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About Static IP addresses

Learn about static IP addresses, how they differ from dynamic IP addresses, and why you might need one.


ArticleDETAILED INFO

Static IP address information

Static IP Address

A static IP address is an IP Address associated with your account that never changes and can be assigned to a specific device. Every time that you connect to the AT&T network the static IP address routes traffic to the computer or device that can be assigned an IP (such as a router or firewall). This allows you to host a variety of applications that can be accessed remotely.

How dynamic and static IP addresses differ
A dynamically assigned IP (Internet Protocol) address is one that is assigned by a DHCP (Dynamic Host Configuration Protocol) server, contributing to a transparent experience. This is how most ISP and corporate networks are configured.

A static or fixed IP address requires you to manually configure your IP address, along with other settings such as the gateway, the subnet mask, and DNS (Domain Name Service) settings into your network properties. Notebook computers do not require static IP addresses for basic connectivity to the internet and access to email. However, some networks and ISPs do not provide a DHCP server; in that case, the notebook computer must have a static/fixed configuration.

AT&T Wi-Fi can support PCs with fixed or static IP addresses, although in some cases these do require configuration changes. Some applications such as VPNs (Virtual Private Network) and routers may require a static IP address provided by AT&T Wi-Fi in order to gain access to the internet. An AT&T Wi-Fi provided static IP is only available in meeting rooms.

When a static IP might be useful
A static IP is useful for consumers and many small businesses that have minor needs such as:
  • Host a web, mail or FTP server
  • Access a corporate network remotely
  • Host a webcam for video streaming
  • Use video conference applications
 
Number of static IP addresses available
When you purchase a block of internet static IP addresses, three addresses will be used right off the bat for the network base address, your Wi-Fi gateway, and your broadcast address. In other words, the number of usable addresses is your total number of addresses in your block minus three. See the table below for specifics.

Block Sizes
Total Block SizeUsable Addresses
85
1613
3229
6461

How multi static IP addresses work
When you connect to the AT&T network you will get a Dynamic WAN address. The Dynamic WAN address is then associated with your static IP and acts as a gateway for the static IP addresses to reach the network. AT&T doesn't automatically assign static IP addresses to devices connected to the Dynamic WAN. In order to use your static IP addresses you will need to contact us to have your equipment configured.

Static DSL IP to static Internet IP
If you change internet services, you will have to change your static IP address. Internet static IP addresses are taken from a different pool. You may be able to add a generic reverse DNS service to all internet static blocks like DSL as well as establishing a delegation of authority for DNS. Please contact us to discuss your options.

Additional Help
Many static IP address issues can be resolved by AT&T Customer Support, including the following:
  • IP address changes
  • IP address cost
  • Lost IP addresses
  • Gateway is missing static IP addresses

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