---
title: DNS Flush Runbook
tags: [dns, network, cache, troubleshooting]
owner: netops
updated: 2026-06-10
---

# DNS Flush Runbook

## Symptoms

- DNS resolutions return stale IPs.
- Users report that a site "works on some machines and not on others".
- Recent DNS changes are not propagating.

## Diagnosis

1. Check the local cache with `ipconfig /displaydns` or `resolvectl statistics`.
2. Confirm the upstream resolver is responding.
3. Run the `dns-flush` webhook on the affected machine.

## Related webhooks

- dns-flush