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Feature•Oct 13, 2026

Request Gateway DNS64 through DNS locations and EDNS

Cloudflare OneCloudflare · Cloudflare One

You can now request DNS64 through Cloudflare Gateway DNS location settings or Extension Mechanisms for DNS (EDNS) options.

DNS64 synthesizes AAAA records from A records for IPv6-only networks. These networks require network address translation from IPv6 to IPv4 (NAT64).

Turn on Enable DNS64 for a location, or include an empty EDNS option 65051 in individual queries. Both mechanisms support UDP, TCP, DNS over TLS (DoT), and DNS over HTTPS (DoH).

For example, request DNS64 through EDNS with dig:

dig @"<DNS_RESOLVER_IP>" ipv4only.arpa AAAA +ednsopt=65051 +short

The existing cf-dns-options: dns64 DoH header remains supported independently. DNS64 is off by default. Each mechanism independently requests synthesis.

For configuration, API update behavior, and request examples, refer to DNS64.

Read the original announcement↗

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