Big web browsers such as Microsoft , Google and Mozilla are moving DNS more and more over HTTPS (DoH). This technology enhances privacy and security in online.

What is DNS (DoH) over HTTPS?

For privacy and protection, DNS over HTTPS is essentially an extra layer over DNS. We now find that some of the modern web browsers raise an alarm when some sites use HTTP by displaying “Not Safe.” Some of them also have the encryption as in-built, which means that if someone observes or snoops on the online activity they do. The same can not be changed because the material is noticeable but can not be messed with. DNS is over 3 decades old, it uses numerical IP addresses to connect to the website via domain name. With the implementation of the “DoH” resolver in the HTTPS, which uses encryption, unauthorised snooping or access is prevented, making it very secure.

DNS links all the users to their internet service provider. Some independent or third party DNS servers, Cloudflare Public DNS and Open DNS, are among the pioneers in enabling DNS over HTTPS. The prerequisite is to have a DNS, and a supporting client.

Google Chrome and Mozilla Fox are currently testing the DOH, but Microsoft has announced it will soon implement DNS over HTTPS, meaning that all Windows networks benefit, Apple has not made any announcements yet.

In future the DNS over HTTPS (DOH) will function in various ways with different web servers. For instance, if DOH goes live on Chrome it will only use DOH if it is supported by the current DNS server on the device. If Comcast is your ISP, and they fail to support DOH, then Chrome will function without encryption as it currently does. In case they are supported by DoH for Cloudflare DNS, Google Public DNS or Open DNS, in these cases Chrome can use encryption to speak to your DNS server. This will give users a choice to do away with the web server that does not offer the DoH like Comcast while upgrading the link.

How does DNS work over HTTPS

By default, a DNS server that supports DNS over TLS should allow TCP connexion on port 853, otherwise it is necessary to configure both the clients and servers. In order to avoid complications, this can not be done with port 53 either, they must not send clear text DNS messages over TLS on any port used for DNS.

Following the success of connecting thru TCP to the DNS port over TLS it will proceed to the handshake. Now it’s up to the client to authenticate the server, which is now encrypted and secured from eavesdropping.

All requests and answers in an existing TLS session should be in the field of two-octet length, and the DNS clients and servers should pass the test of two-octet length to pass successfully. The number of queries in a session will be multiple to reduce the latency and not to wait for an outstanding response to the pending query before sending the next query.

For Firefox, Mozilla will support Cloudflare as the US provider of encrypted DNS. According to Microsoft DoH working in Windows 10, since Windows 10 will obey your default DNS server, DoH will be enabled if it is supported by your server of choice.

How to Activate HTTPS DNS in Chrome

According to Google, they simply allow support for secure DoH connexions in Chrome if it is offered by a user’s DNS provider of choice. Chrome will check whether the user’s DNS provider is among a list of participating DoH-compatible providers and, if so, will automatically enable DoH. If the DNS provider is not on the list, Chrome will not allow DoH and will continue to operate as it currently does. As the adoption of DoH increases, we expect the number of DNS providers with DoH-enabled to grow.

How to Activate HTTPS DNS in Firefox

  • Go to Menu Tools, and click Options
  • Scroll down to Network Setup and click Set button
  • Then click “Enable DNS over HTTPS” and the default from the drop-down menu will remain.


DNS ahead over HTTPS

Supporting OS

Microsoft revealed in November 2019 that it plans to add support to encrypted DNS protocols in Microsoft Windows, beginning with DoH.
DoH Helping Clients

1. Desktop AdGuard

2. Home AdGuard for iOS and AdGuard

3. The Cloudflare Android and iOS client app

4. Linux cloudflare-resolver

5. And Windows and MacOS

6. From 7.62.0 CURL

7. DNSCrypt-proxy — Local DNS via proxy HTTPS

8. DNSP-DNSProxy flexible. Implementation of DoH server (C) and client (Config), doh-php-admin — Config

9. Firefox before and after version 62-Support for the browser

10. Go-doh-proxy — Go Proxy Server on DoH

11. Intra — Jigsaw ‘s Android software, nss-tls — a DoH-based glibc resolver plugin, Technitium DNS Client — C#.NET multiplatform implementation,

12. NextDNS applications to clients

13. Nebulo – DNS over HTTPS / TLS – for Android devices like Ios, personalDNSfilter – DNS philtre with DoH and DoT support for Java enabled devices.

Get full GitHub list

It is commonly agreed that DoH is continuing work, despite the fact that RFC 8484 has been widely circulated by IETF as a proposed standard and testing is taking place and being regarded as the way it needs to be actualised. In addition, IETF is exploring various alternatives on how DoH is the most suitable approach to sending DoH by setting up a working meeting. Other working sessions, such as the DNS Deployment Initiative, are further framed to ‘characterize and support advances in DNS encryption as they are, which guarantee the elite flexibility, solidity and reliability of the basic namespace and name resolution services of the network, as well as the unimpaired functionality of reliability protection, parental control and

In either case, Split DNS in Businesses and CDN Localization are among the problems that are being resolved, not limiting it to Parental controls and content networks.