Difference between revisions of "DNS"
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== DNS Servers Open to Public Query == | == DNS Servers Open to Public Query == | ||
{| | This is '''not''' an exhaustive list of publicly accessible DNS servers. There are more, those listed below are a subset, and may be better or worse than others. | ||
|- | |||
{|class="vwikitable" | |||
|- | |||
! IP Address !! Provider !! Location | ! IP Address !! Provider !! Location | ||
|- | |- | ||
| 8.8.8.8 || Google | | 8.8.8.8 || [https://developers.google.com/speed/public-dns/ Google] || Global (routed via [http://en.wikipedia.org/wiki/Anycast Anycast]) | ||
|- | |- | ||
| 8.8.4.4 || Google | | 8.8.4.4 || [https://developers.google.com/speed/public-dns/ Google] || Global (routed via [http://en.wikipedia.org/wiki/Anycast Anycast]) | ||
|- | |- | ||
| 156.154.70.1 || DNSadvantage | | 156.154.70.1 || [http://www.dnsadvantage.com/index.html DNSadvantage] || [Global http://www.dnsadvantage.com/dnsadv/node_locations.html] | ||
|- | |- | ||
| 156.154.71.1 || DNSadvantage | | 156.154.71.1 || [http://www.dnsadvantage.com/index.html DNSadvantage] || [Global http://www.dnsadvantage.com/dnsadv/node_locations.html] | ||
|- | |- | ||
| 208.67.220.220 || OpenDNS || Global, mainly US (routed via [http://en.wikipedia.org/wiki/Anycast Anycast]) | | 208.67.220.220 || [http://www.opendns.com/ OpenDNS] || [Global, mainly US http://www.opendns.com/technology/network-map/] (routed via [http://en.wikipedia.org/wiki/Anycast Anycast]) | ||
|- | |- | ||
| 208.67.220.222 || OpenDNS || Global, mainly US (routed via [http://en.wikipedia.org/wiki/Anycast Anycast]) | | 208.67.220.222 || [http://www.opendns.com/ OpenDNS] || [Global, mainly US http://www.opendns.com/technology/network-map/] (routed via [http://en.wikipedia.org/wiki/Anycast Anycast]) | ||
|- | |- | ||
| 4.2.2.1 || | | 4.2.2.1 || Level 3 || Probably global (routed via [http://en.wikipedia.org/wiki/Anycast Anycast]) | ||
|- | |- | ||
| 4.2.2.2 | | 4.2.2.2 <ref name="4.2.2.2" /> || Level 3 || Probably global (routed via [http://en.wikipedia.org/wiki/Anycast Anycast]) | ||
|- | |- | ||
| 194.72.9.34 || [http://www.bt.com/ BT] || UK | | 194.72.9.34 || [http://www.bt.com/ BT] || UK | ||
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NSLookup is a Name Server Lookup/Query tool which exists in both Unix and Windows distributions, and generally speaking, functionaly the same regardless of which version you're using. To start, run <code>nslookup</code> from the command line. | NSLookup is a Name Server Lookup/Query tool which exists in both Unix and Windows distributions, and generally speaking, functionaly the same regardless of which version you're using. To start, run <code>nslookup</code> from the command line. | ||
{| | {|class="vwikitable" | ||
|- | |- | ||
! Command !! Description | ! Command !! Description | ||
|- | |- | ||
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microsoft.com MX preference = 10, mail exchanger = mail.messaging.microsoft.com | microsoft.com MX preference = 10, mail exchanger = mail.messaging.microsoft.com | ||
> | > | ||
== Notes == | |||
<references> | |||
<ref name="4.2.2.2">For further info on 4.2.2.2 see http://www.tummy.com/Community/Articles/famous-dns-server/</ref> | |||
</references> | |||
[[Category:Networking]] | |||
Revision as of 13:03, 9 May 2012
DNS Servers Open to Public Query
This is not an exhaustive list of publicly accessible DNS servers. There are more, those listed below are a subset, and may be better or worse than others.
| IP Address | Provider | Location |
|---|---|---|
| 8.8.8.8 | Global (routed via Anycast) | |
| 8.8.4.4 | Global (routed via Anycast) | |
| 156.154.70.1 | DNSadvantage | [Global http://www.dnsadvantage.com/dnsadv/node_locations.html] |
| 156.154.71.1 | DNSadvantage | [Global http://www.dnsadvantage.com/dnsadv/node_locations.html] |
| 208.67.220.220 | OpenDNS | [Global, mainly US http://www.opendns.com/technology/network-map/] (routed via Anycast) |
| 208.67.220.222 | OpenDNS | [Global, mainly US http://www.opendns.com/technology/network-map/] (routed via Anycast) |
| 4.2.2.1 | Level 3 | Probably global (routed via Anycast) |
| 4.2.2.2 [1] | Level 3 | Probably global (routed via Anycast) |
| 194.72.9.34 | BT | UK |
| 194.72.9.34 | BT | UK |
Sources: http://theos.in/windows-xp/free-fast-public-dns-server-list/
NSLookup
NSLookup is a Name Server Lookup/Query tool which exists in both Unix and Windows distributions, and generally speaking, functionaly the same regardless of which version you're using. To start, run nslookup from the command line.
| Command | Description |
|---|---|
server |
Displays the DNS server(s) currently being used by nslookup |
server 8.8.4.4 |
Changes the DNS server being used/queried to 8.8.4.4 |
host.domain.com |
Attempts to resolve host.domain.com against current DNS server
|
109.123.76.85 |
Attempts a reverse lookup for IP 109.123.76.85 against current DNS server
|
set q=mx |
Set query type to MX (subsequent queries will look for Message Exchange (email) records)
|
set q=all |
Set query type back to all records |
exit |
Quit nslookup |
For example, to find the email exchange servers for a particular domain...
> set q=mx > microsoft.com Server: [8.8.4.4] Address: 8.8.4.4 Non-authoritative answer: microsoft.com MX preference = 10, mail exchanger = mail.messaging.microsoft.com >
Notes
- ↑ For further info on 4.2.2.2 see http://www.tummy.com/Community/Articles/famous-dns-server/