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Prashant Pandey avatar Server

Understanding DIG Output for electronics.stackexchange.com

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Prashant Pandey

I am trying to understand the workings of the DNS. When I do dig electronics.stackexchange.com, I get the following response (truncated at the bottom for brevity):

; <<>> DiG 9.10.6 <<>> electronics.stackexchange.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2941
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 13, ADDITIONAL: 27

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;electronics.stackexchange.com. IN  A

;; ANSWER SECTION:
electronics.stackexchange.com. 288 IN   A   151.101.129.69
electronics.stackexchange.com. 288 IN   A   151.101.193.69
electronics.stackexchange.com. 288 IN   A   151.101.65.69
electronics.stackexchange.com. 288 IN   A   151.101.1.69

;; AUTHORITY SECTION:
com.            96429   IN  NS  a.gtld-servers.net.
com.            96429   IN  NS  k.gtld-servers.net.
com.            96429   IN  NS  h.gtld-servers.net.
com.            96429   IN  NS  b.gtld-servers.net.
com.            96429   IN  NS  c.gtld-servers.net.
com.            96429   IN  NS  g.gtld-servers.net.
com.            96429   IN  NS  i.gtld-servers.net.
com.            96429   IN  NS  j.gtld-servers.net.
com.            96429   IN  NS  l.gtld-servers.net.
com.            96429   IN  NS  m.gtld-servers.net.
com.            96429   IN  NS  f.gtld-servers.net.
com.            96429   IN  NS  d.gtld-servers.net.
com.            96429   IN  NS  e.gtld-servers.net.

;; ADDITIONAL SECTION:
a.gtld-servers.net. 12796   IN  A   192.5.6.30
b.gtld-servers.net. 12796   IN  A   192.33.14.30
c.gtld-servers.net. 12796   IN  A   192.26.92.30
...

We can see that all authoritative servers for this domain are TLD .com server. I am a bit suprised that stackexchange.com does not have its own authoritative NS? So my question is, is there any specific reason why orgs might do this?

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Romeo Ninov avatar Server
in flag
Romeo Ninov

Seems like your DNS server return you odd answer. One ordinary DNS will return to you answer like this:

; <<>> DiG 9.11.5-P4 <<>> electronics.stackexchange.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61351
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 4, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;electronics.stackexchange.com. IN      A

;; ANSWER SECTION:
electronics.stackexchange.com. 87 IN    A       151.101.1.69
electronics.stackexchange.com. 87 IN    A       151.101.65.69
electronics.stackexchange.com. 87 IN    A       151.101.193.69
electronics.stackexchange.com. 87 IN    A       151.101.129.69

;; AUTHORITY SECTION:
stackexchange.com.      172587  IN      NS      ns-1832.awsdns-37.co.uk.
stackexchange.com.      172587  IN      NS      ns-925.awsdns-51.net.
stackexchange.com.      172587  IN      NS      ns-cloud-d1.googledomains.com.
stackexchange.com.      172587  IN      NS      ns-cloud-d2.googledomains.com.

where you can see the name servers of domain stackexchange.com.

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Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.