The Dynamic IP Addressing System
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DynamIP Technical FAQ

Newest FAQ answers are found at the bottom of the page.

Answers to the following questions are available:

How does DynamIP work?

DynamIP runs a special web server, connected to a customized DNS server. You run the DynamIP IPGet application on your PC. IPGet sits and watches your machine's IP configuration. When it detects that you have connected to the Internet, it contacts the DynamIP server and tells the server its IP address, along with authentication information. The DynamIP server, after confirming that the client is a valid user, updates the DNS server with the new IP address.

What version of Windows do I need?

DynamIP works with all versions of Windows except Windows 3.1.

When I am disconnected, DynamIP reports my IP address as "".

This is by design. The IPGet client program updates the DynamIP server every fifteen minutes with its current IP address. If the DynamIP server does not see an IP update for more than twenty minutes, it assumes that the client PC has gone offline, and the IP is changed to "". This is to prevent your DNS name from pointing to someone else's PC.

I am running IPGet, but when I try to connect to my DynamIP address, it tells me it can't connect, or that the server isn't responding.

Depending on how your ISP has set up their servers, there can be a delay of several minutes (and in some cases, up to 60 minutes) between the time you start up the DynamIP application and when your server is recognized. This is due to the settings on your local ISP's nameserver (DNS). Some ISP's have their nameservers set up to update only once per day. Your ISP's nameserver may not refresh as often as DynamIP's records request it to, and as a result, it may be some time before you have updated and accurate information available to resolve your address. Try leaving IPGet running for some time (up to an hour). If it still doesn't work, let us know.

I use Linux/Macintosh/etc. Can I use DynamIP?

DynamIP updates the main server automatically using an application called IPGet. IPGet operates under Windows 95/98 and NT only. However, if you are able to write your own programs and/or simple scripts, it is possible to use DynamIP with other operating systems such as Macintosh, Linux, or Unix. For details, see the Other OS information page.

The address I need to select in IPGet is grayed out.

Certain addresses are used as private IP addresses, reserved for private internal internets (or intranets). These addresses cannot be used on the outside Internet. Therefore, IPGet identifies these addresses and will not allow you to use them. These addresses are:

172.16.X.X to 172.31.X.X

(the "X" indicates any number)

IPGet reports that it cannot find an IP address or adapter.

You may be running your operating system using some language other than English. In this case, IPGet does not know how to "find" the adapter or IP Address information from the operating system. Click the "Show Details" button. You should see something like this:

Windows NT IP Configuration

Host Name . . . . . . . . . : something
DNS Servers . . . . . . . . :
Node Type . . . . . . . . . : Broadcast
NetBIOS Scope ID. . . . . . :
IP Routing Enabled. . . . . : No
WINS Proxy Enabled. . . . . : No
NetBIOS Resolution Uses DNS : No

Ethernet adapter FET1:

Description . . . . . . . . : AcerLAN ALN-320 10/100 Base-TX Fast Ethernet adapter
Physical Address. . . . . . : 00-60-67-43-A9-10
DHCP Enabled. . . . . . . . : No
IP Address. . . . . . . . . :
Subnet Mask . . . . . . . . :
Default Gateway . . . . . . :

The two lines we are concerned with are shown in red: Description and IP Address. An example of how they may appear in an operating system set to a different language is shown here:

Hostnaam . . . . . . . . . . . : something
DNS-servers. . . . . . . . . . :
Knooppunttype. . . . . . . . . : Hybride
Bereik-ID NetBIOS. . . . . . . :
IP-routing ingeschakeld. . . . : Nee
WINS Proxy ingeschakeld. . . . : Nee
NetBIOS-omzetting gebruikt DNS : Nee

Ethernet adapter FET1:

Beschrijving . . . . . . . . . : AcerLAN ALN-320 10/100 Base-TX Fast Ethernet adapter
Fysiek adres . . . . . . . . . :
DHCP ingeschakeld. . . . . . . : Nee
IP-adres . . . . . . . . . . . :
Subnetmasker . . . . . . . . . :
Standaardgateway . . . . . . . :

Notice that "Description" has changed to "Beschrijving" and "IP Address" has changed to "IP-adres". You will need to change IPGet's language settings. To do this, click on File/Change Language from the main screen.

Where it states "IP Address Caption" you would type "Beschrijving", and where it states "Description Caption" you would type "IP-adres". Note that the case (upper case/lower case) does matter, so make sure you copy it exactly as it is shown in the details screen.

I've forgotten my password.

You can have DynamIP email you your password information from the login page.

I can't get DynamIP to work. I am running IPGet, but when I try to connect to my address, it doesn't work.

Check your "Account Expiry" date. If it is blank, this indicates that your IPGet program is not actually contacting the DynamIP server. IPGet uses your PC's Internet Explorer web libraries to contact the DynamIP server, so ensure that you can connect to the Internet properly using Internet Explorer. Also check that you are running Internet Explorer version 4 or higher. If you still cannot get it to work, click on File/Debug and send the resulting file to .

I want to use DynamIP, but I'm behind a firewall, or I want to upload a specific IP address to the server.

Up until now, IPGet could not run behind a firewall, because it could not identify the IP address being used by the firewall. By request, we have added the capability to IPGet to allow it to read the current IP address from a file rather than from the host PC's Internet stack. This function is for advanced users!

To enable this function, select Config/IP Capture From File from the menu. After confirming this is what you wish to do, the IP address selection options will disappear and will be replaced by a filename box. Type the path and filename of the file containing the IP address.

The file itself should be a text file, containing only the IP address, on the first line by itself, i.e.:

If the IP address in the file is invalid, it will not be transmitted to the DynamIP server.

Once IPGet has been configured to use this file, it will do its regular updates using the address found in this file rather than reading the Internet stack information. If the number in the file is updated (by an ASP file, for instance), IPGet will update the DynamIP server with the new IP address.

This can be used to always transmit the same IP address to the DynamIP server, or to update it with an address which is generated elsewhere.

I want to use DynamIP, but I'm behind a firewall

Another way that IPGet can now operate through a firewall is by having the DynamIP server pick up the IP address used by the IPGet application directly. To enable this, select Config/Automatic IP Capture from the menu. After confirming this is what you wish to do, the IP address selection options and filename box will disappear.

Once IPGet has been configured to operate this way, it will do its regular updates, but the DynamIP server will recognize the address used by the IPGet application, and use that address to update the server. This means the firewall's address, not the internal address, will be used as the updated address.

This option can actually be used by most people successfully, whether they are operating through a firewall or not.

Have any other questions? Please email us at and we will add your questions (and our answers) to the FAQ.

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