Location
Dulles, United States
Within about 20 km
Domain
duckduckgo.com
Hosted on GitHub Actions runners.
Still looking this up. This tab fills in as the answers arrive.
Network Every network on the internet has an autonomous system number (ASN). This is the one that announces this address.
AS8075Microsoft
GitHub · Actions runners
BGP prefixPrefix The block of addresses this IP is announced in to the rest of the internet. RPKI valid means the block's owner signed off on the network announcing it.
RPKI valid52.148.0.0/14
Seen by 3,201 peers
Latency Round trip for an HTTPS request from your browser to the site and back, including the server's reply time.
Live— ms
Measuring from your browser…
At a glance
Route
Finding a probe near you…
Networks crossed
Each network is an autonomous system (AS). Your traffic is handed from one to the next where they connect, following
the routes BGP advertises.
- AS16509Anthropic, PBC
- AS8075Microsoft
Tracing from a probe near you with Globalping. Hop locations that its round-trip times rule out are left off the map.
Protected from spoofing
Mail that fails its checks is rejected under duckduckgo.com's DMARC policy, so forged mail doesn't reach inboxes.
- Receives mail
- Microsoft 365
- Mail servers
- duckduckgo-com.mail.protection.outlook.com
- SPFLists the servers allowed to send mail for the domain. Receivers check it against the sending server.
- Rejects everything else8 of 10 DNS lookups · includes mail.duckduckgo.com, spf.mailer.duckduckgo.com…
- DMARCTells receivers what to do with mail that fails SPF and DKIM: nothing (none), spam folder (quarantine) or reject.
- Rejectsends reports
- MTA-STSRequires other mail servers to use encrypted connections (TLS) when delivering to this domain.
- Not published
- TLS reportsAsks other mail servers to report failed encrypted deliveries (TLS-RPT).
- Requested
- BIMIA brand logo that some mail apps show next to authenticated mail from the domain.
- Not published
DNS records
TypeNameValueTTL
Aduckduckgo.com52.149.246.392 min
NSduckduckgo.comdns1.p05.nsone.net1 day
NSduckduckgo.comdns2.p05.nsone.net1 day
NSduckduckgo.comdns3.p05.nsone.net1 day
NSduckduckgo.comdns4.p05.nsone.net1 day
NSduckduckgo.comns01.quack-dns.com1 day
NSduckduckgo.comns02.quack-dns.com1 day
NSduckduckgo.comns03.quack-dns.com1 day
NSduckduckgo.comns04.quack-dns.com1 day
MXduckduckgo.com0 duckduckgo-com.mail.protection.outlook.com1 hr
TXTduckduckgo.com"MS=ms71454350"1 hr
TXTduckduckgo.com"ZOOM_verify_QSjXtfOfRHiY0O9gD5E4Ug"1 hr
TXTduckduckgo.com"v=spf1 include:mail.duckduckgo.com include:spf.mailer.duckduckgo.com include:spf.protection.outlook.com include:duck.com include:mail.zendesk.com -all"1 hr
TXTduckduckgo.com"OSSRH-87525"1 hr
TXTduckduckgo.com"bw=IOlfo6xQJX+xewM7+IiPqOSIPtLXKrWoS2RXCTPMmQZc"1 hr
TXTduckduckgo.com"stripe-verification=e508f445dbb94b1ae51f7b48901897714b661f5298da43bb66b224973c8290d4"1 hr
TXTduckduckgo.com"apple-domain-verification=XeKEoqnRNUfkUc5l"1 hr
TXTduckduckgo.com"openai-domain-verification=dv-OKbsaUeVbNte6OPtWDpdt4Xr"1 hr
TXTduckduckgo.com"cursor-domain-verification-nxwg1m=QRyFwelq3dM8RzBmvRla2boHy"1 hr
TXTduckduckgo.com"anthropic-domain-verification-c7d48c=mGBhXlQHsvOc64IFwZsaKKVoQ"1 hr
TXTduckduckgo.com"mistral-domain-verification=1b914b8749d84fc51987d1cd2b9f86b38617aa4d"1 hr
TXTduckduckgo.com"slack-domain-verification=oDt8KTPHJdkpcJOZ6J8W8cyJLsEfrJULCQiQ1YbP"1 hr
TXTduckduckgo.com"bitrise-verification=c11237685d624d93-X607LcWjwOdP"1 hr
TXT_dmarc.duckduckgo.com"v=DMARC1; p=reject; pct=100; rua=mailto:n1um42s6@ag.dmarcian.com"1 hr
CAAduckduckgo.com0 issue "digicert.com"1 hr
CAAduckduckgo.com0 issue "letsencrypt.org"1 hr
Exposure
Open ports
2 open- 80HTTP
- 443HTTPS
- Software
- nginx
- Tags
- Cloud
- Seen asHostnames Shodan has seen pointing at, or presented by, this address.
- use-ip-1.duckduckgo.comduckduckgo.comalm.hk
From Shodan InternetDB, updated weekly.
HTTPS
Certificate
Valid- Issuer
- DigiCert
- Issuing CA
- DigiCert Global G2 TLS RSA SHA256 2020 CA1
- Covers
- *.duckduckgo.com, duckduckgo.com
- Also validOther unexpired certificates for this name, found in Certificate Transparency logs.
- 2 more certificates
May 5, 202639 days leftNov 19, 2026
From Certificate Transparency logs, via Cert Spotter.
Security
A+- HSTSStrict-Transport-Security makes browsers refuse plain HTTP to this site. Preloaded sites are HTTPS-only even on a first visit.
- 1 year
- HTTP → HTTPSWhether the plain http:// address redirects visitors to the secure one.
- Doesn't redirect
- HTTP/3The newest HTTP, over QUIC. Announced in the alt-svc header or the domain's HTTPS DNS record.
- Not announced
- CAADNS records naming the only certificate authorities allowed to issue certificates for the domain.
- DigiCert, Let's Encrypt
- security.txtA standard file (RFC 9116) telling security researchers how to report vulnerabilities.
- Not published
Security headers 6 of 7
- HSTSpresent
- CSPpresent
- Framingpresent
- No sniffingpresent
- Referrerpresent
- Permissionspresent
- Isolationmissing
Response
200 OK113 ms from CMH · 54.0 KBDNS lookup2 ms
200 duckduckgo.com113 ms
DNSConnect (TCP + TLS)Waiting for the replyFrom Cloudflare's CMH data center
Website
Page
DuckDuckGo - Protection. Privacy. Peace of mind.
The Internet privacy company that empowers you to seamlessly take control of your personal information online, without any tradeoffs.
- Language
- American English
Built with
- CloudFrom the provider's published address ranges.
- GitHub · Actions runners
- Framework
- Next.jspage markup
- Server
- nginxserver header “nginx”
Tech stack
Built with Each entry says what gave it away: a response header, a cookie's name, an asset's path or file name, or markup the tool leaves in the page. Versions are checked against endoflife.date's support schedules and, for JavaScript packages, OSV's vulnerability database, which carries GitHub's security advisories.
Hosting
- GitHub · Actions runners
GitHub address range
Server
- nginx
server header “nginx”
Framework
- Next.jsPages Router
page markup
UI
- React
Next.js renders with React
Fonts
- Duck Sans Product
self-hosted font
- Duck Sans Display
self-hosted font
Build
- Turbopack
/static-pages/home-minimal/_next/static/chunks/turbopack-…
How it's made
- RenderingPrerendered pages are built ahead of time and served as files. Pages rendered on each request are built by server code for every visitor. Pages drawn in the browser arrive nearly empty and depend on JavaScript, which most AI crawlers don't run. Islands are interactive parts in otherwise static HTML.
- PrerenderedNext.js getStaticPropsPages Router
- Cache-Control
- no-cache
- HTML
- 229.9 KB · sent Brotli-compressed
- Data for scriptsData the server writes into the HTML so JavaScript can pick up where the server left off (hydration). Browsers download and parse all of it before the page responds, so large payloads slow pages down, even when the page looks ready.
- Next.js page data 45.2 KB · 20% of the HTML
- Scripts
- 16 files · 17 inlineall from this site
Code from other sites Scripts a page loads from another domain run with the same power as its own code: they can read what visitors type and change the page. heade.rs checks what the HTML loads, not what tag managers add once they run.
The HTML loads no scripts from other sites.
Response headers
- server
- nginx
- date
- Mon, 12 Oct 2026 19:37:00 GMT
- content-type
- text/html; charset=UTF-8
- content-length
- 55295
- connection
- close
- vary
- Accept-Encoding
- etag
- "6ac94b24-d7ff"
- content-encoding
- br
- strict-transport-security
- max-age=31536000
- permissions-policy
- interest-cohort=()
- content-security-policy
default-src 'none' ; connect-src https://duck.ai https://*.duck.ai https://duckduckgo.com https://*.duckduckgo.com https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/ https://spreadprivacy.com ; manifest-src https://du… Show all
default-src 'none' ; connect-src https://duck.ai https://*.duck.ai https://duckduckgo.com https://*.duckduckgo.com https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/ https://spreadprivacy.com ; manifest-src https://duck.ai https://*.duck.ai https://duckduckgo.com https://*.duckduckgo.com https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/ https://spreadprivacy.com ; media-src https://duck.ai https://*.duck.ai https://duckduckgo.com https://*.duckduckgo.com https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/ https://spreadprivacy.com ; script-src blob: https://duck.ai https://*.duck.ai https://duckduckgo.com https://*.duckduckgo.com https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/ https://spreadprivacy.com 'unsafe-inline' 'unsafe-eval' ; font-src data: https://duck.ai https://*.duck.ai https://duckduckgo.com https://*.duckduckgo.com https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/ https://spreadprivacy.com ; img-src blob: data: https://duck.ai https://*.duck.ai https://duckduckgo.com https://*.duckduckgo.com https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/ https://spreadprivacy.com ; style-src https://duck.ai https://*.duck.ai https://duckduckgo.com https://*.duckduckgo.com https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/ https://spreadprivacy.com 'unsafe-inline' ; object-src 'none' ; worker-src blob: ; child-src blob: https://duck.ai https://*.duck.ai https://duckduckgo.com https://*.duckduckgo.com https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/ https://spreadprivacy.com ; frame-src blob: https://duck.ai https://*.duck.ai https://duckduckgo.com https://*.duckduckgo.com https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/ https://spreadprivacy.com ; form-action https://duck.ai https://*.duck.ai https://duckduckgo.com https://*.duckduckgo.com https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/ https://spreadprivacy.com ; frame-ancestors 'self' https://html.duckduckgo.com; base-uri 'self' ; block-all-mixed-content ;- x-frame-options
- SAMEORIGIN
- x-xss-protection
- 1;mode=block
- x-content-type-options
- nosniff
- referrer-policy
- origin
- expect-ct
- max-age=0
- nel
- {"report_to":"nel","max_age":86400,"failure_fraction":0.01}
- report-to
{"group":"nel","max_age":86400,"endpoints":[{"url":"https://euw.nel.duckduckgo.com/v1/report?region=use","priority":1,"weight":50},{"url":"https://ase.nel.duckduckgo.com/v1/report?region=use","priority":1,"weight":50},{"url":"https://use.ne… Show all
{"group":"nel","max_age":86400,"endpoints":[{"url":"https://euw.nel.duckduckgo.com/v1/report?region=use","priority":1,"weight":50},{"url":"https://ase.nel.duckduckgo.com/v1/report?region=use","priority":1,"weight":50},{"url":"https://use.nel.duckduckgo.com/v1/report?region=use","priority":2}]}- expires
- Mon, 12 Oct 2026 19:36:59 GMT
- cache-control
- no-cache
- set-cookie
- experiment_measuresearchesaa=treatment:dice; Path=/; Max-Age=31536000; SameSite=Lax; Secure
Details
Network
- IPv4
- 52.149.246.39
- ASNThe autonomous system number of the network that announces this address.
- AS8075
- Operator
- Microsoft Corporation
- HostingFrom the provider's own published list of its address ranges.
- GitHub · Actions runners
- PrefixThe block of addresses announced over BGP that contains this address.
- 52.148.0.0/14
- RPKIWhether a signed record (ROA) authorizes this network to announce this prefix.
- Valid
- VisibilityHow many bgp.tools peers carry this announcement.
- 3,201 peers
- Type
- Content
- Registry
- ARIN
Location
- Country
- United States
- Region
- Virginia
- City
- Dulles
- Coordinates
- 39.0367° N, 77.4209° W
- Accuracy
- Within about 20 km
- Time zone
- America/New_YorkUTC-4
- Local time
- 15:37
- Continent
- North America
Registration
RDAP- PopularityCloudflare Radar's ranking of domains by how often 1.1.1.1 users look them up.
- Top 500
- Registrar
- NameCheap, Inc.
- Registered
- Nov 11, 200718 years ago
- Expires
- Jun 23, 2027in 8 months
- Updated
- May 24, 2026
- StatusRegistry flags on the domain, such as locks that stop unauthorized transfers or changes.
- Transfer locked
- DNSSECDNSSEC signs DNS answers so they can't be forged on the way to you.
- Unsigned
- Name servers
- dns1.p05.nsone.netdns2.p05.nsone.netdns3.p05.nsone.netdns4.p05.nsone.netns01.quack-dns.comns02.quack-dns.comns03.quack-dns.comns04.quack-dns.com
- Registrant
- Redacted for privacy
Nov 11, 2007254 days leftJun 23, 2027
AI & agents
Open to AI crawlers
robots.txt lets every AI crawler in.
Crawlers
Allows allTrainingSearchOn request
They visit a page when someone asks an assistant about it. ChatGPT's, Perplexity's, Meta's and Amazon's treat robots.txt as advisory;
Anthropic's and Mistral's follow it.
OpenAIGPTBotallowedOAI-SearchBotallowedChatGPT-Userallowed
AnthropicClaudeBotallowedClaude-SearchBotallowedClaude-Userallowed
GoogleGoogle-ExtendedallowedGooglebotallowed—
Microsoft—bingbotallowed—
AppleApplebot-ExtendedallowedApplebotallowed—
Perplexity—PerplexityBotallowedPerplexity-Userallowed
MetaMeta-ExternalAgentallowedMeta-WebIndexerallowedMeta-ExternalFetcherallowed
AmazonAmazonbotallowedAmzn-SearchBotallowedAmzn-Userallowed
MistralMistralAI-TrainingallowedMistralAI-IndexallowedMistralAI-Userallowed
OthersCCBotallowedBytespiderallowedDuckAssistBotallowed
- Can cite itThe AI products that can use the site in their answers: each answers from one crawler (OAI-SearchBot for ChatGPT search, Googlebot for AI Overviews, bingbot for Copilot), and robots directives on the front page, like noindex, nosnippet and noarchive, keep some out.
- ChatGPT searchClaudePerplexityAI OverviewsGeminiCopilotMeta AISiri
Reading
- Without JavaScriptText on the front page before any scripts run: what GPTBot, ClaudeBot, PerplexityBot and most agents read. Google, Bing and Apple's crawlers run scripts.
- 64 words
- MarkdownAgents like Claude Code, Cursor and OpenCode ask for Markdown in their Accept header. It's the page without its markup, so it costs them far fewer tokens.
- Not offered
- llms.txtA Markdown file listing a site's key pages for AI tools. Coding agents read it; search crawlers mostly don't.
- Not published
- Structured dataschema.org JSON-LD in the page: facts about the site in a form machines read directly.
- None on the front page
Tools Ways an AI agent can do things on the site, not just read it: an MCP server that apps like Claude, ChatGPT and Cursor connect to, an API catalog, packaged agent skills, a shopping profile (UCP), or tools the page offers AI in the browser (WebMCP). heade.rs looks in the official MCP Registry and the files the site publishes under /.well-known/.
No MCP server, API catalog, agent skills, shopping profile or in-page tools found.