Location
United States
Country level only
Domain
clickhouse.com
Served through Cloudflare's network, which answers from the location nearest each visitor.
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.
AS13335Cloudflare
Cloudflare, Inc.
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 valid172.66.40.0/21
Seen by 3,425 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
- AS13335Cloudflare
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 sent to spam under clickhouse.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 else6 of 10 DNS lookups · includes _spf.google.com, mktomail.com…
- DMARCTells receivers what to do with mail that fails SPF and DKIM: nothing (none), spam folder (quarantine) or reject.
- Quarantinesends 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
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HTTPSclickhouse.com1 . alpn=h3,h2 ipv4hint=172.66.40.249,172.66.43.7 ipv6hint=2606:4700:3108::ac42:28f9,2606:4700:3108::ac42:2b075 min
Website
Page
Fast Open-Source OLAP DBMS | ClickHouse
ClickHouse is a fast open-source column-oriented database management system that allows generating analytical data reports in real-time using SQL queries
- Language
- American English
Built with
- CloudFrom the provider's published address ranges.
- Cloudflare
- Hosting
- Vercelx-vercel-id header
- CDN
- Cloudflarecf-ray header
- Framework
- Next.jsx-nextjs-prerender header
HTTPS
Certificate
Valid- Issuer
- Google Trust Services
- Issuing CA
- WE1
- Covers
- clickhouse.com, data.clickhouse.com
- Also validOther unexpired certificates for this name, found in Certificate Transparency logs.
- 24 more certificates
Oct 5, 202682 days leftJan 3, 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.
- Not sent
- 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.
- Amazon, Sectigo, DigiCert, Let's Encrypt, Google Trust Services, SSL.com
- security.txtA standard file (RFC 9116) telling security researchers how to report vulnerabilities.
- security@clickhouse.com
Security headers 4 of 7
- HSTSmissing
- CSPpresent
- Framingpresent
- No sniffingpresent
- Referrerpresent
- Permissionsmissing
- Isolationmissing
Response
200 OK64 ms from CMHDNS lookup4 ms
200 clickhouse.com64 ms
DNSConnect (TCP + TLS)Waiting for the replyFrom Cloudflare's CMH data center
Response headers
- access-control-allow-origin
- *
- age
- 120219
- cache-control
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- cf-cache-status
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- date
- Tue, 13 Oct 2026 17:56:10 GMT
- etag
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- reporting-endpoints
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- server
- cloudflare
- set-cookie
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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
- Vercel
x-vercel-id header
CDN & edge
- Cloudflare
cf-ray header
Framework
- Next.jsApp Router
x-nextjs-prerender header
UI
- React
Next.js renders with React
Styling
- Tailwind CSS
187 Tailwind CSS class names
Fonts
- Basiersquare
self-hosted font
- Soehne Breit Buch S P
self-hosted font
- Soehne Breit Extrafett S P
self-hosted font
- Soehne Breit Fett S P
self-hosted font
- Soehne Buch S P
self-hosted font
- Soehne Dreiviertelfett S P
self-hosted font
- Soehne Extrafett S P
self-hosted font
- Soehne Fett S P
self-hosted font
Components & icons
- Lucide
8 Lucide class names
Bot protection
- Cloudflare Bot Management
__cf_bm cookie
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.
- Prerenderedx-nextjs-prerender headerApp Router
- 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 33 hr ago
- Cache-Control
- public, max-age=0, must-revalidate
- HTML
- 343.3 KB
- 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.
- React Server Components 189.1 KB · 55% of the HTML
- Scripts
- 26 files · 7 inline2 from other sites
- Render-blockingPlain scripts in the page's head, without async, defer or type=module. The browser shows nothing until each one has downloaded and run.
- 1 script
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.
- 0 of 2 scripts
Details
Network
- IPv4
- 172.66.43.7
- ASNThe autonomous system number of the network that announces this address.
- AS13335
- Operator
- Cloudflare, Inc.
- CDNFrom the provider's own published list of its address ranges.
- Cloudflare
- PrefixThe block of addresses announced over BGP that contains this address.
- 172.66.40.0/21
- RPKIWhether a signed record (ROA) authorizes this network to announce this prefix.
- Valid
- VisibilityHow many bgp.tools peers carry this announcement.
- 3,425 peers
- Type
- Content
- 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 50,000
- Registrar
- Squarespace Domains II LLC
- Registered
- Mar 12, 199927 years ago
- Expires
- Mar 12, 2032in 5 years
- Updated
- May 18, 2024
- StatusRegistry flags on the domain, such as locks that stop unauthorized transfers or changes.
- Delete lockedTransfer locked
- DNSSECDNSSEC signs DNS answers so they can't be forged on the way to you.
- Unsigned
- Name servers
- rick.ns.cloudflare.comroxy.ns.cloudflare.com
- Registrant
- Redacted for privacy
Mar 12, 19991,977 days leftMar 12, 2032
AI & agents
Open to AI crawlers
robots.txt lets every AI crawler in. Agents that ask for Markdown get 20.7 KB instead of 343.3 KB of HTML, and it offers an MCP server, an API catalog and 10 agent skills.
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
Content signals
Lines in robots.txt (Cloudflare's Content Signals Policy) saying whether pages may be used for search, as input to AI answers (ai-input) and for AI
training. No major AI company has said it follows them.
ai-train=yessearch=yesai-input=yes
It's on Cloudflare, which can also block AI crawlers at its edge whatever robots.txt says.
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.
- 1,286 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.
- On request20.7 KB, 17× smaller · converted by Cloudflare
- llms.txtA Markdown file listing a site's key pages for AI tools. Coding agents read it; search crawlers mostly don't.
- 452 links in 7 sections100.8 KB, long enough that some agents cut it off
- Structured dataschema.org JSON-LD in the page: facts about the site in a form machines read directly.
- WebSite
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/.
- MCP serverModel Context Protocol: a server that AI apps like Claude, ChatGPT and Cursor connect to so they can use a service's tools. Servers in the official MCP Registry are published under the domain's own name, which the registry checked. A server card, which the site's AI Catalog points to, says which MCP revisions the server speaks; 2026-07-28 is the first stateless one.
- ClickHouse Cloud MCP Servermcp.clickhouse.cloud
- APIsAn API catalog (RFC 9727, at /.well-known/api-catalog) lists a site's APIs and links to their machine-readable descriptions, usually OpenAPI.
- 1 in its API catalogapi.clickhouse.cloud · OpenAPI
- Agent skillsInstructions and scripts packaged for AI agents (SKILL.md), listed in an index at /.well-known/agent-skills/index.json or in the site's AI Catalog. Tools like Vercel's skills CLI install them.
- 10 skillsDiscovery v0.2.0
- AI catalogAn index at /.well-known/ai-catalog.json of a site's MCP servers, agents and skills, for agents to find them.
- 12 entries