US ISP IPv6 support › AT&T

Does AT&T support IPv6?

Yes. AT&T Fiber and AT&T Internet provide native dual-stack IPv6 alongside IPv4, and the AT&T gateway enables it by default.

Run the full IPv6 connectivity test → It also checks dual stack, DNS, response times and large packets.

How AT&T delivers IPv6

• The AT&T gateway (for example the BGW210 or BGW320) receives an IPv6 prefix from AT&T by DHCPv6 prefix delegation and advertises a /64 to the devices on its own Wi-Fi and LAN ports.
• Devices connected directly to the gateway get IPv6 automatically through SLAAC. No setting needs to be changed on the device.

Getting IPv6 on your own router

1. Set the AT&T gateway to IP Passthrough for your router, then set the router’s WAN to DHCPv6 (sometimes labelled “Native” or “Automatic”).
2. Enable DHCPv6 prefix delegation on the router’s WAN and request a /64. The gateway hands out /64 subnets from its own prefix; asking for a larger prefix such as /60 usually gets no IPv6 at all.
3. Restart the router after enabling passthrough so it requests a new IPv6 lease.

If the test finds no IPv6

• Check that IPv6 is switched on in the gateway’s Home Network IPv6 settings.
• If only devices behind your own router lack IPv6, the router is usually not requesting a /64 prefix from the gateway.
• AT&T’s mobile network uses a different network (AS20057) and is not included in the numbers on this page.

About these numbers

The measured rate is the share of connectivity tests on this site, run from AT&T connections in the United States, in which IPv6 worked. Source: AT&T fixed-line network AS7018. Tests are counted, not people, so someone who tests several times is counted several times; no IP addresses are stored. A rate below 100% usually means some customers have IPv6 switched off on their router or use a router that does not request IPv6, not that the network lacks IPv6.

Other US providers: Comcast Xfinity · Verizon · T-Mobile