DNS over TLS (DoT) Lookup - Test Encrypted DNS on Port 853
All queries encrypted via TLS on port 853 • No logs stored
Query DNS records via TLS-encrypted connections on port 853. Compare results from 5 major DoT providers with TLS certificate details, cipher suites, and response times.
Free DoT Provider Testing Tool
DNS over TLS Lookup
Query DNS records via TLS on port 853 from 5 major providers
Port 853 • TLS Encrypted
Test Encrypted DNS Queries Across 5 DoT Providers
DNS over TLS (DoT) encrypts your DNS queries using TLS on dedicated port 853. This tool queries 5 major DoT providers simultaneously—Cloudflare, Google, Quad9, AdGuard, and NextDNS—showing TLS certificate details, cipher suites, and response times. Perfect for testing Android Private DNS configuration or finding the fastest DoT provider for your network.
What You'll Discover
Can Find
- DNS records from 5 DoT providers (Cloudflare, Google, Quad9, AdGuard, NextDNS)
- TLS version used by each provider (TLS 1.2 or TLS 1.3)
- Cipher suite and encryption strength (e.g., TLS_AES_256_GCM_SHA384)
- Certificate details (issuer, validity, subject CN)
- Response times to find the fastest provider from your location
- Consistency analysis showing if all providers agree
Cannot Find
- DNS leak testing (tests providers, not your network config)
- Custom DoT server testing (5 pre-configured providers only)
- DNSSEC validation status (TLS ≠ DNSSEC)
- Your device's current DNS configuration
- Continuous monitoring (single query per lookup)
How to Test DNS over TLS
Query encrypted DNS from 5 providers in seconds
Enter Domain Name
Type the domain you want to query (e.g., google.com). URLs with https:// and www prefixes are automatically cleaned.
Select Record Type
Choose A (IPv4), AAAA (IPv6), MX (mail servers), TXT (text records), NS (nameservers), or CNAME (aliases).
Click Query
We establish TLS connections to all 5 DoT providers on port 853 in parallel. Each query is encrypted end-to-end.
Compare TLS Details & Results
View TLS version, cipher suite, and certificate info from each provider. Compare response times to find the fastest resolver.
Understanding Your DoT Lookup Results
What each part of the multi-provider comparison reveals
Provider Name & IP
The DoT provider queried and their resolver IP address on port 853. We test Cloudflare (1.1.1.1), Google (8.8.8.8), Quad9 (9.9.9.9), AdGuard (94.140.14.14), and NextDNS (45.90.28.0). Quad9 blocks malware domains; AdGuard blocks ads.
Cloudflare (1.1.1.1:853)
TLS Version
The TLS protocol version used for the encrypted connection. TLS 1.3 is newer (2018), faster, and more secure than TLS 1.2. Most modern DoT providers support TLS 1.3. Prefer providers using TLS 1.3 for best security.
TLSv1.3
Cipher Suite
The encryption algorithm used to secure the DNS query. Shows the cipher name and key strength in bits. 256-bit AES-GCM is current best practice. Higher bit count = stronger encryption.
TLS_AES_256_GCM_SHA384 (256-bit)
Certificate Details
TLS certificate information proving the server's identity. Shows the certificate subject (server name), issuer (Certificate Authority like DigiCert), and validity period. Valid certificates confirm you're connecting to the real DNS provider, not an imposter.
Issued by DigiCert Inc, valid until Feb 2025
Response Time (ms)
How long each provider took to respond to your encrypted query on port 853. Includes TLS handshake time. Use this to find the fastest DoT provider from your location. Lower times = better performance.
45ms
Consistency Status
Whether all providers returned the same DNS records. Green = all agree, Yellow = mostly consistent, Red = significant differences. Differences may indicate DNS filtering (Quad9 blocks malware, AdGuard blocks ads) or caching variations.
All Providers Agree ✓
Why Use Our DNS over TLS Tool
The only tool that tests 5 DoT providers with full TLS details
Port 853 TLS Encryption
True DNS over TLS on dedicated port 853 as specified in RFC 7858. All queries encrypted using TLS, protecting your DNS lookups from eavesdropping.
5 Major Providers
Test Cloudflare, Google, Quad9, AdGuard, and NextDNS in one query. Each has unique features: speed, security, ad-blocking, or customization.
TLS Certificate Details
View certificate issuer, validity period, and subject for each provider. Verify you're connecting to legitimate DNS servers, not imposters.
Cipher Suite Information
See which encryption algorithms each provider uses. Compare TLS 1.2 vs 1.3 and cipher strength (128-bit vs 256-bit).
Response Time Comparison
Measure actual response times from each provider. Find the fastest DoT resolver for your location with visual performance bars.
Export Results
Download your DoT lookup results as JSON, CSV, or plain text. Perfect for documentation, security audits, or API integration.
When to Use DoT Lookup
Real scenarios where testing DNS over TLS matters
Find Your Fastest DoT Provider
Response times vary by location. Test all 5 providers to discover which one has the lowest latency from your network. Cloudflare is often fastest, but Quad9 or Google may be faster in your region.
Verify Android Private DNS
Android 9+ Private DNS feature uses DNS over TLS. After configuring Private DNS in your Android settings, use our tool to verify the connection is working correctly.
Security Audit
Check TLS versions used by DoT providers. Prefer providers offering TLS 1.3 with 256-bit encryption. View certificate details to verify server authenticity.
Test Port 853 Connectivity
Some networks block port 853 to prevent encrypted DNS. If all providers fail, port 853 may be blocked on your network—try DNS over HTTPS instead.
How DNS over TLS Works
DoT wraps DNS queries in TLS encryption on port 853, protecting your lookups from network observers. Here's how it works.
RFC 7858: The DoT Standard
DNS over TLS is defined in RFC 7858. Unlike traditional DNS (port 53, unencrypted), DoT uses port 853 with TLS encryption. The DNS query packet is identical to standard DNS, but wrapped in a TLS tunnel. Our tool queries all 5 providers using this standard protocol.
TLS 1.2 vs TLS 1.3
TLS 1.3 (released 2018) is the latest version with faster handshakes and stronger security. It eliminates vulnerable cipher suites and reduces round-trips. Most modern DoT providers support TLS 1.3. Our tool shows which version each provider uses—prefer TLS 1.3 when available.
DNS over TLS vs DNS over HTTPS
Both encrypt DNS queries, but differ in implementation. DoT uses dedicated port 853 with TLS directly on DNS—easier to identify and block. DoH uses port 443 (same as HTTPS) making it blend with web traffic—harder to block. DoT has less overhead (no HTTP layer). Use our DNS over HTTPS tool to test DoH.
Our 5 DoT Providers
We test 5 major DoT providers: Cloudflare (1.1.1.1) for speed and privacy, Google (8.8.8.8) for reliability, Quad9 (9.9.9.9) for security with malware blocking, AdGuard (94.140.14.14) for ad/tracker blocking, and NextDNS (45.90.28.0) for customizable filtering.
Android Private DNS
Android 9 and later have built-in Private DNS support using DNS over TLS. In Settings → Network → Private DNS, you can enter a DoT hostname like 'dns.google' or 'one.one.one.one'. This encrypts all DNS queries from your device. Use our tool to verify your Private DNS configuration is working.
DoT Lookup Specifications
- Protocol
- DNS over TLS (RFC 7858)
- Port
- 853 (dedicated DoT)
- Providers Tested
- Cloudflare, Google, Quad9, AdGuard, NextDNS
- TLS Versions
- TLS 1.2, TLS 1.3
- Record Types
- A, AAAA, MX, TXT, NS, CNAME
- Timeout
- 10 seconds per provider
- Cache Duration
- 5 minutes (300 seconds)
- Export Formats
- JSON, CSV, Plain Text
- API Access
- Available at /api/v1/dns-over-tls
Frequently Asked Questions
What is DNS over TLS (DoT)?
DNS over TLS is a protocol defined in RFC 7858 that encrypts DNS queries using TLS on port 853. Unlike traditional DNS (port 53) which sends queries in plain text, DoT wraps the entire DNS conversation in TLS encryption, protecting your lookups from ISPs, network operators, and anyone monitoring your traffic.
What is the difference between DoT and DoH?
Both encrypt DNS queries, but use different methods. DoT (DNS over TLS) uses dedicated port 853 with TLS encryption. DoH (DNS over HTTPS) encapsulates DNS in HTTPS on port 443. DoT is easier to identify and block (unique port), while DoH blends with web traffic. DoT has less overhead since it doesn't use HTTP.
Which DoT providers does this tool test?
We query 5 major DoT providers simultaneously: Cloudflare (1.1.1.1) for speed and privacy, Google (8.8.8.8) for reliability, Quad9 (9.9.9.9) for security with malware blocking, AdGuard (94.140.14.14) for ad blocking, and NextDNS (45.90.28.0) for customizable security.
What is port 853?
Port 853 is the dedicated port for DNS over TLS, assigned by IANA. Traditional DNS uses port 53 (unencrypted). By using a dedicated port, DoT connections are easily identifiable—which means they can be blocked by networks that want to prevent encrypted DNS. This differs from DoH which uses port 443.
Why might port 853 be blocked on my network?
Networks may block port 853 to: maintain DNS visibility for content filtering or security monitoring, enforce company policies, or implement censorship. If DoT doesn't work on your network, try DNS over HTTPS instead—it uses port 443 (same as HTTPS) and is much harder to block.
How do I enable Private DNS on Android?
Android 9+ has built-in Private DNS using DoT. Go to Settings → Network & Internet → Private DNS → Select 'Private DNS provider hostname'. Enter a provider hostname: 'dns.google' (Google), 'one.one.one.one' (Cloudflare), 'dns.quad9.net' (Quad9), 'dns.adguard-dns.com' (AdGuard), or 'dns.nextdns.io' (NextDNS).
Which DoT provider is fastest?
It depends on your geographic location. Run a query and compare response times to find the fastest provider for your network. Cloudflare is often fastest due to their global edge network, but Google, Quad9, or NextDNS may be faster in certain regions.
What do TLS 1.2 and TLS 1.3 mean?
These are TLS protocol versions. TLS 1.3 (released 2018) is more secure with faster handshakes, stronger encryption, and eliminates vulnerable cipher suites. Most modern DoT providers support TLS 1.3. Our tool shows which version each provider uses—prefer TLS 1.3 for best security.
What does the cipher suite mean?
The cipher suite is the encryption algorithm used to secure your DNS query. For example, TLS_AES_256_GCM_SHA384 means AES encryption with 256-bit key, GCM mode, and SHA384 for integrity. Higher bit counts (256 vs 128) mean stronger encryption. Our tool shows each provider's cipher.
Is DNS over TLS the same as DNSSEC?
No. They solve different problems. DoT encrypts the DNS query in transit (so no one can see what you're looking up). DNSSEC validates that DNS responses are authentic (haven't been tampered with). They're complementary: DoT protects privacy, DNSSEC protects data integrity.
Test Your DNS over TLS Now
Enter a domain above to query 5 major DoT providers on port 853. Compare TLS versions, cipher suites, and response times. Verify your Android Private DNS is working.
Try DoT Lookup