Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

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

In the past I was always told by colleagues appears to work faster and have to combine that with Google's public DNS*. Using as primary and as secondary. However, Google only provides and, so who provides And if true, why is faster?

*Note: These IP addresses are used to dig domains and to determine if local DNS changes has propagated over all over the internet.

share|improve this question

closed as off-topic by Ƭᴇcʜιᴇ007, Kruug, nerdwaller, Dave M, Olli Jan 31 '14 at 9:03

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question is not about computer hardware or software, within the scope defined in the help center." – Ƭᴇcʜιᴇ007, Kruug, nerdwaller, Dave M, Olli
If this question can be reworded to fit the rules in the help center, please edit the question.

nslookup = "" – Ƭᴇcʜιᴇ007 Jan 29 '14 at 18:32
Makes me wonder why and etc aren't used. – YesMan85 Jan 29 '14 at 23:52
13 is unofficially reserved (allocated to "Debogon-prefix") — it receives a ton of bogus traffic from misconfigured devices, so it's unusable in practice. – duskwuff Jan 30 '14 at 0:17
up vote 69 down vote accepted is one of six ( through DNS servers run by Level 3 Communications, a Tier 1 ISP. These are supposed to be used by Level 3 customers only, although they have gone into general use over the years. Supposedly, they are officially discouraging people from using these DNS servers, as they are under no obligation to provide this service and can theoretically discontinue them at any time (whereas Google provides their DNS servers expressly for public use).

More information here.

share|improve this answer
2 is also useful for network debugging, namely an easy to remember IP that responds to pings. For years, if there was a network connection issue, the first step would be to ping the router, then to ping, to see if packets got on the net (no DNS needed). is a bit easier to remember now though :) – Rich Homolka Jan 29 '14 at 18:35
BTW, Level 3 are now hijacking some failed requests – Sathya Jan 29 '14 at 18:47
But yet again, Google isn't under any obligation. – oldmud0 Jan 30 '14 at 1:42
Link to level 3 story, without reddit:… – Kristoffer Sall-Storgaard Jan 30 '14 at 7:42

Not the answer you're looking for? Browse other questions tagged or ask your own question.