DNS - Revision history

Sstrutt: Minor rework

2013-02-20T22:34:42Z

Minor rework

← Older revision		Revision as of 22:34, 20 February 2013
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	http://theos.in/windows-xp/free-fast-public-dns-server-list/		http://theos.in/windows-xp/free-fast-public-dns-server-list/

	== NSLookup ==		== Troubleshooting ==
			=== 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 <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.

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	>		>

	== Propagation ==		=== Propagation ===
	One of the features of DNS is the way that records get cached around the globe. Meaning that any changes to existing records have to ripple around. Generally changes take up to 72 hrs (3 days) to take effect.		One of the features of DNS is the way that records get cached around the globe. Meaning that any changes to existing records have to ripple around. Generally changes take up to 72 hrs (3 days) to take effect.

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	'''To view the propagation of a record around the world see http://www.whatsmydns.net'''		'''To view the propagation of a record around the world see http://www.whatsmydns.net'''

			=== General ===
			The following site has a number of tools that allow you to investigate how a domain is viewed externally/publicly...

			http://enc.com.au/itools/

	== Notes ==		== Notes ==

Sstrutt: Added "Propagation"

2013-02-19T21:44:00Z

Added "Propagation"

← Older revision		Revision as of 21:44, 19 February 2013
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	\|-		\|-
	\| 8.8.4.4 \|\| [https://developers.google.com/speed/public-dns/ Google] \|\| Global (routed via [http://en.wikipedia.org/wiki/Anycast Anycast])		\| 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 \|\| [http://www.dnsadvantage.com/index.html DNSadvantage] \|\| [http://www.dnsadvantage.com/dnsadv/node_locations.html Global]
	\|-		\|-
	\| 156.154.70.1 \|\| [http://www.dnsadvantage.com/index.html DNSadvantage] \|\| [~~Global~~ http://www.dnsadvantage.com/dnsadv/node_locations.html]		\| 156.154.71.1 \|\| [http://www.dnsadvantage.com/index.html DNSadvantage] \|\| [http://www.dnsadvantage.com/dnsadv/node_locations.html Global]
	\|-
	~~\| 156.154.71.1 \|\| [http://www.dnsadvantage.com/index.html DNSadvantage] \|\| [~~Global ~~http://www.dnsadvantage.com/dnsadv/node_locations.html~~]
	\|-		\|-
	\| 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])		\| 208.67.220.220 \|\| [http://www.opendns.com/ OpenDNS] \|\| [http://www.opendns.com/technology/network-map 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])		\| 208.67.220.222 \|\| [http://www.opendns.com/ OpenDNS] \|\| [http://www.opendns.com/technology/network-map Global, mainly US] (routed via [http://en.wikipedia.org/wiki/Anycast Anycast])
	\|-		\|-
	\| 4.2.2.1 \|\| Level 3 \|\| Probably global (routed via [http://en.wikipedia.org/wiki/Anycast Anycast])		\| 4.2.2.1 \|\| Level 3 \|\| Probably global (routed via [http://en.wikipedia.org/wiki/Anycast Anycast])
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	>		>

			== Propagation ==
			One of the features of DNS is the way that records get cached around the globe. Meaning that any changes to existing records have to ripple around. Generally changes take up to 72 hrs (3 days) to take effect.

			However, you can change the [[Acronyms#T\|TTL]] of record to ensure that it needs to be refreshed from its authoritative name-server more frequently than normal, ensuring that any changes apply more quickly.

			'''To view the propagation of a record around the world see http://www.whatsmydns.net'''

	== Notes ==		== Notes ==

Sstrutt: Updated formatting and links

2012-05-09T13:03:39Z

Updated formatting and links

← Older revision		Revision as of 13:03, 9 May 2012
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	== DNS Servers Open to Public Query ==		== DNS Servers Open to Public Query ==
	{\|~~cellpadding="2" cellspacing="0" border~~="1"		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.
	\|- ~~style="background-color:#bbddff;"~~
			{\|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 \|\| ~~Verizon~~		\| 4.2.2.1 \|\| Level 3 \|\| Probably global (routed via [http://en.wikipedia.org/wiki/Anycast Anycast])
	\|-		\|-
	\| 4.2.2.2 \|\| ~~Verizon~~		\| 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.

	{\|~~cellpadding~~="~~2" cellspacing="0" border="1~~"		{\|class="vwikitable"
	\|- ~~style="background-color:#bbddff;"~~		\|-
	! 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]]

Sstrutt: Initial creation

2011-10-20T12:12:43Z

Initial creation

New page

== DNS Servers Open to Public Query ==
{|cellpadding="2" cellspacing="0" border="1"
|- style="background-color:#bbddff;"
! IP Address !! Provider !! Location
|-
| 8.8.8.8 || Google
|-
| 8.8.4.4 || Google
|-
| 156.154.70.1 || DNSadvantage
|-
| 156.154.71.1 || DNSadvantage
|-
| 208.67.220.220 || OpenDNS || Global, mainly US (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])
|-
| 4.2.2.1 || Verizon
|-
| 4.2.2.2 || Verizon
|-
| 194.72.9.34 || [http://www.bt.com/ BT] || UK
|-
| 194.72.9.34 || [http://www.bt.com/ 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 <code>nslookup</code> from the command line.

{|cellpadding="2" cellspacing="0" border="1"
|- style="background-color:#bbddff;"
! Command !! Description
|-
| <code> server </code> || Displays the DNS server(s) currently being used by nslookup
|-
| <code> server 8.8.4.4 </code> || Changes the DNS server being used/queried to 8.8.4.4
|-
| <code> host.domain.com </code> || Attempts to resolve <code> host.domain.com </code> against current DNS server
|-
| <code> 109.123.76.85 </code> || Attempts a reverse lookup for IP <code> 109.123.76.85 </code> against current DNS server
|-
| <code> set q=mx </code> || Set query type to <code>MX</code> (subsequent queries will look for Message Exchange (email) records)
|-
| <code> set q=all </code> || Set query type back to all records
|-
| <code> exit </code> || 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
>