Location
United States
Country level only
Domain
anthropic.com
Hosted by Anthropic, PBC in the United States. Only the country is known, which is common for anycast and CDN addresses.
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.
AS399358Anthropic, PBC
Anthropic, PBC
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 valid160.79.104.0/23
Seen by 3,051 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
- AS399358Anthropic, PBC
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 anthropic.com's DMARC policy, so forged mail doesn't reach inboxes.
- Receives mail
- Google Workspace
- Mail servers
- aspmx.l.google.comalt1.aspmx.l.google.comalt2.aspmx.l.google.com+2 more
- SPFLists the servers allowed to send mail for the domain. Receivers check it against the sending server.
- Soft-fails everything else1 of 10 DNS lookups · includes _spf.google.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).
- Not requested
- BIMIA brand logo that some mail apps show next to authenticated mail from the domain.
- Not published
DNS records
TypeNameValueTTL
Aanthropic.com160.79.104.105 min
AAAAanthropic.com2607:6bc0::105 min
NSanthropic.comisla.ns.cloudflare.com1 day
NSanthropic.comrandy.ns.cloudflare.com1 day
MXanthropic.com1 aspmx.l.google.com30 min
MXanthropic.com10 alt3.aspmx.l.google.com30 min
MXanthropic.com10 alt4.aspmx.l.google.com30 min
MXanthropic.com5 alt1.aspmx.l.google.com30 min
MXanthropic.com5 alt2.aspmx.l.google.com30 min
TXTanthropic.com"1password-site-verification=TO6XSBV6G5CTTA3Z3KKW2BS44M"1 min
TXTanthropic.com"5fnm79lyb330pg223w4zouc1qqd6ke2"1 min
TXTanthropic.com"6c43f0e4-7a6e-41f1-b393-a467b815c9ab"1 min
TXTanthropic.com"MS=ms40192081"1 min
TXTanthropic.com"MS=ms86816014"1 min
TXTanthropic.com"W6bXmYleKF5pLbpxzw6VcHcQTIyYh2M"1 min
TXTanthropic.com"asv=0f0dc2f902c508ffccf27f9408c23483"1 min
TXTanthropic.com"atlassian-domain-verification=I9Xbb3XhdwM5exlpz4aYPu3j6WwEaPCBQwANPQYdbYWWnqiwB9ULpjyw/bKJtKRf"1 min
TXTanthropic.com"atlassian-sending-domain-verification=80547484-e42a-4b89-bf3c-d8ffd4c3ebab"1 min
TXTanthropic.com"ca3-f11ea7ccbb494dba9a917fa7a141e281"1 min
TXTanthropic.com"cursor-domain-verification-crx2da=6b38eKFnztmRYqLTALmFfsXSO"1 min
TXTanthropic.com"elevenlabs=gYHFc9PeL2d2VTBdDhfMyRlxwOup_wM5bPLhmo2zux0"1 min
TXTanthropic.com"google-site-verification=KkmsJvGLnpKf_BQwhAx5mnK2OmoQPzrxES2P_0dD5rA"1 min
TXTanthropic.com"google-site-verification=YYRII7lPleimo7caNN0AKZHuihr3BGBskjT44gBolec"1 min
TXTanthropic.com"google-site-verification=_NED9Pp6OpundSy6MNEyuIbF-8mqgRoE2iGQDqH4wKo"1 min
TXTanthropic.com"google-site-verification=hcpp8MUuEqp_24yZzaMvQheLydlnxVWZ4Bbsv3rJocc"1 min
TXTanthropic.com"google-site-verification=lZ-Chr9wqR_c_yVXYrxvZjm7r4Dg44mLMda6GvQSaPA"1 min
TXTanthropic.com"google-site-verification=yIJD2JqRVo-AOCE_9rySL9RZFZDM9a_GatXkDuHGqmY"1 min
TXTanthropic.com"h1-domain-verification=ZEejAhpyT5wfKiZRsXi87LTQKM2QBySRC61439biYN9Jnq66"1 min
TXTanthropic.com"jetbrains-domain-verification=53i175ssi0qal446eoubiiun1"1 min
TXTanthropic.com"mongodb-site-verification=j1N3BwHxhEMDCEr5og46Cub3MmoNzq9x"1 min
TXTanthropic.com"paloaltonetworks-site-verification=ff19a5245abd982338280d302303afe5429d84bcecff2cdbb3c4961e8a794caf"1 min
TXTanthropic.com"parallel-domain-verification-1nq0xf=gmPYOOzn9XVn1qxa0KlVXIENX"1 min
TXTanthropic.com"segment-site-verification=bh66TwguDMclltZFX2wYU8sv2xwL0jYt"1 min
TXTanthropic.com"slack-domain-verification=j7g4p0r5GSLrk9O1CswTYqsKJRFURuy5qGKvmAbU"1 min
TXTanthropic.com"stripe-verification=421fc24e5cd4975f8577d411a2c34072be068dab6321e75505da641dadd31f84"1 min
TXTanthropic.com"stripe-verification=b4a23f9e5d7d2b9b0c10967235226410439ba826a420b7425970bf11dc1e1c5d"1 min
TXTanthropic.com"v=spf1 include:_spf.google.com ~all"1 min
TXTanthropic.com"wiz-domain-verification=06c4dd0706e50380f788c7acab07945e658246992e140f41657f86fb6c53c5e9"1 min
TXT_dmarc.anthropic.com"v=DMARC1; p=reject; sp=reject; rua=mailto:f0cef134490d4d43b9c134fc3c2a3481@dmarc-reports.cloudflare.net,mailto:dmarc-reports@anthropic.com; ruf=mailto:dmarc-reports@anthropic.com; fo=1"5 min
HTTPSanthropic.com1 . alpn=h3,h2 ipv4hint=160.79.104.10 ipv6hint=2607:6bc0::105 min
Details
Network
- IPv4
- 160.79.104.10
- ASNThe autonomous system number of the network that announces this address.
- AS399358
- Operator
- Anthropic, PBC
- PrefixThe block of addresses announced over BGP that contains this address.
- 160.79.104.0/23
- RPKIWhether a signed record (ROA) authorizes this network to announce this prefix.
- Valid
- VisibilityHow many bgp.tools peers carry this announcement.
- 3,051 peers
- Registry
- ARIN
Location
Country level- Country
- United States
- Continent
- North America
Registration
RDAP- PopularityCloudflare Radar's ranking of domains by how often 1.1.1.1 users look them up.
- Top 200
- Registrar
- MarkMonitor Inc.
- Registered
- Oct 2, 200125 years ago
- Expires
- Oct 2, 2033in 6 years
- Updated
- Oct 9, 2023
- StatusRegistry flags on the domain, such as locks that stop unauthorized transfers or changes.
- Delete lockedTransfer lockedUpdate locked
- DNSSECDNSSEC signs DNS answers so they can't be forged on the way to you.
- Unsigned
- Name servers
- isla.ns.cloudflare.comrandy.ns.cloudflare.com
- Registrant
- Redacted for privacy
Oct 2, 20012,548 days leftOct 2, 2033
HTTPS
Certificate
Valid- Issuer
- Google Trust Services
- Issuing CA
- WE1
- Covers
- *.anthropic.com, anthropic.com
- Also validOther unexpired certificates for this name, found in Certificate Transparency logs.
- 15 more certificates
Oct 11, 202689 days leftJan 9, 2027
From Certificate Transparency logs, via Cert Spotter.
Security
C- HSTSStrict-Transport-Security makes browsers refuse plain HTTP to this site. Preloaded sites are HTTPS-only even on a first visit.
- 3600 seconds
- HTTP → HTTPSWhether the plain http:// address redirects visitors to the secure one.
- Redirects
- HTTP/3The newest HTTP, over QUIC. Announced in the alt-svc header or the domain's HTTPS DNS record.
- Available
- Encrypted helloEncrypted Client Hello (ECH) hides which site you're visiting from anyone watching the connection.
- Not published
- CAADNS records naming the only certificate authorities allowed to issue certificates for the domain.
- Any CA may issue
- security.txtA standard file (RFC 9116) telling security researchers how to report vulnerabilities.
- https://hackerone.com/4f1f16ba-10d3-4d09-9ecc-c721aad90f24/embedded_submissions/new
Security headers 3 of 7
- HSTSpresent
- CSPpresent
- Framingpresent
- No sniffingmissing
- Referrermissing
- Permissionsmissing
- Isolationmissing
Response
200 OK37 ms from CMHDNS lookup4 ms
301 anthropic.com257 ms
200 www.anthropic.com37 ms
DNSConnect (TCP + TLS)Waiting for the replyFrom Cloudflare's CMH data center
Website
Page
Home \ Anthropic
Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.
- Language
- English
Built with
- Hosting
- Webflowpage markup
- CDN
- Cloudflarecf-ray header
Response headers
- age
- 256265
- alt-svc
- h3=":443"; ma=86400
- cf-cache-status
- DYNAMIC
- cf-ray
- a49794661feda691-CMH
- connection
- close
- content-security-policy
default-src 'self'; script-src 'self' 'unsafe-inline' https://cdn.intellimize.co https://cdnjs.cloudflare.com https://d3e54v103j8qbb.cloudfront.net https://cdn.prod.website-files.com https://hubspotonwebflow.com https://www.googletagmanager… Show all
default-src 'self'; script-src 'self' 'unsafe-inline' https://cdn.intellimize.co https://cdnjs.cloudflare.com https://d3e54v103j8qbb.cloudfront.net https://cdn.prod.website-files.com https://hubspotonwebflow.com https://www.googletagmanager.com https://a-cdn.anthropic.com https://connect.facebook.net https://www.youtube.com https://cdn.jsdelivr.net https://cdn.finsweet.com https://maps.googleapis.com https://js.hsforms.net https://player.vimeo.com https://claude.com/shared/webflow-antalytics.js https://assets.claude.ai/sdk/antalytics/; style-src 'self' 'unsafe-inline' https://cdn.prod.website-files.com https://cdnjs.cloudflare.com https://fonts.googleapis.com; img-src 'self' data: https://cdn.sanity.io https://assets.claude.com https://www-cdn.anthropic.com https://cdn.prod.website-files.com https://img.youtube.com https://i.ytimg.com https://www.facebook.com https://maps.googleapis.com https://maps.gstatic.com https://www.googletagmanager.com https://forms-na1.hsforms.com; frame-src 'self' https://www.youtube-nocookie.com https://www.youtube.com https://cdn.embedly.com https://assets.claude.ai https://a.anthropic.com https://*.intellimizeio.com https://anthropic.swoogo.com https://*.hsforms.com https://*.hubspot.com; connect-src 'self' blob: https://cdn.intellimize.co https://api.intellimize.co https://log.intellimize.co https://cdn.sanity.io https://assets.claude.com https://links.iterable.com https://a-cdn.anthropic.com https://a-api.anthropic.com https://www.facebook.com https://www.google-analytics.com https://cdn.prod.website-files.com https://hubspotonwebflow.com https://maps.googleapis.com https://vimeo.com https://www.googletagmanager.com https://code.claude.com https://forms.hsforms.com https://hubspot-forms-static-embed.s3.amazonaws.com https://cdnjs.cloudflare.com https://www.gstatic.com https://api.anthropic.com/api/event_logging/ https://claude.com; media-src 'self' https://cdn.sanity.io https://assets.claude.com; worker-src 'self' blob:; font-src 'self' data: https://cdn.prod.website-files.com https://fonts.gstatic.com; object-src 'none'; frame-ancestors 'self'; base-uri 'self'- content-type
- text/html; charset=utf-8
- date
- Mon, 12 Oct 2026 16:46:16 GMT
- last-modified
- Fri, 09 Oct 2026 17:35:59 GMT
- link
<https://cdn.prod.website-files.com>; rel=preconnect; crossorigin, <https://cdn.prod.website-files.com/67ce28cfec624e2b733f8a52/css/ant-brand.shared.0836b103a.min.css>; rel=preload; as=style; crossorigin; integrity="sha384-CDaxA6jrR4fLQHUvv… Show all
<https://cdn.prod.website-files.com>; rel=preconnect; crossorigin, <https://cdn.prod.website-files.com/67ce28cfec624e2b733f8a52/css/ant-brand.shared.0836b103a.min.css>; rel=preload; as=style; crossorigin; integrity="sha384-CDaxA6jrR4fLQHUvv38+Pf76EiIRTE+AwwBXkzvMgVhYibFaMQAmr/szbHpkdAm1"- server
- cloudflare
- set-cookie
- _cfuvid=PzZKZxma3zz47.Jbqg96.BUCm7hjDevVJ_SOKMhemEk-1791823576.0304623-1.0.1.1-2sOE9ynLhG7wZuvJlZgcMm2Pvev_RPGsLHylWjNW4Do; HttpOnly; SameSite=None; Secure; Path=/; Domain=website.anthropic.com
- strict-transport-security
- max-age=3600
- surrogate-control
- max-age=2147483647
- surrogate-key
- website.anthropic.com 67ce28cfec624e2b733f8a52 pageId:67f55a9666b2ae2332f5f893
- transfer-encoding
- chunked
- vary
- accept-encoding
- x-lambda-id
- 75735554-5498-4c87-8d75-282b2c060137
- x-wf-region
- us-east-1
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
- Webflow
page markup
CDN & edge
- Cloudflare
cf-ray header
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.
- Complete HTML713 words before any script runs
- Edge cacheWhether a CDN or proxy answered heade.rs's request from its cache, and how long ago that copy was made (the Age header).
- Not cachedCloudflare · made 3 days ago
- HTML
- 196.6 KB
- Scripts
- 11 files · 9 inline9 from other sites
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.
- Integrity checksSubresource Integrity: the script tag carries a hash of the file, so the browser refuses it if the other site changes it. Analytics and tag manager scripts change by design and can't carry one; pinned library files can.
- 5 of 9 scripts
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.
- 713 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.