Why does DNS resolve www.google.com and google.com returned different result?

Question

I don't know how to ask this question appropriately.Maybe it is a duplicate one, if so, please let me know. When I use dig to resolve www.google.com and google.com, it gives me different answer.Why? Please refer me to articles relative to this.Thanks:-)

first: this is very off-topic for SO. second: because `www.google.com` is a different domain name than `google.com` — Franz Gleichmann, Oct 18 '16 at 08:33

score 1 · Accepted Answer · answered Oct 18 '16 at 07:17

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www.google.com and google.com are separate DNS entries and can point to two different servers. For most sites one is just a CNAME of the other, meaning that they both end up pointing to the same server, but this is not a requirement.

Historically NASA has been reluctant to support nasa.gov for www at all, and this blog post makes an interesting read.

answered Oct 18 '16 at 07:17

Coolsnack

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Thanks for your reply:-) – CharlesLiuChina Oct 18 '16 at 07:47

Why does DNS resolve www.google.com and google.com returned different result?

1 Answers1