1. Cloudflare 1.1.1.1. 2023. Backend IP address of Cloudflare DNS server. https: //www.cloudflare.com/zh-cn/ips/
2. Google 8.8.8.8. 2023. Backend IP address of Google DNS server. https://www.gsta tic.com/ipranges/publicdns.json
3. AdGuard. 2022. DNS-over-QUIC is now officially a proposed standard. https: //adguard.com/en/blog/dns-over-quic-official-standard.html
4. S. Basso. 2020. DNS over TLS blocked in Iran. https://ooni.org/post/2020-iran-dot/
5. S. Basso. 2021. Measuring DoT/DoH blocking using OONI probe: a preliminary study. In NDSS DNS Privacy Workshop.