DoH/DoT Resolver Checker - Verify Secure DNS
Verify whether your DNS resolver supports DNS-over-HTTPS (DoH) and DNS-over-TLS (DoT) protocols. This tool helps you ensure encrypted DNS connections, protect web browsing privacy, and validate secure DNS configuration.
How It Works
The DoH/DoT Checker performs the following steps:
- Enter DNS Resolver Address: Provide the IP address or domain name of the DNS server to check
- Check DoH: The tool sends DNS-over-HTTPS queries over port 443 with TLS encryption
- Check DoT: The tool sends DNS-over-TLS queries over port 853 with TLS connection
- Analyze Results: Display detailed protocol support, response times, and SSL/TLS certificate information
- Generate Report: Provide a summary of the DNS server's security capabilities
Use Cases
- DNS Administrators: Verify DoH/DoT configuration on organizational DNS servers
- ISP Providers: Check secure DNS protocol support for customers
- Security Experts: Assess DNS security and privacy protection capabilities
- Developers: Validate DoH/DoT integration in DNS applications and services
- End Users: Check if ISP or DNS service supports secure DNS protocols
- IT Auditors: Ensure compliance with encrypted DNS policies in organizations
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Technical Explanation
DoH encrypts DNS queries by sending them over HTTPS (port 443). This hides DNS queries from networks and third parties, protecting user privacy. DoH follows RFC 8484 standard.
DNS-over-TLS (DoT)DoT encrypts DNS connections using TLS on dedicated port 853. It provides end-to-end encryption for DNS queries and responses, preventing eavesdropping and DNS tampering. DoT follows RFC 7858 standard.
Why It MattersTraditional DNS over UDP/TCP is unencrypted, allowing web activity tracking. DoH/DoT protects privacy by encrypting DNS queries, preventing ISPs, networks, and third parties from monitoring users' browsing activities.