Is DNS traffic blocked

Estimated reading time: < 1 min

Introduction

In our ongoing commitment to maintaining a secure and reliable network, we have recently taken the precautionary measure of blocking DNS traffic across our network. This decision was made in response to a growing risk of (DDoS) attacks specifically targeting DNS servers, which can disrupt network services and compromise security.

DNS resolvers / servers used:

To ensure that your servers continue to function, we recommend configuring them to use the following DNS resolvers / servers:

Snel.com DNS

89.207.128.252
89.207.130.252

Cloudflare DNS

1.1.1.1
1.0.0.1

Google DNS

8.8.8.8
8.8.4.4

Quad9 DNS

9.9.9.9
149.112.112.112

Level3 DNS

209.244.0.3
209.244.0.4

Level3 DNS – alternative

4.2.2.1
4.2.2.2
4.2.2.3
4.2.2.4

Comodo DNS

8.26.56.26

OpenDNS

208.67.222.222
208.67.220.220

Please update your server configurations accordingly.

Conclusion

This article is designed to inform users about the blocking of DNS traffic and provide a list of DNS resolvers / servers which are not blocked.

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