Solved

Question with DNS Query

Posted on 2004-09-24
5
188 Views
Last Modified: 2010-04-17
Hi,

What do A.GTLD-SERVERS.net, B.GTLD-SERVERS.net, ..., I.GTLD-SERVERS.net mean in DNS query? Thanks.
0
Comment
Question by:yeshengl
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
5 Comments
 
LVL 5

Expert Comment

by:rsriprac
ID: 12147921
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.
0
 
LVL 1

Expert Comment

by:sowyn
ID: 12154420

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...

0
 

Author Comment

by:yeshengl
ID: 12156566
Thanks. I am trying to query DNS with socket programming. Do you know how to do that?
0
 
LVL 1

Accepted Solution

by:
sowyn earned 50 total points
ID: 12157951
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...
0
 

Author Comment

by:yeshengl
ID: 12223576
Thanks!
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This article will show, step by step, how to integrate R code into a R Sweave document
In this post we will learn different types of Android Layout and some basics of an Android App.
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…

730 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question