DNS Encryption Technical Reference
DNS Encryption Technical Reference
A comprehensive technical guide to DNS encryption protocols, Bloqr’s architecture integration, performance analysis, and implementation details for developers and infrastructure teams.
DNS Encryption Protocols
DNS over HTTPS (DoH) - RFC 8484
DoH encapsulates DNS queries as HTTP requests on port 443.
Advantages:
- Firewall-friendly (standard HTTPS port)
- Works through most proxies
- Widely supported
Disadvantages:
- HTTP overhead
- Slightly more latency than DoT
DNS over TLS (DoT) - RFC 7858
DoT wraps DNS in TLS using dedicated port 853.
Advantages:
- Lower overhead than DoH
- Native DNS wire format
- Better for high-volume resolvers
Disadvantages:
- Dedicated port 853 may be blocked
- Less device support than DoH
DNS over QUIC (DoQ) - RFC 9250
DoQ uses QUIC for DNS, combining DoT efficiency with multiplexing.
Advantages:
- 0-RTT resumption
- Full multiplexing support
- Future-proof
Disadvantages:
- Limited device support
- Not yet widely deployed
Performance Characteristics
| Protocol | First Query | Cached Query | Notes |
|---|---|---|---|
| DoH | 50-150ms | 10-30ms | HTTP overhead |
| DoT | 30-80ms | 5-15ms | Lower overhead |
| DoQ | 0-5ms | 5ms | With 0-RTT |
Cloudflare 1.1.1.1
Cloudflare offers encrypted DNS with:
- Zero-query logging policy
- Global anycast network (14ms avg latency)
- Blocks malware by default
- Free for everyone
Related Documentation
- DNS Encryption & Privacy Guide - User-friendly guide
- Client Libraries - Integration examples
- API Reference - Build custom solutions