Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BTLS Certificate Expiry & Recommendations252 days until leaf cert expires — 4 issues to addressREVIEW
Certificate validity
Recommended actions
- Add includeSubDomains to the HSTS directive
- Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
- Enable DNSSEC on your domain for DNS spoofing protection
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
ADNS Records1 A records, 42 ms lookupPASS
| A | 52.149.246.39 |
| AAAA | — |
| CNAME | duckduckgo.com |
| NS | dns1.p05.nsone.net, dns2.p05.nsone.net, dns3.p05.nsone.net, dns4.p05.nsone.net, ns01.quack-dns.com, ns02.quack-dns.com, ns03.quack-dns.com, ns04.quack-dns.com |
| MX | 0 duckduckgo-com.mail.protection.outlook.com |
| TXT | MS=ms71454350 ZOOM_verify_QSjXtfOfRHiY0O9gD5E4Ug SPF v=spf1 include:mailer.duckduckgo.com include:spf.protection.outlook.com include:... OSSRH-87525 bw=IOlfo6xQJX+xewM7+IiPqOSIPtLXKrWoS2RXCTPMmQZc stripe-verification=e508f445dbb94b1ae51f7b48901897714b661f5298da43bb66b224973c82... apple-domain-verification=XeKEoqnRNUfkUc5l openai-domain-verification=dv-OKbsaUeVbNte6OPtWDpdt4Xr cursor-domain-verification-nxwg1m=QRyFwelq3dM8RzBmvRla2boHy anthropic-domain-verification-c7d48c=mGBhXlQHsvOc64IFwZsaKKVoQ mistral-domain-verification=1b914b8749d84fc51987d1cd2b9f86b38617aa4d |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.
Learn more ▾ ▴
Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.
Source: SRE practice / DNS architecture
A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.
CNAME at the apex (example.com) breaks every other apex record (MX, TXT, NS) — DNS-protocol violation per RFC 1034.
Learn more ▾ ▴
RFC 1034 forbids CNAME alongside other records at the same name. Some DNS providers offer ALIAS / ANAME / flattened-CNAME records that work around this — use those instead. Otherwise apex-level CNAME breaks email (no MX), domain ownership verification (no TXT), and more.
Source: RFC 1034
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
ARedirect Chain1 redirect(s), 184 ms totalPASS
https://www.duckduckgo.com
30 ms · HTTP/1.1
https://duckduckgo.com/
154 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://www.duckduckgo.com | 301 | 30 ms | HTTP/1.1 | nginx |
| 2 | https://duckduckgo.com/ | 200 | 154 ms | HTTP/1.1 | nginx |
See the visual redirect chain in the HTTP Probe tab →
A+Crawlabilityrobots.txt present, sitemap with 26 URLsPASS
User-agent: *
Disallow: /lite
Disallow: /html
# No search result pages
Disallow: /*?
# chrome new tab page
Disallow: /chrome_newtab
# Email Protection
Disallow: /email/
Allow: /email/$
Allow: /email/privacy-guarantees
Allow: /email/privacy-terms
# Old Privacy page
Disallow: /2012-privacy-policy
User-agent: ia_archiver
Disallow: /
Sitemap: https://duckduckgo.com/sitemap.xml
ADomain Intelligenceduckduckgo.com — via NameCheap, Inc., 18 years, 8 months old, hosted on Microsoft AzurePASS
EXPIRED
June 23, 2026
252 days
Issued by DigiCert Inc
18 years, 8 months
Registered November 11, 2007
Not enabled
Protects against DNS spoofing
Microsoft Azure
ASN AS8075
52.149.246.39
NameCheap, Inc.
Expiry timeline
Recommended actions
- Domain has EXPIRED — renew immediately to avoid total site outage
- Enable DNSSEC to protect visitors from DNS spoofing
Consider enabling auto-renewal to prevent accidental expiration.
Domain expiry approaching — renew immediately and ensure auto-renew + alerting are configured.
Source: ICANN renewal policy
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.
Learn more ▾ ▴
DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.
Source: ICANN / RFC 4033