---
title: "FAQs - qg58ahy9ww549ax"
language: "en-US"
canonical_url: "https://quad9.faceliftdesigns.com/docs-category/faqs/"
source_url: "https://quad9.faceliftdesigns.com/docs-category/faqs/"
content_type: "text/markdown"
---

## FAQs






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[Cache Flushing](https://quad9.faceliftdesigns.com/docs/cache-flushing/)
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[Oblivious DNS over HTTPS / ODoH](https://quad9.faceliftdesigns.com/docs/oblivious-dns-over-https-odoh/)
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[Network Providers / DNS Leak Tests](https://quad9.faceliftdesigns.com/docs/network-providers-dns-leak-tests/)
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[What is EDNS Client Subnet (ECS)?](https://quad9.faceliftdesigns.com/docs/what-is-edns-client-subnet-ecs/)
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[Detecting DNS Transparent Redirection (Hijacks)](https://quad9.faceliftdesigns.com/docs/detecting-dns-transparent-redirection-hijacks/)
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[Identifying a Quad9 block](https://quad9.faceliftdesigns.com/docs/identifying-a-quad9-block/)
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[Protocol Test – Confirm on which Protocol Quad9 received your query](https://quad9.faceliftdesigns.com/docs/protocol-test-confirm-on-which-protocol-quad9-received-your-query/)
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[How Do I Confirm I’m Using Quad9?](https://quad9.faceliftdesigns.com/docs/how-do-i-confirm-im-using-quad9/)
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[DNS over HTTPS – No HTTP/1.1 Support](https://quad9.faceliftdesigns.com/docs/dns-over-https-no-http-1-1-support/)
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[Quad9, DNS, and VPNs](https://quad9.faceliftdesigns.com/docs/quad9-dns-and-vpns/)