---
description: 1.1.1.1 supports RFC 8509 root key trust anchor sentinels to help diagnose DNSSEC root key rollovers.
title: RFC 8509 root key trust anchor sentinel support
image: https://developers.cloudflare.com/changelog/post/2026-09-24-root-key-trust-anchor-sentinel/og.png?v=5822cd630b2b5d4f
---

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September 24, 2026

## RFC 8509 root key trust anchor sentinel support

[1.1.1.1 (DNS Resolver)](https://developers.cloudflare.com/1.1.1.1/)

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2026-09-24-root-key-trust-anchor-sentinel/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

1.1.1.1 now supports [RFC 8509 ↗︎](https://datatracker.ietf.org/doc/html/rfc8509) root key trust anchor sentinels. They let you check whether the responding resolver trusts a DNSSEC root key ahead of a key rollover.

To check for KSK-2024 (key tag 38696), query DNSSEC-signed names in `dnstest.dev`:

```sh
# On a sentinel-aware resolver that trusts KSK-2024:

# Returns NOERROR with an A answer.
dig @1.1.1.1 root-key-sentinel-is-ta-38696.dnstest.dev. A +noall +comments +answer

# Returns SERVFAIL without an answer.
dig @1.1.1.1 root-key-sentinel-not-ta-38696.dnstest.dev. A +noall +comments +answer

# CD bypasses sentinel processing and returns the original A answer.
dig @1.1.1.1 root-key-sentinel-not-ta-38696.dnstest.dev. A +cdflag +noall +comments +answer
```

For background on DNSSEC validation, refer to [DNSKEY](https://developers.cloudflare.com/1.1.1.1/encryption/dnskey/).

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```