DNS resolver registry · Quad9

Quad9 DNS servers

Quad9 offers 3 service variants with different filtering, reachable over DNS (53), DoT, DoH. Every address and endpoint below is taken from the operator's documentation; the behaviour is what we measured on 2026-09-24.
9.9.9.9
primary address
12
addresses in 3 variants
Validates
DNSSEC in our test
Some addresses send /24
client subnet (ECS)
Addresses Check your resolver

Addresses

Quad9 DNS addresses by variant

Set the IPv4 or IPv6 addresses as your DNS servers, or use an encrypted endpoint where one is listed.

Quad9 (recommended)

Malware blocking

IPv4
9.9.9.9
149.112.112.112
IPv6
2620:fe::fe
2620:fe::9
DoH
https://dns.quad9.net/dns-query
DoT
dns.quad9.net

Quad9 secured with ECS

Malware blocking

IPv4
9.9.9.11
149.112.112.11
IPv6
2620:fe::11
2620:fe::fe:11
DoH
https://dns11.quad9.net/dns-query
DoT
dns11.quad9.net

Quad9 unsecured

None

IPv4
9.9.9.10
149.112.112.10
IPv6
2620:fe::10
2620:fe::fe:10
DoH
https://dns10.quad9.net/dns-query
DoT
dns10.quad9.net

Measured

What we observed

Measured 2026-09-24 from one vantage point, three rounds per address, majority result. Anycast resolvers can behave differently from other networks. How we test

DNSSEC validation Validates

Returned SERVFAIL for dnssec-failed.org, rhybar.cz and badsig.go.dnscheck.tools on every address that answered, while resolving example.com.

Client subnet (ECS)

Some addresses send /24. The authoritative server received that much of the client address, enough to locate a user to a block of addresses.

Plain DNS and NXDOMAIN

6/6 documented IPv4 addresses answered on port 53. Random non-existent names came back as NXDOMAIN, so errors are not rewritten into ads or search pages.

Encrypted endpoints

  • DoH https://dns.quad9.net/dns-queryAnswered
  • DoH https://dns11.quad9.net/dns-queryAnswered
  • DoH https://dns10.quad9.net/dns-queryAnswered
  • DoT dns.quad9.netAnswered
  • DoT dns11.quad9.netAnswered
  • DoT dns10.quad9.netAnswered

Networks

Which networks carry it

The announcing network comes from RIPEstat routing data for each documented address. The query network is where the resolver sent its own lookups during our probe, which a DNS leak test reports.

Announcing the service addresses

  • AS19281 QUAD9-AS-1 - Quad9

Queried from, in our probe

Not published: the lookup did not return, or the network describes our vantage point rather than the resolver.

In the operator's words

Operator statements

Quoted from the operator's pages and checked word for word. We have not audited these practices.
“Quad9 c/o SWITCH Werdstrasse 2 8004 Zürich Switzerland”
quad9.net
“DNSSEC validation is enabled on all resolver addresses.”
quad9.net
“Quad9 does not collect or record user IP addresses, nor does it collect or hold any proxy for or representation of user IP addresses”
quad9.net

Check it

Confirm your device is using Quad9

Changing a DNS setting does not guarantee your lookups reach that resolver: a VPN, a browser's own secure DNS or a proxy can send them elsewhere. Our DNS leak test shows which resolvers actually received your queries.

From a terminal

# Which address did the resolver query from?
dig +short whoami.akamai.net @9.9.9.9

# Does it pass your subnet on (ECS)?
dig +short TXT o-o.myaddr.l.google.com @9.9.9.9

# Does it validate DNSSEC? SERVFAIL means yes
dig dnssec-failed.org @9.9.9.9

Behind a proxy

With an HTTP proxy, or a client set to socks5h://, the proxy side resolves hostnames, so your own resolver setting does not apply to that traffic. With socks5:// in curl or Python requests, your device resolves names first. The SOCKS5 vs SOCKS5h guide shows how to check which one you have.

Questions

Quad9 questions

What are Quad9's DNS server addresses?

Quad9 (recommended): 9.9.9.9, 149.112.112.112, 2620:fe::fe, 2620:fe::9. Quad9 secured with ECS: 9.9.9.11, 149.112.112.11, 2620:fe::11, 2620:fe::fe:11. Quad9 unsecured: 9.9.9.10, 149.112.112.10, 2620:fe::10, 2620:fe::fe:10.

Does Quad9 validate DNSSEC?

Yes. On 2026-09-24 every Quad9 address that answered returned SERVFAIL for three deliberately mis-signed domains while resolving ordinary names.

Does Quad9 support DNS over HTTPS or DNS over TLS?

DoH: https://dns.quad9.net/dns-query, https://dns11.quad9.net/dns-query, https://dns10.quad9.net/dns-query. DoT: dns.quad9.net, dns11.quad9.net, dns10.quad9.net. 6 of 6 answered our test query on 2026-09-24.

Does Quad9 send my IP subnet to other servers (ECS)?

Yes on at least one address: we observed a /24 client subnet reaching the authoritative server.

How can I check that I am using Quad9?

Run a DNS leak test and compare the network it reports. On the command line, dig +short whoami.akamai.net @9.9.9.9 returns the address the resolver used to query Akamai.

Sources

Sources and dates

Documentation checked 2026-09-24. Measured 2026-09-24. Registry reviewed 2026-09-24.

Compare

Other resolvers where DNSSEC validates

Cloudflare 1.1.1.1

1.1.1.1 · 1.0.0.1

DNSSEC: validates

Google Public DNS

8.8.8.8 · 8.8.4.4

DNSSEC: validates

OpenDNS

208.67.222.222 · 208.67.220.220

DNSSEC: validates

AdGuard DNS

94.140.14.14 · 94.140.15.15

DNSSEC: validates

CleanBrowsing

185.228.168.9 · 185.228.169.9

DNSSEC: validates

Control D Free DNS

76.76.2.0 · 76.76.10.0

DNSSEC: validates
All 20 resolvers

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