rule or meaning of thoes domain name(kix, nrt....etc.)
2. purpose or advantage of operating domains above. yahoo or facebook manages that.
3. know method collecting ip addresses of 'google.com'?
p.s did experiment using nslookup , captured results, couldn't upload image file becuase reputation low. did same experiments using dig command. dns server 8.8.8.8(google public dns)
any ideas have welcome!
i have @ myself today. first code (left 3 letters) appears geographic location information. kix , nrt both iata airport codes in japan. have major data centres, possible google colo. in australia, example, starting syd. there colo in sydney used google. seems other companies use iata codes. seems useful since datacentres in major population centres have airports iata codes.
is, supposedly, google (or whoever) can direct local server improve performance , potentially save money (since internal crossconnects in data centres can used connect direct isp). allows customisation based on geoip, , possibly makes tracking , ad targeting easier google. exact records returned depend on dns server queried rather on own ip, seems. looks possible query dns server in country , different result.
i believe google's ip address spaces are: 64.233.160.0 - 64.233.191.255 66.102.0.0 - 66.102.15.255 66.249.64.0 - 66.249.95.255 72.14.192.0 - 72.14.255.255 74.125.0.0 - 74.125.255.255 209.85.128.0 - 209.85.255.255 216.239.32.0 - 216.239.63.255 don't know used google.com. know here getting 74.125.237.x addresses google.com, , 74.125.31.x www.google.com, , 74.125.237.x mail.google.com. suspect there overlap, , single ips used multiple google 'services'. also, google public dns of 8.8.8.8 different servers depending on location, results vary depending on in world are.
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