CODEWITHSUNDEEP
javadns
Sander Smith
Sander Smith

Reputation: 1437

Getting the address of a DNS server programmatically in Java

Is it possible to programmatically get the address of the DNS server that's going to be used when I do my hostname resolution? I'd like to do this in a platform independent way in Java. I know there is some way to do it in Linux, some Windows APIs, etc., but can I get to this stuff from Java?

Upvotes: 11

Views: 10076

Answers (3)

CamelTM
CamelTM

Reputation: 1250

JDK 8 example:

...
import sun.net.dns.ResolverConfiguration;
...
List nameServers = ResolverConfiguration.open().nameservers();
nameServers.forEach((dns)->System.out.println(dns));
...

Upvotes: 0

Andre Holzner
Andre Holzner

Reputation: 18675

You can use dnsjava:

import org.xbill.DNS.*;

String dnsServers[] = ResolverConfig.getCurrentConfig().servers();

(however you can't know which of the potentially multiple servers will be used for a given lookup)

Upvotes: 2

Roberto Andrade
Roberto Andrade

Reputation: 1853

Depending on what vendor VM you're using, you can do it by using either JNDI or a vendor-specific API (Sun/Oracle's in this case). Check this post which describes both.

I'm currently looking for a way to do the same on OpenJDK and will post details if I find anything.

EDIT: Looks like those classes are also available on the OpenJDK, interesting...

Upvotes: 1

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