ST-2026-044 · Enforcement & amendments
Cloudflare removes foundation_dns in favour of nameservers.type
Cloudflare deprecated the foundation_dns boolean for zone DNS settings and account defaults and will stop returning or accepting it during a seven-day rollout beginning 23 November 2026.
Previous state
Clients read and wrote a foundation_dns compatibility boolean.
Current state
Clients must use nameservers.type with cloudflare.advanced or cloudflare.standard; PATCH requests containing foundation_dns will be rejected after rollout.
Affected users
Who needs to care
DNS automation owners and API clients managing zone or account default nameserver settings.
Required response
What to do
Replace the boolean field, map both supported nameserver types and test read and update behaviour before the rollout window.
Evidence boundary
What the source does not prove
The change concerns API representation and compatibility rather than a Foundation DNS subscription or a forced zone migration. Exact account rollout day varies within the stated seven-day window.
Lifecycle history
Dated event sequence
- Change documented
Cloudflare deprecated the foundation_dns boolean for zone DNS settings and account defaults and will stop returning or accepting it during a seven-day rollout beginning 23 November 2026.
- Effective milestone
Clients must use nameservers.type with cloudflare.advanced or cloudflare.standard; PATCH requests containing foundation_dns will be rejected after rollout.
- Transition rollout expected
Cloudflare plans an earlier seven-day compatibility rollout before the final removal window.
Evidence ledger
First-party sources
- 01Cloudflare Developers — Cloudflare API deprecations
Official product documentation or changelog · 2026-07-27
Open official source ↗