# Quad9 alternatives and competitors (2026) The closest Quad9 alternatives are [BlueCat Edge](https://cybersectools.com/tools/bluecat-edge), [DNSSense DNSDome](https://cybersectools.com/tools/dnssense-dnsdome) and [threatER](https://cybersectools.com/tools/threater). Picking a Quad9 alternative comes down to fit: Intrusion Detection and Prevention Systems coverage, your environment, your integrations and your budget. So each option below shows what it covers, how it deploys, its pricing model and the company behind it. 26 alternatives. Closest matches: BlueCat Edge, DNSSense DNSDome, threatER. ## The product [Quad9](https://cybersectools.com/tools/quad9) A free DNS recursive service that blocks malicious host names and protects user privacy. Category: [Network Security](https://cybersectools.com/categories/network-security) · Pricing model: Free ## Quad9 alternatives and competitors Quad9 is a free [Intrusion Detection and Prevention Systems](https://cybersectools.com/categories/idps) solution. The closest matches by shared tags and NIST CSF 2.0 coverage are [BlueCat Edge](https://cybersectools.com/tools/bluecat-edge), [DNSSense DNSDome](https://cybersectools.com/tools/dnssense-dnsdome), [threatER](https://cybersectools.com/tools/threater), [Packet Forensics Network Effects Engine & cQuery](https://cybersectools.com/tools/packet-forensics-network-effects-engine-and-cquery), and [Secure64 DNS Manager](https://cybersectools.com/tools/secure64-dns-manager). All 26 alternatives on this page are ranked the same way. Want a free option? See [free and open source network security solutions](https://cybersectools.com/free), plus free picks in other categories. ## The closest Quad9 alternatives These 8 solutions overlap most with Quad9. Each one says what the product does and, when the overlap is big enough, which capabilities it shares. ### 1. [BlueCat Edge](https://cybersectools.com/tools/bluecat-edge) DNS-layer security solution for threat detection and policy enforcement [Intrusion Detection and Prevention Systems](https://cybersectools.com/categories/idps) · Commercial Key features: 8 listed. See them on the [BlueCat Edge page](https://cybersectools.com/tools/bluecat-edge#features). [BlueCat Edge alternatives](https://cybersectools.com/alternatives/bluecat-edge) · [Quad9 vs BlueCat Edge](https://cybersectools.com/compare/bluecat-edge-vs-quad9) ### 2. [DNSSense DNSDome](https://cybersectools.com/tools/dnssense-dnsdome) AI-based DNS security platform blocking tunneling, malware, and zero-days. [Intrusion Detection and Prevention Systems](https://cybersectools.com/categories/idps) · Commercial Key features: 9 listed. See them on the [DNSSense DNSDome page](https://cybersectools.com/tools/dnssense-dnsdome#features). [DNSSense DNSDome alternatives](https://cybersectools.com/alternatives/dnssense-dnsdome) · [Quad9 vs DNSSense DNSDome](https://cybersectools.com/compare/dnssense-dnsdome-vs-quad9) ### 3. [threatER](https://cybersectools.com/tools/threater) Preemptive threat blocking platform using IP segmentation and DNS security. [Intrusion Detection and Prevention Systems](https://cybersectools.com/categories/idps) · Commercial Key features: 8 listed. See them on the [threatER page](https://cybersectools.com/tools/threater#features). [threatER alternatives](https://cybersectools.com/alternatives/threater) · [Quad9 vs threatER](https://cybersectools.com/compare/quad9-vs-threater) ### 4. [Packet Forensics Network Effects Engine & cQuery](https://cybersectools.com/tools/packet-forensics-network-effects-engine-and-cquery) This page describes two separate Packet Forensics products. Network Effects Engine (NEE) is an inline network defense system built on deep packet inspection. It allows administrators to define policies, using an XML-based policy language, that describe the conditions permitted for traffic entering and leaving a network. The engine can operate on traffic in transit, disarming malicious content at the packet level while allowing legitimate traffic to pass. It can ingest external network intelligence, intrusion detection alerts, or other third-party data sources to inform its policy decisions, in addition to Packet Forensics' own intelligence feeds. cQuery Service is a directory/DNS and WhoIs lookup service designed to prevent disclosure of a client's identity or interests during Internet queries. Normal DNS and WhoIs queries can reveal operating system, software, browsing habits, and correspondents to ISPs, DNS infrastructure operators, or third parties, since these queries are typically unencrypted. cQuery anonymizes these queries, caches large volumes of DNS/WhoIs data to avoid re-querying public infrastructure, automatically determines the correct WhoIs source, applies DNSSEC and cache poisoning defenses, encrypts transactions, and refreshes cached data automatically. It is delivered as a cloud service or as a security-hardened on-premises appliance, with Windows, Mac OS X, and web-based clients, plus an API for C, Perl, and PHP. Key advantages include cached queries to reduce public lookups, anonymization of query traffic, automatic WhoIs source determination, built-in DNSSEC/cache poisoning defense, automatic cache refresh, global pre-caching of top queries, encrypted transactions, and multiple client options. Inline packet-level network defense engine paired with an anonymized DNS/WhoIs lookup service. [Intrusion Detection and Prevention Systems](https://cybersectools.com/categories/idps) · Commercial Key features: 10 listed. See them on the [Packet Forensics Network Effects Engine & cQuery page](https://cybersectools.com/tools/packet-forensics-network-effects-engine-and-cquery#features). [Packet Forensics Network Effects Engine & cQuery alternatives](https://cybersectools.com/alternatives/packet-forensics-network-effects-engine-and-cquery) · [Quad9 vs Packet Forensics Network Effects Engine & cQuery](https://cybersectools.com/compare/packet-forensics-network-effects-engine-and-cquery-vs-quad9) ### 5. [Secure64 DNS Manager](https://cybersectools.com/tools/secure64-dns-manager) Centralized management platform for administering DNS server infrastructure. [Intrusion Detection and Prevention Systems](https://cybersectools.com/categories/idps) · Commercial Key features: 4 listed. See them on the [Secure64 DNS Manager page](https://cybersectools.com/tools/secure64-dns-manager#features). [Secure64 DNS Manager alternatives](https://cybersectools.com/alternatives/secure64-dns-manager) · [Quad9 vs Secure64 DNS Manager](https://cybersectools.com/compare/quad9-vs-secure64-dns-manager) ### 6. [Trellix Intrusion Prevention System](https://cybersectools.com/tools/trellix-intrusion-prevention-system) Next-gen IPS detecting & blocking network threats via signatures & behavior [Intrusion Detection and Prevention Systems](https://cybersectools.com/categories/idps) · Commercial Key features: 10 listed. See them on the [Trellix Intrusion Prevention System page](https://cybersectools.com/tools/trellix-intrusion-prevention-system#features). [Trellix Intrusion Prevention System alternatives](https://cybersectools.com/alternatives/trellix-intrusion-prevention-system) · [Quad9 vs Trellix Intrusion Prevention System](https://cybersectools.com/compare/quad9-vs-trellix-intrusion-prevention-system) ### 7. [Palo Alto Networks Advanced Threat Prevention](https://cybersectools.com/tools/palo-alto-networks-advanced-threat-prevention) IPS with inline AI models to block zero-day exploits and C2 attacks in real time [Intrusion Detection and Prevention Systems](https://cybersectools.com/categories/idps) · Commercial Key features: 10 listed. See them on the [Palo Alto Networks Advanced Threat Prevention page](https://cybersectools.com/tools/palo-alto-networks-advanced-threat-prevention#features). [Palo Alto Networks Advanced Threat Prevention alternatives](https://cybersectools.com/alternatives/palo-alto-networks-advanced-threat-prevention) · [Quad9 vs Palo Alto Networks Advanced Threat Prevention](https://cybersectools.com/compare/palo-alto-networks-advanced-threat-prevention-vs-quad9) ### 8. [Snort Open Source](https://cybersectools.com/tools/snort-open-source) Snort is an open-source network intrusion detection and prevention system that analyzes traffic in real-time to identify and block malicious activity using rule-based detection methods. [Intrusion Detection and Prevention Systems](https://cybersectools.com/categories/idps) · Commercial [Snort Open Source alternatives](https://cybersectools.com/alternatives/snort-open-source) · [Quad9 vs Snort Open Source](https://cybersectools.com/compare/quad9-vs-snort-open-source) ## All 26 products like Quad9 The 8 above, plus: - [ThreatSTOP Protective DNS](https://cybersectools.com/tools/threatstop-platform): DNS-layer threat blocking service with real-time threat intelligence feeds (Commercial) - [Infoblox Threat Defense](https://cybersectools.com/tools/infoblox-threat-defense): DNS-based threat defense using predictive intelligence to block threats (Commercial) - [Trend Micro TippingPoint Threat Protection System](https://cybersectools.com/tools/trend-micro-tippingpoint-threat-protection-system): Inline network detection and response system with IPS capabilities (Commercial) - [Cybermerc Aushield Protect](https://cybersectools.com/tools/cybermerc-aushield-protect): Network security solution for SMBs with behavioral intrusion detection (Commercial) - [OpenText Core DNS Protection](https://cybersectools.com/tools/opentext-core-dns-protection): Cloud-native DNS filtering solution that blocks malicious domains and threats (Commercial) - [ScoutDNS Threat Protection](https://cybersectools.com/tools/scoutdns-threat-protection): DNS-layer threat protection blocking malware, phishing, and DNS attacks (Commercial) - [Axiom Cyber HakTrap](https://cybersectools.com/tools/axiom-cyber-haktrap): Hardware network security device for home/SMB with continuous threat updates. (Commercial) - [Centripetal CleanINTERNET®](https://cybersectools.com/tools/centripetal-cleaninternetr): Real-time network threat prevention platform enforcing 10B+ threat indicators. (Commercial) - [Digital Arts Inc.](https://cybersectools.com/tools/digital-arts-inc): Japanese cybersecurity firm offering web/email filtering & data loss prevention. (Commercial) - [Whalebone](https://cybersectools.com/tools/whalebone): DNS-based cybersecurity platform for telcos, ISPs, enterprises & govts. (Commercial) - [Wireless Airspace Cybersecurity Platform](https://cybersectools.com/tools/bastille-networks): AI-driven RF monitoring platform for wireless device detection & threat mgmt. (Commercial) - [DYNANIC](https://cybersectools.com/tools/dynanic): FPGA-based SmartNIC solution for lossless packet processing up to 400 Gbps. (Commercial) - [Backbox Network Cyber Resilience Platform](https://cybersectools.com/tools/backbox-network-cyber-resilience-platform): Network infrastructure automation platform for cyber resilience tasks (Commercial) - [Akheros](https://cybersectools.com/tools/akheros): Anomaly-based IDS using relative incongruity scoring to reduce false positives. (Commercial) - [Guardian360 Hacker Alert](https://cybersectools.com/tools/guardian360-hacker-alert): 24/7 network intrusion detection with immediate alert notifications. (Commercial) - [Intrusion Shield](https://cybersectools.com/tools/intrusion-shield): Network threat protection platform blocking malicious IPs using reputation intelligence. (Commercial) - [Allumetis](https://cybersectools.com/tools/allumetis): Automated brute-force detection & blocking for on-prem Exchange Server. (Commercial) - [IDappcom TrafficIQ Professional](https://cybersectools.com/tools/idappcom-trafficiq-professional): Windows platform for auditing network security defences via custom PCAP replay. (Commercial) ## Alternatives to each of these [BlueCat Edge alternatives](https://cybersectools.com/alternatives/bluecat-edge) · [DNSSense DNSDome alternatives](https://cybersectools.com/alternatives/dnssense-dnsdome) · [threatER alternatives](https://cybersectools.com/alternatives/threater) · [Packet Forensics Network Effects Engine & cQuery alternatives](https://cybersectools.com/alternatives/packet-forensics-network-effects-engine-and-cquery) · [Secure64 DNS Manager alternatives](https://cybersectools.com/alternatives/secure64-dns-manager) · [Trellix Intrusion Prevention System alternatives](https://cybersectools.com/alternatives/trellix-intrusion-prevention-system) · [Palo Alto Networks Advanced Threat Prevention alternatives](https://cybersectools.com/alternatives/palo-alto-networks-advanced-threat-prevention) · [Snort Open Source alternatives](https://cybersectools.com/alternatives/snort-open-source) · [ThreatSTOP Protective DNS alternatives](https://cybersectools.com/alternatives/threatstop-platform) · [Infoblox Threat Defense alternatives](https://cybersectools.com/alternatives/infoblox-threat-defense) · [Trend Micro TippingPoint Threat Protection System alternatives](https://cybersectools.com/alternatives/trend-micro-tippingpoint-threat-protection-system) · [Cybermerc Aushield Protect alternatives](https://cybersectools.com/alternatives/cybermerc-aushield-protect) ## Compare Quad9 with - [Quad9 vs BlueCat Edge](https://cybersectools.com/compare/bluecat-edge-vs-quad9) - [Quad9 vs DNSSense DNSDome](https://cybersectools.com/compare/dnssense-dnsdome-vs-quad9) - [Quad9 vs threatER](https://cybersectools.com/compare/quad9-vs-threater) - [Quad9 vs Packet Forensics Network Effects Engine & cQuery](https://cybersectools.com/compare/packet-forensics-network-effects-engine-and-cquery-vs-quad9) - [Quad9 vs Secure64 DNS Manager](https://cybersectools.com/compare/quad9-vs-secure64-dns-manager) - [Quad9 vs Trellix Intrusion Prevention System](https://cybersectools.com/compare/quad9-vs-trellix-intrusion-prevention-system) - [Quad9 vs Palo Alto Networks Advanced Threat Prevention](https://cybersectools.com/compare/palo-alto-networks-advanced-threat-prevention-vs-quad9) - [Quad9 vs Snort Open Source](https://cybersectools.com/compare/quad9-vs-snort-open-source) ## Quad9 Alternatives FAQ ### What are the closest alternatives to Quad9? The closest matches to Quad9 by shared tags and NIST CSF 2.0 coverage are BlueCat Edge, DNSSense DNSDome, threatER, Packet Forensics Network Effects Engine & cQuery, and Secure64 DNS Manager. All of them are Intrusion Detection and Prevention Systems products. ### How many alternatives to Quad9 are available? This page shows 26 alternatives to Quad9, all in the Intrusion Detection and Prevention Systems category. Each one is matched on shared tags and NIST CSF 2.0 areas, and the closest matches rank first. ### Is Quad9 free or commercial? Quad9 is a free Intrusion Detection and Prevention Systems product. You can use it at no cost. Only commercial alternatives are listed here. Free and open source products are under /free. ### What type of solution is Quad9? Quad9 is a Intrusion Detection and Prevention Systems product in the Network Security category. You can compare it with the 26 other Intrusion Detection and Prevention Systems products on this page. --- Source: https://cybersectools.com/alternatives/quad9 For AI agents: every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md, and any product or compare page has a Markdown copy too (add .md to its URL). More on Quad9 and its alternatives: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=alternatives-md