When I change my domain's (a dot com) nameservers it can take up to 2 days. I know that that's usual, but WHY is that? Just curious because my webhosting went down and I have to wait now bec...

Lets say that I purchased a new domain (somedomain.com) from a domain registar and I wanted to setup my own nameserver on a server that has two IP addresses. First I buy the domain. I get the ser...

I want to find out all the subdomains of a given domain. I found a hint which tells me to dig the authoritative nameserver with the following option: dig @ns1.foo.example example.com axfr Bu...

Is it possible to lookup the A (ip address) and NS (nameservers) of a domain using a single dig command? I can use dig google.com A +short or dig google.com NS +short but surely it's possible to d...

How can I look up a hostname given an IP address? Furthermore, how can I specify a timeout in case no such reverse DNS entry exists? Trying to keep things as fast as possible. Or is there a better ...

I've noticed that several service providers are operating DNS services for their clients' domains with NS names set for the zone and returned by the authoritative name server (in authority section ...