Question with DNS Query

Hi,

What do A.GTLD-SERVERS.net, B.GTLD-SERVERS.net, ..., I.GTLD-SERVERS.net mean in DNS query? Thanks.
yeshenglAsked:
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sowynConnect With a Mentor Commented:
Ok, I think you have to change the DNS server: you should set it to the nameserver which hosts the domain you are querying.

For example, if I query the domain libero.it in the server a.gtld-servers.net I get:

(root)  nameserver = g.root-servers.net
(root)  nameserver = f.root-servers.net
(root)  nameserver = a.root-servers.net
[...]

and their reverse:

g.root-servers.net      internet address = 192.112.36.4
f.root-servers.net      internet address = 192.5.5.241
a.root-servers.net      internet address = 198.41.0.4

But if I change the DNS server and try to set the server which maintainces that domain (195.210.91.100), it gives me the full information about it:

libero.it
        primary name server = ns1.libero.it
        responsible mail addr = hostmaster.iol.it
        serial  = 2004091500
        refresh = 86400 (1 day)
        retry   = 1800 (30 mins)
        expire  = 604800 (7 days)
        default TTL = 86400 (1 day)
[...]

and so on...
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rsripracCommented:
These are the actual DNS servers, where A.GTLD-SERVERS.net is the first, and B.GTLD-SERVERS.net is the second backup server, etc...  There are backups so that when one goes down, your whole domain does not go down because it could be resolved in another backup sever.
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sowynCommented:

Those are the "Global Top Level Domain" Servers (GTLD..)...
I can't give you more information because I don't know the query you made to get that...

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yeshenglAuthor Commented:
Thanks. I am trying to query DNS with socket programming. Do you know how to do that?
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yeshenglAuthor Commented:
Thanks!
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