Linked Questions

70 votes
7 answers
121k views

DNS A vs NS record

I'm trying to understand DNS a bit better, but I still don't get A and NS records completely. As far as I understood, the A record tells which IP-address belongs to a (sub) domain, so far it was ...
Tiddo's user avatar
  • 1,029
205 votes
5 answers
154k views

What is a glue record?

This is a Canonical Question about DNS glue records. What exactly (but briefly) is a DNS glue record? Why are they needed and how do they work?
LanceBaynes's user avatar
  • 3,127
34 votes
3 answers
23k views

Is dig +trace always accurate?

When the accuracy of a DNS cache is in question, dig +trace tends to be the recommended way of determining the authoritative answer for an internet facing DNS record. This seems to be particularly ...
Andrew B's user avatar
  • 33.1k
9 votes
3 answers
10k views

What is the correct behaviour when Nameservers Change

I have been having some issues with a certain network supplier over unchanged nameservers making my site invisible to their customers. I wouldnt be bothered except that they are one of the largest ...
Toby Allen's user avatar
7 votes
3 answers
8k views

Is there any way to tell the TTL on root name server DNS records?

I am currently migrating a DNS zone from one DNS server provider to another. I am trying to estimate how long it will take for the change to propagate, and to understand what the delay might be if I ...
Garreth McDaid's user avatar
3 votes
3 answers
3k views

Why do name servers occur in whois as well as DNS?

I am trying to understand why the name servers for a domain occurs in both whois information and DNS information. For example, the following whois output shows that ns1.google.com, ns2.google.com, ...
Lone Learner's user avatar
25 votes
2 answers
11k views

Some DNS servers in the world giving wrong IP address for our domain?

Our domain, grahamhancock.com is being wrongly resolved by a few people around the world, but it resolves correctly for most people. When I run through a list of free open DNS providers, about 90% ...
Duncan Marshall's user avatar
9 votes
2 answers
4k views

DNS subdomain (child) NS records

If we have example.com we would setup things something like this: $ORIGIN example.com. @ 1D IN SOA ns1.example.com. hostmaster.example.com. ( 2002022401 ; serial ...
urlator's user avatar
  • 115
1 vote
2 answers
453 views

Under which circumstances will the NS records at the apex of a zone be queried?

At what point do the NS records defined at the apex of a zone are queried during normal operations? From what I've researched these records are used by: DNS NOTIFY, for the master to signal slave ...
German's user avatar
  • 13
1 vote
2 answers
582 views

How to delegate NS for the apex?

We have a registered domain (example2.com) that has the company's name servers registered against it (ns1.example.com, ns2.example.com) at the registrar. We would like to "delegate" the DNS ...
Patrick's user avatar
  • 123
6 votes
1 answer
2k views

Why does dig +trace seem to ignore the DNS glue records?

Here are my questions: Why does dig +trace ignore the Glue Records? Is this behavior specific to dig or dig +trace, or does a recursive name server also "manually verify" glue records it receives? ...
Eddie's user avatar
  • 193
1 vote
1 answer
716 views

When are NS records at the apex of a DNS domain queried?

Let's say, that I have a following example.com zone: $TTL 120 @ IN SOA ns1 hostmaster (2018041509 300 ...
Martin's user avatar
  • 372
1 vote
1 answer
1k views

Correctly calculate DNS TTL from host -a output

I'm trying to figure out how TTLs are handled in DNS (in the end I'm trying to figure out the fastest way to switch over a domain), but somehow I'm stuck in interpreting TTL values. For example I ...
s1lv3r's user avatar
  • 1,155
0 votes
1 answer
624 views

Nameservers chaining

I pointed my domain nameservers (in the regristrar) to a DNS provider (Cloudflare). Then I created two NS records pointing to my hoster nameserver. Registrar -> DNS provider -> hoster. But it doesn't ...
John Doe's user avatar
  • 111
-3 votes
1 answer
466 views

How to configure Separate Domain registrar, Web host and Email host settings? [duplicate]

Let's say we have a domain example.com Domain registrar : NAME.COM Web Host : IPAGE.COM Email Host : GMAIL (Google Apps) My understanding is that: I should add MX records to use Gmail (clear) I ...
Bubba Yakoza's user avatar
-3 votes
1 answer
2k views

DNS lookup takes 10 plus seconds [closed]

DNS lookup of www.duckdns.org takes 10 plus seconds. Is this my internet provider's DNS issue? Here is the output of host command using my provider DNS and Google DNS: $ time host www.duckdns.org ...
mehturt's user avatar
  • 91
7 votes
0 answers
3k views

Registrar nameservers vs. NS records for bare domain?

OK, I'm a bit new to DNS, but I'm having some trouble finding the answer to this. I have a domain registered at google domains. As with other registrars, you have access to their free DNS, and ...
kegepet's user avatar
  • 71
2 votes
0 answers
57 views

Role of Authoritative NS record in bind9 compared with Non-Authoritative NS record in Registrar [duplicate]

Whenever we register a new domain name from a Registrar, we need to tell them what is the nameserver by providing them the dns server IP address. But in the same time in the zone file of our dns ...
sylye's user avatar
  • 240
1 vote
0 answers
43 views

How works the NS record definition in DNS section at CloudFlare? [duplicate]

In domain configuration at CloudFlare, the DNS section stores the record definitions. What is the exact purpose of NS record here? If configured, it shows something like: Type | Name | Value ...
Krzysztof Śląski's user avatar