How do I setup an AT&T Internet Static IP?
AT&T Static IPs are available as a bolt-on; priced at a premium on top of the price of AT&T Internet service.
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.
Static IP Block sizes come in 8, 16, 32, 64, & 128 at this time
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. 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 computer must have a static/fixed configuration.
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
Static IP Calculator
A Static IP Calculator uses the customer's CIDR block to determine the correct static IP provisioning information for that customer's gateway.
A CIDR block is the IP address/prefix size combination (e.g 184.108.40.206/29).
The customer should receive the CIDR block when ordering service and can be provided by customer care.
Enter the CIDR block in your favorite CIDR calculator or you can use this CIDR calculator at your convenience.
AT&T Static IP Eligibility
Eligible customers include consumer and business, new install and existing, AT&T Internet customers. The customer needs one of the following RGs:
Note: An AT&T Static IP cannot be provisioned with the Motorola 2210-02-1ATT modem or the Motorola 2310-51 modem.
Static IP Block Example
In this example, the customer has a block of eight (Static IP Addresses):
This is the network base address is not usable as a host address.
Usable host address:
This is the last usable address. Assign this address to the gateway/RG.
This is the broadcast address and not usable as a host address.
Note: In all Static IP block options, always assign the first and last IP address as the network base address and the broadcast address. Always assign the second to the last as the gateway/RG. The customer cannot assign these three IP addresses to any of their local devices. However, any IP address between the first, second to the last, and the last IP addresses are eligible to assign to local devices.
- Block of 08: (05 are usable by the customer)
- Block of 16: (13 are usable by the customer)
- Block of 32: (29 are usable by the customer)
- Block of 64: (61 are usable by the customer)
- Block of 128: (125 are usable by the customer)
Gateway/RG IP address is always an even number. See example address above (220.127.116.11).
Use the following chart to determine the correct subnet to use.
Note: In this example, you are seeing screen shots from an ARRIS router model. The view may vary depending on your router model.
Public Static IP Subnet Setup
1. Launch a browser window and navigate to IP address 192.168.1.254.
2. Click Home Network > Subnets & DHCP.
3. If prompted, enter the device access code. The device access code (system password) is a 10-digit code found on the side of the RG.
- If you changed the system password, enter that new password.
4. Under Public Subnet heading, toggle the Public Subnet Enable from Off to On.
- Choose either Public or Private IPs. Do not mix these two selections.
5. In the Public Gateway Address field, enter the router address of the public static block. This is the second from the last IP address in the IP block.
6. In the Subnet Mask field, enter the subnet mask.
7. In the DHCPv4 Start Address and DHCPv4 End Address fields, enter the first and last usable IP address.
8. In the Primary DHCP Pool section, click either Public or Private IPs. Do not mix these two selections.
- Private means the next IP the RG assigns to a device is a local 192.xxx address.
- Public means the next IP the RG assigns to a device is one of the five public IP addresses. In this case, one of the 144.157.80.xxx addresses.
9. Click Save.
Assign an IP
1. Sign in to your router/gateway using https://192.168.1.254 in your web browser.
2. Once signed into router then click 'Home Network' tab
3. Next 'IP Allocation’
4. Then click 'Allocate'
5. Then you can choose a public IP to assign to your specific device you are allocating the IP.
This will tell the router to always assign that IP to a particular device and it is not necessary to make changes to device IP settings.
Jared, AT&T Community Specialist
AT&T Customer Care
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