Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm using the below open DNS name servers which I got from a friend. Are they trustable?

4.2.2.1, 4.2.2.2, 4.2.2.3, 4.2.2.4, 4.2.2.5, 4.2.2.6
share|improve this question
up vote 6 down vote accepted

Those are open DNS servers - i.e. they're on the public internet. They belong to Level 3 so are probably safe to use.

OpenDNS (note no space) is another DNS provider which has different addresses for it's public servers, which are in harrymc's post.

share|improve this answer

According to opendns.com:

OpenDNS nameserver IP addresses are:

208.67.220.220
208.67.222.222

Some routers and devices need a third or fourth nameserver IP address. Use these if necessary (identical service to the original two):

208.67.220.222
208.67.222.220

share|improve this answer

They have nothing to do with OpenDNS (see Dave Webb's post) and, since they are open recursive name servers, they should not be trusted:

  • risk of being shut down at every moment, because they can be used for amplification attacks (see RFC 5358)
  • much higher risk of poisoning through the Kaminsky weakness (since a prerequisite of the Kaminsky attack is the ability to use the name server).
share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .