Archit Tantia

Most of us Geeks do a lot of tests to find out which DNS Resolution Service is best for our homes or workplaces. Well after doing some tests I figured out that OpenDNS is the best for me as it resolves addresses faster that any other DNS Resolution Services, including Google’s Public DNS.

While deciding the DNS Resolution Service, I wanted to find out which service had their servers closest to my location. OpenDNS has a nice System Status page which shows the server list along with their uptime status. For every service provider it was easy for me to find out their server locations, except Google’s Public DNS. I was surprised at how they went ahead and put the Server Locations list. Now it’s very easy to do a simple Google search and find out what those IATA Airport codes stand for, most of which you could even guess if you had some geographic sense, but why make it so complicated? They could have instead, made it easy for everybody by creating a simple listing with the respectful city/country names in full.

Till they do that, I complied a simpler table of the subnets from which Google Public DNS sends requests to authoritative nameservers:

Subnet	Airport Code	Location
64.233.162.0/24	GRU	Sao Paulo, Brazil
74.125.16.0/24	TPE	Taipei, Taiwan
74.125.17.0/24	BRU	Brussels, Belgium
74.125.18.16/29	BER	Berlin, Germany
74.125.18.80/29	LPP	Lappeenranta, Finland
74.125.18.144/29	GRQ	Groningen, Netherlands
74.125.18.208/29	GRQ	Groningen, Netherlands
74.125.19.0/24	MRN	Morganton, North Carolina, USA
74.125.176.0/24	MRN	Morganton, North Carolina, USA
74.125.178.0/24	ATL	Atlanta, GA, USA
74.125.179.0/24	ATL	Atlanta, GA, USA
74.125.181.0/24	BRU	Brussels, Belgium
74.125.182.0/24	CBF	Council Bluffs, Iowa, USA
74.125.183.0/24	CBF	Council Bluffs, Iowa, USA
74.125.184.0/24	CHS	Charleston, SC, USA
74.125.185.0/24	CHS	Charleston, SC, USA
74.125.186.0/24	DLS	The Dalles, Oregon, USA
74.125.187.0/24	DLS	The Dalles, Oregon, USA
74.125.188.0/24	DUB	Dublin, Ireland
74.125.189.0/24	FRA	Frankfurt, Germany
74.125.191.0/24	HKG	Hong Kong
173.194.97.0/24	KUL	Kuala Lumpur, Malaysia
173.194.98.0/24	LPP	Lappeenranta, Finland
173.194.99.0/24	TUL	Tulsa, OK, USA
209.85.224.0/24	CBF	Council Bluffs, Iowa, USA
2404:6800:4001::/48	KUL	Kuala Lumpur, Malaysia
2404:6800:4005::/48	HKG	Hong Kong
2404:6800:4008::/48	TPE	Taipei, Taiwan
2607:f8b0:4001::/48	CBF	Council Bluffs, Iowa, USA
2607:f8b0:4002::/48	ATL	Atlanta, GA, USA
2607:f8b0:4003::/48	TUL	Tulsa, OK, USA
2607:f8b0:400c::/48	CHS	Charleston, SC, USA
2607:f8b0:400d::/48	MRN	Morganton, North Carolina, USA
2607:f8b0:400e::/48	DLS	The Dalles, Oregon, USA
2800:3f0:4001::/48	GRU	Sao Paulo, Brazil
2a00:1450:4001::/48	FRA	Frankfurt, Germany
2a00:1450:4008::/48	BER	Berlin, Germany
2a00:1450:400b::/48	DUB	Dublin, Ireland
2a00:1450:400c::/48	BRU	Brussels, Belgium
2a00:1450:4010::/48	LPP	Lappeenranta, Finland
2a00:1450:4013::/48	GRQ	Groningen, Netherlands

UPDATE: According to this post by Google, they added new subnets in Australia, India, Japan and Nigeria recently but are yet to update us with the subnet details. I will update this table as soon as I get the new info.