Self-Hosted DNS Sinkhole: Pi-hole vs AdGuard Home vs Technitium DNS for Malware Blocking

A DNS sinkhole is a DNS server that intercepts queries for known malicious domains and redirects them to a non-routable address (typically 0.0.0.0 or 127.0.0.1), effectively preventing devices on your network from connecting to malware command-and-control servers, phishing sites, and other threats. While most people know DNS filtering tools for ad blocking, their security capabilities — particularly DNS sinkholing for malware protection — are equally important for network security.

This guide compares three popular self-hosted DNS solutions for DNS sinkhole deployment: Pi-hole (the most widely deployed), AdGuard Home (feature-rich with modern UI), and Technitium DNS Server (enterprise-grade with advanced DNS features).

What is a DNS Sinkhole?

A DNS sinkhole works by intercepting DNS queries for domains on a blocklist and returning a null response instead of the real IP address. When a device on your network tries to connect to a malware domain, the DNS server responds with 0.0.0.0, causing the connection to fail silently. This prevents:

• Malware communication: Blocking command-and-control (C2) server connections
• Phishing prevention: Redirecting queries for known phishing domains
• Cryptomining protection: Blocking cryptocurrency mining pool domains
• Ransomware mitigation: Preventing ransomware from contacting its control infrastructure
• Botnet disruption: Cutting off botnet-infected devices from their controllers

Unlike firewalls that operate at the network layer, DNS sinkholes operate at the application layer, catching threats that might bypass traditional network security controls.

Pi-hole

Pi-hole is the most widely known DNS sinkhole solution. Originally designed as a network-wide ad blocker for Raspberry Pi, it has evolved into a comprehensive DNS filtering platform with robust blocklist management and query logging.

Key Features

• Gravity blocklist system: Aggregates multiple blocklists into a single DNS response database
• Regex filtering: Support for regular expression-based domain matching
• Query logging: Real-time and historical DNS query statistics
• Group management: Apply different blocklists to different client groups
• FTL DNS engine: Optimized DNS resolver with caching
• API access: REST API for automation and integration
• Gravity update: Scheduled blocklist updates with automatic merging

Docker Compose Configuration

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version: "3"

services:
  pihole:
    container_name: pihole
    image: pihole/pihole:latest
    ports:
      - "53:53/tcp"
      - "53:53/udp"
      - "80:80/tcp"
      - "443:443/tcp"
    environment:
      TZ: "UTC"
      WEBPASSWORD: "admin-password"
      DNSMASQ_LISTENING: "all"
    volumes:
      - "./etc-pihole:/etc/pihole"
      - "./etc-dnsmasq.d:/etc/dnsmasq.d"
    restart: unless-stopped
    cap_add:
      - NET_ADMIN

Blocklist Configuration

Pi-hole’s Gravity system downloads and merges blocklists from multiple sources:

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# Update blocklists
pihole -g

# Add custom blocklist
pihole -a addst https://example.com/malware-list.txt

# Add regex filter
pihole --regex ".*malware-domain.*"

Security Features

• Default blocklists include malware and phishing domains (StevenBlack unified list)
• Custom blocklist support for threat intelligence feeds
• Query logging for security incident investigation
• Gravity database for efficient domain matching

AdGuard Home

AdGuard Home is a modern, network-wide DNS sinkhole written in Go. It provides a polished web interface, comprehensive filtering capabilities, and excellent performance out of the box.

Key Features

• Modern web UI: Clean, responsive interface with detailed statistics
• DNS-over-HTTPS/TLS/QUIC: Encrypted DNS server support
• Parental control: Built-in safe search and adult content filtering
• Per-client configuration: Different filtering rules per device
• DNS rewrite: Map domains to custom IP addresses (internal DNS)
• Upstream server rotation: Multiple upstream DNS servers with load balancing
• Filter editor: Built-in editor for creating custom filtering rules
• Statistics: Detailed query, client, and top-blocked-domain statistics

Docker Compose Configuration

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version: "3"

services:
  adguard:
    container_name: adguard-home
    image: adguard/adguardhome:latest
    ports:
      - "53:53/tcp"
      - "53:53/udp"
      - "3000:3000/tcp"
      - "80:80/tcp"
    volumes:
      - "./adguard-work:/opt/adguardhome/work"
      - "./adguard-conf:/opt/adguardhome/conf"
    restart: unless-stopped

Blocklist Configuration

AdGuard Home supports multiple filter list formats:

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# filters.yaml - Filter list configuration
- enabled: true
  url: "https://adguardteam.github.io/HostlistsRegistry/assets/filter_1.txt"
  name: "AdGuard DNS filter"
- enabled: true
  url: "https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts"
  name: "StevenBlack Unified"
- enabled: true
  url: "https://malware-filter.gitlab.io/malware-filter/urlhaus-filter-dnscrypt-blocked-ips.txt"
  name: "Malware Domain List"

Security Features

• Pre-configured malware and phishing blocklists
• DNS query encryption (DoH/DoT/DoQ) to prevent DNS spoofing
• Per-client query logging for security forensics
• DNS rewrite rules for internal service mapping
• DNSSEC validation support

Technitium DNS Server

Technitium DNS Server is a comprehensive, enterprise-grade DNS server with built-in ad blocking and malware sinkhole capabilities. Unlike Pi-hole and AdGuard Home, which are primarily filtering tools with DNS resolution, Technitium is a full-featured DNS server with filtering as one of its capabilities.

Key Features

• Full DNS server: Authoritative and recursive DNS resolution
• Built-in blocklists: Integrated ad and malware blocking
• DNS zone management: Create and manage DNS zones directly
• API support: Comprehensive REST API for automation
• Clustering: Multi-node DNS server clustering
• DNS-over-HTTPS/TLS: Encrypted DNS support
• Self-hosted: Runs on Windows, Linux, and Docker
• DHCP server: Integrated DHCP for complete network management

Docker Compose Configuration

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version: "3"

services:
  technitium:
    container_name: technitium-dns
    image: technitium/dns-server:latest
    ports:
      - "53:53/tcp"
      - "53:53/udp"
      - "5380:5380/tcp"
    environment:
      - DNS_SERVER_DOMAIN=dns.local
    volumes:
      - "./dns-config:/etc/dns"
    restart: unless-stopped

Blocklist Configuration

Technitium manages blocklists through its web interface:

1. Navigate to Apps > Block Lists
2. Add blocklist URLs (supports hosts file and domain list formats)
3. Enable/disable individual blocklists
4. Configure update frequency

Security Features

• Enterprise-grade DNS server with filtering
• DNSSEC validation for all queries
• Blocklist management with automatic updates
• Query logging with export capabilities
• DHCP integration for comprehensive network security
• API access for threat intelligence integration

Comparison Table

Choosing the Right DNS Sinkhole

Choose Pi-hole if:

• You want the most widely-used and well-documented DNS sinkhole
• You need regex-based filtering for advanced blocklist patterns
• You have limited hardware (runs well on Raspberry Pi)
• You want a large community for support and troubleshooting
• Your primary focus is ad and malware blocking without complex DNS needs

Choose AdGuard Home if:

• You want a modern, polished web interface with detailed statistics
• You need built-in encrypted DNS (DoH/DoT/DoQ) without additional tools
• You want DNS rewrite capabilities for internal domain mapping
• You need parental control features alongside malware blocking
• You prefer a single binary written in Go with no dependencies

Choose Technitium DNS Server if:

• You need a full-featured DNS server with sinkhole capabilities
• DNS clustering is required for high availability
• You want integrated DHCP alongside DNS and filtering
• You need authoritative DNS for your own domains
• You require an enterprise-grade solution with comprehensive API access

Security Best Practices

1. Use encrypted DNS for upstream queries — Configure DoH or DoT for upstream resolution to prevent ISP-level DNS manipulation
2. Update blocklists regularly — Malware domains change frequently; schedule daily blocklist updates
3. Monitor sinkhole logs — Frequent queries to malware domains may indicate infected devices on your network
4. Combine with other security layers — DNS sinkholes complement but don’t replace firewalls, antivirus, and endpoint detection
5. Protect the DNS server — Restrict administrative access to the web interface; use strong passwords
6. Maintain allowlists — False positives in blocklists can break legitimate services; maintain a reviewed allowlist

FAQ

What is the difference between a DNS sinkhole and a DNS blocklist?

A DNS blocklist is a list of domains to block. A DNS sinkhole is the mechanism that enforces the blocklist — when a query matches a blocked domain, the sinkhole returns a null response (0.0.0.0) instead of the real IP address. All three tools in this comparison function as DNS sinkholes by using blocklists to determine which domains to sinkhole.

Can a DNS sinkhole block all malware?

No. DNS sinkholes only block malware that communicates via domain names. Malware that uses hardcoded IP addresses, encrypted DNS (DoH/DoT to malicious servers), or peer-to-peer communication can bypass DNS sinkholing. DNS sinkholes are one layer of defense — combine them with endpoint protection, firewalls, and regular system updates for comprehensive security.

How often should I update malware blocklists?

Daily updates are recommended for malware-specific blocklists. Threat actors register and abandon domains frequently, so stale blocklists miss new threats while allowing connections to recently compromised domains. Pi-hole and AdGuard Home both support scheduled automatic updates; Technitium allows configurable update frequencies.

Will a DNS sinkhole slow down my network?

No. DNS sinkholes actually improve perceived network performance by blocking requests to ad and malware domains entirely — your browser doesn’t wait for timeouts from blocked domains. All three tools cache DNS responses, so repeated queries are served from cache with sub-millisecond latency.

Can I use multiple DNS sinkholes for redundancy?

Yes. Configure your router’s DHCP to advertise multiple DNS servers (e.g., Pi-hole as primary, AdGuard Home as secondary). If the primary sinkhole goes down, clients fall back to the secondary. Technitium DNS supports native clustering for automatic failover.

How do I detect which device is making malicious DNS queries?

All three tools log queries with client IP addresses. Review your sinkhole logs for blocked domain queries — the source IP identifies the infected device. Pi-hole’s Query Log, AdGuard Home’s Query Log, and Technitium’s DNS logging all show per-client query data.

Why Self-Host Your DNS Sinkhole?

Privacy: Public DNS services (Google DNS, Cloudflare) log your queries. Self-hosted DNS sinkholes keep all DNS resolution within your network, ensuring no third party sees your browsing patterns.

Security Control: Cloud-based DNS filtering services can change their blocklists without notice. Self-hosted solutions give you full control over which blocklists to use, when to update them, and which domains to allow or block.

Network Visibility: Self-hosted DNS sinkholes provide complete visibility into every DNS query on your network. This is invaluable for identifying infected devices, monitoring IoT behavior, and troubleshooting connectivity issues.

Cost: DNS sinkhole tools are free and open-source. Running one on a Raspberry Pi or existing server costs nothing beyond electricity — a significant savings compared to commercial DNS security services.

For DNS server comparisons, see our CoreDNS vs DNSDist vs Knot Resolver guide. For comprehensive DNS filtering, check our Pi-hole vs AdGuard vs Technitium comparison. And for DNS-over-QUIC setup, our Knot Resolver vs AdGuard vs Stubby article covers encrypted DNS protocols.