DNS over HTTPS vs DNS over TLS: Which Is Best for Online Privacy?

When it comes to privacy online, basic traffic protection becomes a top priority for users. Setting up the DNS over HTTPS protocol helps hide your browsing history from prying eyes and protects against data interception.

By default, devices send network queries to servers in plain text, without any protection. This means your internet provider, a corporate network administrator, or even a hacker on public Wi-Fi can easily track every website you visit.

Encrypting DNS queries is the solution to data leakage. In this article, we'll take a closer look at DoH and DoT technologies, explore the architectural features of the DNS over TLS standard, and determine which is more reliable-DNS over HTTPS or DNS over TLS-for securing your home network and personal devices.

Why Encrypt DNS Queries and What Can Your Provider See?

By default, the domain name system works like an open phone book. When you type a website address into your browser, your device sends a query to a server to find out the IP address of the resource. We discussed this basic data exchange process in detail in the article How DNS Works: The Internet's Phone Book Explained Simply. The main vulnerability of the classic approach is that queries are transmitted completely in plain text.

Any transit node between your computer and the destination server-home router, ISP equipment, or a public Wi-Fi hotspot-can intercept, read, or even modify this data packet. ISPs legally use this transparency to collect user analytics, restrict access to sites as required by regulators, and prioritize certain traffic types.

It's important to understand: even if a website itself is protected by a certificate (the browser shows a padlock for HTTPS), your provider can't see the page's content or passwords you enter, but it can still track exactly which domain you access. Robust DNS query encryption closes this loophole, preventing third parties from collecting your browsing history.

How DNS over HTTPS (DoH) Works

The DoH technology elegantly hides DNS server requests inside regular web traffic. To any outside observer, including the deep packet inspection (DPI) systems used by ISPs, it looks as if you're simply browsing a standard secure HTTPS page.

This protocol uses port 443, the same one used by most modern websites. Isolating and blocking only DoH traffic is nearly impossible. An ISP would have to either try to decrypt all the traffic (which is impossible without keys) or block the IP addresses of public DNS servers entirely, which would inevitably impact many other legitimate services.

In practice, DNS over HTTPS has become hugely popular thanks to integration at the software level. Leading browsers like Chrome, Edge, and Firefox can send such requests independently of the operating system's global settings. This allows users to hide their activity with just a couple of clicks, without needing to reconfigure their router.

What Is DNS over TLS (DoT) and How Does It Differ?

The DNS over TLS (DoT) standard solves the same privacy problem but at a different network level. Instead of disguising queries as web pages, this method creates a dedicated, encrypted tunnel between your device and the DNS server, using the TLS cryptographic protocol.

The key feature of DoT is its use of a strictly dedicated port 853. Network equipment can clearly see that DNS service data is being transmitted, though the contents of the packets remain securely encrypted.

This approach is highly valued by corporate network administrators. The dedicated port makes it easy to manage traffic, monitor infrastructure for anomalies, and filter malicious requests directly at the router level.

Comparing DoH and DoT: What Sets Them Apart?

To determine whether DNS over HTTPS or DNS over TLS is better for your needs, it's essential to compare how they behave in real-world scenarios. Their architectural differences directly affect resilience to blocking and response speed.

Network Ports and Bypassing Blocks

Since DNS over TLS is tied to port 853, an ISP or government firewall only needs to close this specific gateway. Once this happens, your device simply can't connect to the secure server, and web surfing stops until you change your settings.

The DoH protocol, running over standard port 443, can't be blocked so easily. Attempting to close this port would disrupt most of the internet in a region, including banking apps, marketplaces, and major platforms.

Performance and Speed

Technically, data exchange over port 853 is a bit faster. The protocol doesn't use the extra HTTP header "wrapping," which reduces packet size and basic connection latency.

With DoH, the device must spend additional resources forming HTTPS requests. However, with modern internet speeds and processor power, this difference is measured in milliseconds and is completely unnoticeable for most users.

Which Should You Choose for Your Home Network and Devices?

Your choice depends on where you're configuring encryption and who you want to protect against. For smartphones and browsers on PCs, DoH is the optimal solution. It ensures access to the resources you need even in tightly controlled corporate or public Wi-Fi networks.

At the home router level, it makes more sense to use DNS over TLS. The router can process clean service traffic over a dedicated channel, without mixing it with video streaming or heavy web pages, which reduces hardware load.

Remember, hiding DNS queries doesn't make you completely invisible-your provider can still track the final IP addresses of your connections.

Conclusion

Both protocols successfully achieve their main goal: they reliably hide your browsing history from interception and monitoring by your ISP. The final choice depends on where you're setting up protection and which devices you use.

For personal gadgets, smartphones, and work PCs, DNS over HTTPS remains the ideal solution. It perfectly mimics regular web surfing, can be enabled with a couple of clicks inside your browser, and works flawlessly even on public networks with strict restrictions.

If your aim is to protect your entire home infrastructure, confidently set up DNS over TLS on your router. This will shield smart TVs, consoles, and IoT devices, lower the load on your network processor, and ensure stable operation without conflicts with web traffic.

Frequently Asked Questions (FAQ)

How do I set up DoH in my browser?

In modern browsers (Chrome, Edge, Firefox, Yandex.Browser), this feature is built-in by default. Go to privacy and security settings, find the "Secure DNS Server" section, and toggle it on. You can choose providers like Cloudflare (1.1.1.1) or Google (8.8.8.8).

How do I enable DNS over TLS on my router?

You'll need a router that supports modern encryption protocols (such as Keenetic, MicroTik, or OpenWrt firmware). In the control panel, go to internet connection settings, enable DNS encryption, and specify the addresses of your chosen servers along with their domain names for TLS certificate verification (for example, dns.adguard-dns.com).

Can my ISP block DoH and DoT?

Blocking DoT is very easy-a provider simply closes port 853 on backbone equipment, and your encrypted queries will stop going through. Blocking DoH specifically is nearly impossible: it runs on port 443 alongside millions of regular websites, and trying to block it would break much of the internet for the provider's network.