HT1529 what is my iMac DNS IP address

What is my iMac DNS IP Address. I (think) I need it to get my apple TV to work. I had it working yesterday and today it says NO. (I did nothing different, except turned it on!!) It doesn't recognise that I have authorised my iTunes account (several times).

You can determine your Mac's IP address by opening Sytem Preferences, selecting Network and then selecting the interface you are using to connect to your home network (either Ethernet or WiFi). As for its DNS IP address, the Mac will not have its own DNS address. This will typically be the IP address of the wireless router, if WiFi is being used, or your ISP.
For your Apple TV to see the Mac, this will use Bonjour to locate the Mac on the local network. So the important thing is that your Mac and the Apple TV are set to the same IP subnet. This is usually the first three sets of numbers in your IP address, while the last number is known as the network address. For example, a Mac with an IP address of 10.0.1.4 has an IP subnet of 10.0.1 and a network address of 4. For other devices using Bonjour to communicate with this Mac, they also need an IP subnet of 10.0.1 but a different network address to 4.
The other important IP address setting is the router address, aka gateway. For all devices to communicate with each other on a local network, they must have the same router address, which is the IP address of the wireless router or Ethernet switch.
Now I don't have an Apple TV so I don't know the network settings menu but I would expect that it is set to DHCP, meaning that it is relying on the router to provide it with an IP address. The theory would then go that you would also set the Mac to DHCP so that the router can allocate a dedicated IP address to the Mac and Apple TV and any other device on your network. If any device is set to manual assignment then this could be your issue. Are you able to confirm what network settings the Mac and Apple TV are using and post back here?

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Hi
The format of email addresses is
local-part@domain where the local-part may be up to 64 characters long and the
domain name may have a
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The formal definitions are in RFC 5322 (sections 3.2.3
and 3.4.1) and RFC 5321 - with a more readable form given in
the informational RFC 3696[2]
and the associated errata.
Local part
The local-part of the email address may use any of these
ASCII characters
RFC 5322 Section
3.2.3:
Uppercase and lowercase English letters (a–z, A–Z) (ASCII: 65-90, 97-122)
Digits
0 to
9 (ASCII: 48-57)
Characters
!#$%&'*+-/=?^_`{|}~ (ASCII: 33, 35-39, 42, 43, 45, 47, 61, 63, 94-96, 123-126)
Character
. (dot, period, full stop) (ASCII: 46) provided that it is not the first or last character, and
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o
Space and
"(),:;<>@[\] (ASCII: 32, 34, 40, 41, 44, 58, 59, 60, 62, 64, 91-93)
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space, backslash \ and
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\ (e.g.
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Domain part
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Valid email addresses
<tt>[email protected]</tt>
<tt>[email protected]</tt>
<tt>[email protected]</tt>
<tt>much."more\ unusual"@example.com</tt>
<tt>very.unusual."@"[email protected]</tt>
<tt>very."(),:;<>[]".VERY."very@\\\ \"very"[email protected]</tt>
Invalid email addresses
<tt>Abc.example.com</tt> (an @ character must separate the local and domain parts)
<tt>[email protected]</tt> (character dot(.) is last in local part)
<tt>[email protected]</tt> (character dot(.) is double)
<tt>A@b@[email protected]</tt> (only one @ is allowed outside quotation marks)
<tt>a"b(c)d,e:f;g<h>i[j\k][email protected]</tt> (none of the special characters in this local part
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<tt>just"not"[email protected]</tt> (quoted strings must be dot separated, or the only element making
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<tt>this is"not\[email protected]</tt> (spaces, quotes, and backslashes may only exist when within
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<tt>this\ still\"not\\[email protected]</tt> (even if escaped (preceded by a backslash), spaces, quotes,
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Terence Yu
TechNet Community Support

Manually provided DNS server addresses are higher priority than DHCP's

Disclaimer: Apple does not necessarily endorse any suggestions, solutions, or third-party software products that may be mentioned in the topic below. Apple encourages you to first seek a solution at Apple Support. The following links are provided as is, with no guarantee of the effectiveness or reliability of the information. Apple does not guarantee that these links will be maintained or functional at any given time. Use the information below at your own discretion.
With the recent revelation of DNS server security issues, many have expressed a desire to use DNS servers they know to be secure rather than the servers specified by their routers via DHCP, which often are those of a particular ISP.
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208.67.220.220
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nameserver 208.67.222.222
nameserver 208.67.220.220
nameserver 192.168.0.253
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Do you want to provide feedback on this User Contributed Tip or contribute your own? If you have achieved Level 2 status, visit the User Tips Library Contributions forum for more information.

That's very good to KNOW.
I figured it as such as I have some manual entries for the office and I don't use profiles, so it stays there when I go home.
I notice a slow-down when office DNS entries are used at home -as one would suspect.
I do like KNOWING that it's the case though - thanks for the info!
Scott

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Why doesn't my airport express router issue proper DNS server address to DHCP clients?

I have an Airport express router (version 7.6.4). It was configured to connect to internet via a cable modem, acting as a router with NAT. This means it obtians WAN address from cable modem, and in LAN it assumes IP address 10.0.1.1 as a gateway, and issue IP address to my 4-5 wireless clients (MBA, iPads, PCs) vi DHCP.
However I recently encounter an issue, that the router no longer issues DNS server address obtained from Cable Modem(206.x.x.x) but instead tell every DHCP client to use router ip address (10.0.1.1) as DNS server. I was pretty sure before Dec 2013 it is issueing (206.x.x.x) to all DHCP clients.
Apparently now the Airport express is acting as a DNS server or as a DNS cache. This works sporadically and very often result in long DNS look up or DNS look up failure.
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My network otherwise works fine. for some of the Clients (e.g. one MBA) I configured DNS for it mannually and it's internet is working very smoothly.

But this will be a problem for my ipad and iphone that uses wifi.
These devices either allow full DHCP. If you need to mannually enter DNS server, you will need to turn entire IP configuration to mannual and that will be a problem for me.

Detect "Obtain DNS server address automatically" set

Can anyone help me with a minor issue?
I am trying to detect if this setting is set to manual or automatic
I am currently using this code
Get-WmiObject -Class Win32_NetworkAdapterConfiguration -Filter "IPEnabled=TRUE" | Select PSComputerName,DNSServerSearchOrder
The problem is it returns the servers and not the actual setting of automatic vs manual.
Powershell v2

Hi JustuslV,
Optionally, you can retrieve or set a value corresponding to "Obtain DNS server address automatically" by using the two registry entries, DhcpNameServer and NameServer, which you can find at the following registry location:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces
\{AdapterIdentifier}
If the value of NameServer is null, the client tries to obtain a DNS server address automatically from the DHCP server.
Refer to:
Part 5: Scripting DNS on Clients
And you can refer to this script to get the related registry value:
$adapter=Get-WmiObject -Class Win32_NetworkAdapterConfiguration -Filter "IPEnabled=TRUE" | select -ExpandProperty SettingID
$path='HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces'
Get-ItemProperty -Path "$path\$adapter" -Name Nameserver|select -ExpandProperty NameServer
If there is anything else regarding this issue, please feel free to post back.
Best Regards,
Anna Wang

HT1529 what is my iMac DNS IP address

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