Quad9 Review: Is It Right for a Home Office or Small Business?
Free malware and phishing blocking from a Swiss nonprofit — no account, no dashboard, no catch.
By John Hall — TechODash | Last updated: July 2026
Quick Verdict
What kind of tool this is, up front: Quad9 is a free, cloud-hosted public DNS resolver — you point your router or devices at it (9.9.9.9), and it blocks lookups for known-malicious domains. There's no dashboard, no account, and no paid tier. If you want content filtering, per-device logs, or custom rules, see our NextDNS review instead — Quad9 deliberately does none of that.
Quad9 is not a product you buy. It's a public recursive DNS resolver you point your router or devices at, and it quietly blocks lookups for domains known to host malware, phishing, and command-and-control infrastructure. For most small networks, it's the single easiest security improvement available, and it costs nothing. Quad9 is operated by a Swiss public-benefit not-for-profit foundation and funded by donations and sponsors — no paid tier, no account, no subscription.
Why This Product Matters
Every time a device on your network opens a website, checks email, or phones home to an app, it first asks a DNS resolver to translate a name like example.com into an IP address. By default, that resolver belongs to your internet provider, and it answers everything, including requests to domains a security team already knows are malicious. Quad9 sits in that same spot but adds a filter — when a device asks for a domain that appears on Quad9's threat intelligence feeds, Quad9 returns "not found" instead of the real address, and the connection never gets made. This matters in a SOHO setting because DNS filtering is the one control that covers your entire network without installing anything on individual machines. A guest laptop, a smart TV, a printer, a contractor's phone on your Wi-Fi — all of them use DNS. Change one setting on the router and every device inherits the protection. That's unusual leverage for a network with no IT staff. The governance angle is worth understanding too: Quad9 is a Swiss foundation that states it does not collect or store user IP addresses and has defended that position in court — in December 2023 the Higher Regional Court in Dresden ruled in Quad9's favor against Sony Music, finding that a DNS resolver is a neutral intermediary rather than a party liable for the content it resolves.
Who It's Best For
- Home offices and solo professionals who want baseline malware and phishing protection without adding a subscription or an agent on every machine
- Remote workers on personal hardware who want an easy win that doesn't conflict with a company VPN
- Families who want threat blocking without a content-filtering dashboard, tracking, or parental-control complexity
- Small businesses of 2 to 20 people looking for a free, low-maintenance layer on top of endpoint antivirus
- Privacy-conscious users who are uncomfortable with resolvers operated by advertising or telecom companies
- Nonprofits, clinics, and small practices that need to reduce phishing exposure on a zero-dollar budget
Who Should Skip It
- Anyone who needs content filtering — Quad9 blocks malicious domains only, not adult content, social media, gambling, or streaming; look at NextDNS, Control D, or Cloudflare's 1.1.1.3 instead
- Anyone who needs per-device reporting — there's no dashboard, no query log, and no per-client analytics, by design
- Anyone who needs allowlist or blocklist control — you cannot add custom rules; your only recourse for a disputed block is submitting it for review
- Regulated environments that must produce DNS logs for a compliance audit trail
- Anyone already running a mature filtering platform like DNSFilter, Cisco Umbrella, or a well-tuned Pi-hole with upstream filtering — Quad9 adds little on top
- Anyone whose ISP router locks DNS settings and doesn't allow custom resolvers
Key Features That Matter
Threat-based domain blocking: Quad9 aggregates feeds from a range of commercial and nonprofit threat intelligence partners rather than relying on a single list, and publishes its partner list plus a lookup tool identifying the source of any block. Three service tiers, no account needed: the standard endpoint 9.9.9.9 gives you malware blocking plus DNSSEC; 9.9.9.11 adds EDNS Client Subnet, useful if you notice slow downloads or video buffering; 9.9.9.10 disables blocking entirely and is labeled for experts only. Encrypted DNS on every tier: DoH and DoT endpoints exist for all three service options, and DNSCrypt is supported — modern routers, Windows 11, macOS, iOS, and Android can all use these natively. DNSSEC validation on by default: protects against certain classes of DNS spoofing and cache poisoning. No logging of user IP addresses: Quad9's policy states the reply-to address is held in volatile memory for microseconds to milliseconds and then discarded, with only aggregate counters collected. Stated refusal of censorship requests: the policy explicitly says Quad9 will not cooperate with mandatory attribution requiring PII-linked query storage. Broad anycast footprint: Quad9 runs points of presence worldwide through its infrastructure partnership with Packet Clearing House, so your queries generally hit a nearby node rather than crossing an ocean.
Performance and Reliability
Independent benchmarking from DNSPerf's global probes places Quad9's median global latency at roughly 22ms, compared with roughly 11ms for Cloudflare and 18ms for Google, with OpenDNS around 24ms and AdGuard around 27ms. Here's what that actually means for you: a 10ms difference in DNS lookup time is not something a person perceives while browsing. Page load time is dominated by TLS handshakes, JavaScript execution, and image weight, not by the name lookup that precedes them — and your browser and OS cache DNS results aggressively, so most page loads involve no resolver query at all. Where a resolver change genuinely helps is if your ISP's DNS is unreliable — slow to respond under load, prone to timeouts, or configured to hijack failed lookups and serve you a search page. Replacing that with a competent anycast resolver removes a real source of intermittent "the internet is broken" moments. On reliability, Quad9's anycast network has a good operational track record and the service has been running publicly since 2017 — though it's worth acknowledging the structural reality that it's a nonprofit funded by donations, not a business unit inside a hyperscaler. That independence is precisely why some people choose it, and it's also a reason to have a fallback resolver written down. One practical note on daily use: when Quad9 blocks a domain, the browser typically shows a generic "site can't be reached" error rather than a clear "this was blocked for security" page — worth telling anyone on your network that DNS filtering is active, so a blocked page prompts a question rather than an hour of troubleshooting.
Security Review
What it genuinely protects against: the strongest case for Quad9 is phishing and drive-by malware. When someone on your network clicks a link in a convincing invoice email, the malicious domain often fails to resolve before the browser ever loads a page. The same applies to malware that has already landed on a machine and is trying to reach its command-and-control server — DNS blocking can cut that channel. For a small business, where credential phishing is the most common real-world attack, this is a well-matched control. DNSSEC validation adds protection against forged DNS responses, and encrypted transport prevents observation and manipulation of your lookups on hostile networks. What it does not protect against — be clear-eyed here, because DNS filtering is frequently oversold: it does not stop threats delivered over an IP address with no domain lookup; it does not stop malicious attachments, macro documents, or anything already executing locally; it does not inspect content, so a phishing page on a newly registered domain that no feed has flagged will resolve normally; it does not stop an attacker who's already inside a device from using their own hardcoded resolver; and it offers no protection once a device leaves your network unless you configure encrypted DNS on the device itself. Honest limitations of the blocking model: threat feeds are reactive — there's a window between a malicious domain going live and appearing on a feed, and fast-moving phishing campaigns exploit exactly that window. False positives also happen — a legitimate site on shared hosting can inherit a bad neighbor's reputation, and while Quad9's lookup tool lets you check why something was blocked, you cannot override it yourself. Privacy assessment: Quad9's privacy posture is among the strongest available from a public resolver, and its Swiss foundation structure plus the Dresden ruling give it more independence than most. That said, "no logs" is a policy claim backed by published documentation and RFC 8932 alignment rather than something you can independently verify from the outside. Quad9 does share limited statistical counters about queries to identified malicious domains with threat intelligence analysts, which is disclosed in the policy.
First Settings I Would Change
- Set Quad9 at the router, not on each device — enter 9.9.9.9 as primary and 149.112.112.112 as secondary in your router's DNS settings; add 2620:fe::fe and 2620:fe::9 if your router supports IPv6. This covers every device on the network in one change.
- Remove your ISP's DNS from the fallback slots — many routers keep the provider's resolvers as backups, and if those remain, some queries will bypass Quad9 entirely.
- Turn on DNS-over-TLS or DNS-over-HTTPS if your router supports it — use tls://dns.quad9.net for DoT or https://dns.quad9.net/dns-query for DoH, which encrypts DNS between your network and Quad9 so your ISP cannot read or modify it.
- Verify it's actually working — visit Quad9's test page or run a lookup for a known-blocked test domain; it's common for a router setting to look saved and not actually apply until reboot.
- Configure laptops that leave the building separately — router-level DNS only protects devices at home, so set encrypted DNS in the OS using dns.quad9.net as the hostname so protection travels with the device.
- Set a fallback plan before you need one — write down 1.1.1.1 and 8.8.8.8 somewhere accessible, in case a resolver has an outage or blocks a domain you urgently need.
- Consider 9.9.9.11 if you see slow content delivery — the ECS-enabled endpoint helps CDNs route you to a nearer server.
- Block outbound DNS on port 53 from other devices, if your router allows it and you're comfortable with firewall rules — some smart TVs and IoT devices hardcode Google DNS and ignore your router entirely.
Setup Difficulty
Rating: Beginner — at its simplest, this is typing two numbers into your router and saving. Most people finish in under ten minutes, and there's nothing to install, no account to create, and no license key. The only place it edges toward intermediate is if you want encrypted DNS on a router that doesn't support it out of the box, or if you take on the port 53 firewall rule — neither is required to get the core benefit.
Pros
- Genuinely free with no account, no subscription, no upsell path, and no usage cap
- Blocks malware, phishing, and C2 domains using aggregated feeds from multiple threat intelligence partners
- Among the strongest published privacy policies of any public resolver, with no user IP retention and no account system
- Swiss not-for-profit foundation structure, with a court win in Dresden establishing DNS resolvers as neutral intermediaries
- Supports DoH, DoT, DNSCrypt, and DNSSEC across all service tiers
- One router change protects every device on the network, including ones you cannot install software on
- Zero ongoing maintenance — no firmware to patch, no agent to update, no renewal date
- Stated refusal to honor government censorship requests
Cons
- No content filtering at all — no adult, social, gaming, or productivity categories
- No dashboard, no query logs, no per-device visibility, and no reporting for compliance purposes
- No custom allowlist or blocklist — you cannot override a block yourself
- Blocked domains surface as generic browser errors, which confuses non-technical users
- Slightly higher median latency than Cloudflare or Google in global benchmarks
- Threat feeds are reactive, so brand-new phishing domains can slip through
- Router-level setup does not protect laptops and phones once they leave your network
- No commercial support contract or SLA if something goes wrong
Best Alternatives
| Alternative | Why Consider It |
|---|---|
| Cloudflare 1.1.1.1 for Families | Households wanting basic adult-content blocking and the lowest latency (~11ms median) — two fixed presets, free |
| NextDNS | Users wanting granular control, categories, and visibility at a very low price — full logs and analytics (free up to 300k queries/mo; Pro $19.90/yr) |
| Control D | Small businesses wanting per-endpoint management and MSP-style controls — real-time analytics dashboard (free tier; $30/yr personal, $2/endpoint/mo SMB) |
| OpenDNS Home Free (Cisco) | Families comfortable with Cisco's ecosystem wanting simple category blocking — basic stats with a free account |
Final Verdict: Strong Buy for the Right User
Quad9 earns that rating because it does one thing well, costs nothing, takes ten minutes, and asks nothing of you afterward. For a home office or a small business without dedicated IT, it closes a real gap — the phishing link that arrives on a Tuesday afternoon — using threat intelligence that would otherwise be out of reach at this price. The privacy architecture and the foundation's demonstrated willingness to defend it in court make it a resolver you can recommend without caveats about data handling. The rating stops short of a perfect score for honest reasons: there's no visibility, no customization, and no support contract. If a domain you need gets blocked, you wait or you switch. If you want more control, visibility, or content filtering, NextDNS or Control D are better fits and cost very little. But if the question is "what's the best free security improvement I can make to my network this afternoon," Quad9 is a defensible answer for most SOHO users.
FAQ
Does Quad9 slow down my internet?
In practice, no — not in a way you'll notice. Independent benchmarks show Quad9's median global latency around 22ms versus roughly 11ms for Cloudflare, but DNS lookup time is a small fraction of total page load, and results are cached locally.
Is Quad9 really free, and what's the catch?
It's genuinely free with no paid tier and no account. Quad9 is a Swiss public-benefit not-for-profit foundation funded by donations and sponsors. The tradeoff isn't hidden cost — it's the absence of features: no dashboard, no custom rules, no content categories, and no support contract.
Will Quad9 block adult content or social media for my kids?
No. Quad9 blocks only domains flagged as malicious by its threat intelligence feeds. For content categories, use Cloudflare's 1.1.1.3 for a free adult-content preset, or NextDNS/Control D for granular category and per-device controls.
Does Quad9 replace my antivirus?
No. Quad9 stops connections to known-bad domains, which helps against phishing and malware callbacks. It does nothing about malicious attachments, software already running on a machine, threats reached directly by IP address, or weak passwords.
What happens to devices when they leave my home network?
If you configured Quad9 only on the router, those devices revert to whatever DNS the new network hands them — no protection. Configure encrypted DNS in the operating system using dns.quad9.net to keep protection with any laptop or phone that regularly works from cafés, coworking spaces, or client sites.
Where to Go From Here
Want the full picture on securing your home office network? SOHO 2026 covers it end to end.
Get SOHO 2026 →This review is part of the TechODash SOHO Reviews series, built for home offices, remote workers, creators, and small businesses that want practical protection without enterprise complexity.