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.

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    nslookup = "b.resolvers.level3.net" – Ƭᴇcʜιᴇ007 Jan 29 '14 at 18:32
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    Makes me wonder why and etc aren't used. – Roger Far Jan 29 '14 at 23:52
  • 15 is unofficially reserved (allocated to "Debogon-prefix") — it receives a ton of bogus traffic from misconfigured devices, so it's unusable in practice. – duskwuff -inactive- Jan 30 '14 at 0:17
  • Microsoft uses internetbeacon.msedge.net => for its Powershell module Test-NetConnection. – CMCDragonkai Feb 2 '17 at 15:21
  • @duskwuff-inactive- Surprise ;) – VarunAgw Apr 6 at 23:54
79 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.

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  • 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
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    BTW, Level 3 are now hijacking some failed requests – Sathyajith Bhat Jan 29 '14 at 18:47
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    But yet again, Google isn't under any obligation. – oldmud0 Jan 30 '14 at 1:42
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    Link to level 3 story, without reddit: james.bertelson.me/blog/2014/01/… – Kristoffer Sall-Storgaard Jan 30 '14 at 7:42
  • @KristofferSall-Storgaard, link doesn't work. – Cœur Jul 28 '16 at 3:17

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