Location
United States
Country level only
Domain
hbr.org
Served through AWS CloudFront'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.
AS16509Amazon
AWS · CloudFront
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 valid18.238.24.0/22
Seen by 3,089 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
Tracing from a probe near you with Globalping. Hop locations that its round-trip times rule out are left off the map.
DNS records
TypeNameValueTTL
Ahbr.org18.238.25.281 min
Ahbr.org18.238.25.381 min
Ahbr.org18.238.25.501 min
Ahbr.org18.238.25.521 min
NShbr.orgns-1175.awsdns-18.org2 days
NShbr.orgns-1877.awsdns-42.co.uk2 days
NShbr.orgns-469.awsdns-58.com2 days
NShbr.orgns-604.awsdns-11.net2 days
MXhbr.org10 usb-smtp-inbound-1.mimecast.com30 min
MXhbr.org10 usb-smtp-inbound-2.mimecast.com30 min
TXThbr.org"MS=ms51679339"10 min
TXThbr.org"Wo71J1PNbWKkAikjb4WeqxCjBcNQwf6hcll0LJM6s9peRMF1ImcaCENQfddffLROaJY6wZHW2jrUsDNXC38vjg=="10 min
TXThbr.org"_1nl5kysnqxswpmo75e1u1fdcbs0fptr"10 min
TXThbr.org"atlassian-domain-verification=5VnB9cXf8cZ+rqMksjlq1KyEzUSjGsBJ5irmtvOZtpwtq6AsKSs+jGHcKUhotODA"10 min
TXThbr.org"ciscocidomainverification=3a5e2e428cc891b6aef0b7598537338dd5c2bf8fe96326d58d87f62324dd9733"10 min
TXThbr.org"docusign=59df337d-04fe-422f-bd8e-438fc3e80d21"10 min
TXThbr.org"extensis-domain-verification=3decd987-0352-469b-8111-a273b429588a"10 min
TXThbr.org"facebook-domain-verification=hvrm85rd5hvr18o50vzpd1lprkjg76"10 min
TXThbr.org"google-site-verification=0fyEgLpijqbt_OMG0ncBIK4G153eKqHF7UeGfTZgZk0"10 min
TXThbr.org"google-site-verification=P1JGD_hnkAqlxSPmsFW_M2nifpmJC2iBjnfmKi1uJCc"10 min
TXThbr.org"google-site-verification=ikLo_eYH7jY56yB4qtVoDTxY9WUWl7NkUEsM-UB6DT0"10 min
TXThbr.org"google-site-verification=o-E502ZnlfSSAM2JRb0RUfIxROmYDcYVOZnzlVRknS0"10 min
TXThbr.org"knowbe4-site-verification=f00a4d6e618b4a00b6f39e0b4c9e093f"10 min
TXThbr.org"lyncdiscover = seh3q1rpvadu98fpk213q7htq2"10 min
TXThbr.org"onetrust-domain-verification=0df7d79642a64b338bb91818045b158d"10 min
TXThbr.org"openai-domain-verification=dv-yzIW4FvevpXrgKYrQ9Ndlm4V"10 min
TXThbr.org"sip=m699vbpan7kdoitobogsq38e1k"10 min
TXThbr.org"smartsheet-site-validation=76f6Fdn8EnnOgbwX-KcCnJ5Nj66wRUeo"10 min
TXThbr.org"v=spf1 ip4:167.89.5.215 include:hbsp.harvard.edu include:amazonses.com include:u12602457.wl208.sendgrid.net include:aspmx.sailthru.com include:_spf.bigcommerce.com ~all"10 min
TXThbr.org"webexdomainverification.4C675B8B1892B136E053AB06FC0A3F65=7b2ac320-8920-4cf1-826d-975f96f199cb"10 min
TXT_dmarc.hbr.org"v=DMARC1; p=reject; pct=100; rua=mailto:ufwln6jz@ag.dmarcian.com; ruf=mailto:ufwln6jz@fr.dmarcian.com"5 min
CAAhbr.org0 iodef "mailto:hostmaster@harvardbusiness.org"1 min
CAAhbr.org0 issue "amazon.com"1 min
CAAhbr.org0 issue "amazonaws.com"1 min
CAAhbr.org0 issue "amazontrust.com"1 min
CAAhbr.org0 issue "awstrust.com"1 min
CAAhbr.org0 issue "digicert.com"1 min
CAAhbr.org0 issue "letsencrypt.org"1 min
CAAhbr.org0 issue "sectigo.com"1 min
HTTPS
Certificate
Valid- Issuer
- DigiCert
- Issuing CA
- Amazon RSA 2048 M04
- Covers
- *.hbr.org, hbr.org
- Also validOther unexpired certificates for this name, found in Certificate Transparency logs.
- 2 more certificates
Sep 15, 2026171 days leftMar 31, 2027
From Certificate Transparency logs, via Cert Spotter.
Security
D- HSTSStrict-Transport-Security makes browsers refuse plain HTTP to this site. Preloaded sites are HTTPS-only even on a first visit.
- 3 monthsPreload rejected
- 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.
- Not announced
- CAADNS records naming the only certificate authorities allowed to issue certificates for the domain.
- Amazon, DigiCert, Let's Encrypt, Sectigo
- security.txtA standard file (RFC 9116) telling security researchers how to report vulnerabilities.
- Not published
Security headers 4 of 7
- HSTSpresent
- CSPmissing
- Framingpresent
- No sniffingpresent
- Referrerpresent
- Permissionsmissing
- Isolationmissing
Response
200 OK107 ms from CMHDNS lookup6 ms
200 hbr.org107 ms
DNSConnect (TCP + TLS)Waiting for the replyFrom Cloudflare's CMH data center
Response headers
- content-type
- text/html; charset=utf-8
- transfer-encoding
- chunked
- connection
- close
- date
- Mon, 12 Oct 2026 16:46:05 GMT
- strict-transport-security
- max-age=7776000
- x-content-type-options
- nosniff
- referrer-policy
- strict-origin-when-cross-origin
- pragma
- no-cache
- permission-policy
accelerometer=(), ambient-light-sensor=(), autoplay=(), battery=(), camera=(), cross-origin-isolated=(), display-capture=(), document-domain=(), encrypted-media=(), execution-while-not-rendered=(), execution-while-out-of-viewport=(), fullsc… Show all
accelerometer=(), ambient-light-sensor=(), autoplay=(), battery=(), camera=(), cross-origin-isolated=(), display-capture=(), document-domain=(), encrypted-media=(), execution-while-not-rendered=(), execution-while-out-of-viewport=(), fullscreen=(), geolocation=(), gyroscope=(), keyboard-map=(), magnetometer=(), microphone=(), midi=(), navigation-override=(), payment=(), picture-in-picture=(), publickey-credentials-get=(), screen-wake-lock=(), sync-xhr=(), usb=(), web-share=(), xr-spatial-tracking=()- x-frame-options
- SAMEORIGIN
- cache-control
- private, no-cache, no-store, max-age=0, must-revalidate
- etag
- W/"13h76ee01zm7mvq"
- server
- content-encoding
- gzip
- vary
- Accept-Encoding
- x-cache
- Miss from cloudfront
- via
- 1.1 f25532604fcc511a64b290874ec82c0a.cloudfront.net (CloudFront)
- x-amz-cf-pop
- CMH68-P5
- x-amz-cf-id
- Wjr8dST_DqkY-LdG2R0EbX51lMz-wgmj4E9o9JNMz7tObWxYlYW90A==
Protected from spoofing
Mail that fails its checks is rejected under hbr.org's DMARC policy, so forged mail doesn't reach inboxes.
- Receives mail
- Mimecast
- Mail servers
- usb-smtp-inbound-1.mimecast.comusb-smtp-inbound-2.mimecast.com
- SPFLists the servers allowed to send mail for the domain. Receivers check it against the sending server.
- Soft-fails everything else10 of 10 DNS lookups · includes hbsp.harvard.edu, amazonses.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
Details
Network
- IPv4
- 18.238.25.28
- Reverse DNSThe hostname this address points back to (its PTR record).
- server-18-238-25-28.cmh68.r.cloudfront.net
- ASNThe autonomous system number of the network that announces this address.
- AS16509
- Operator
- Amazon.com, Inc.
- CDNFrom the provider's own published list of its address ranges.
- AWS · CloudFront
- PrefixThe block of addresses announced over BGP that contains this address.
- 18.238.24.0/22
- RPKIWhether a signed record (ROA) authorizes this network to announce this prefix.
- Valid
- VisibilityHow many bgp.tools peers carry this announcement.
- 3,089 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 20,000
- Registrar
- MarkMonitor Inc.
- Registered
- Dec 5, 199629 years ago
- Expires
- Dec 4, 2027next year
- Updated
- Aug 11, 2026
- 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
- ns-1175.awsdns-18.orgns-1877.awsdns-42.co.ukns-469.awsdns-58.comns-604.awsdns-11.net
- Registrant
- Redacted for privacy
Dec 5, 1996418 days leftDec 4, 2027
Website
Page
Harvard Business Review - Ideas and Advice for Leaders
Find new ideas and classic advice on strategy, innovation and leadership, for global leaders from the world's best business and management experts.
- Language
- English
Built with
- CloudFrom the provider's published address ranges.
- AWS · CloudFront
- CDN
- Amazon CloudFrontx-amz-cf-id header
- Framework
- Next.jspage markup
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.
CDN & edge
- Amazon CloudFront
x-amz-cf-id header
Framework
- Next.jsPages Router
page markup
UI
- React
Next.js renders with React
Styling
- CSS Modules
137 CSS Modules class names
Fonts
- GT America Standard
self-hosted font
- Tiempos Headline
self-hosted font
Build
- Turbopack
/_next/static/chunks/turbopack-2m7dz2rl5tltc.js
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.
- Rendered on each requestNext.js getServerSideProps renders it on every requestPages 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 in cache yetCloudFront
- Cache-Control
- private, no-cache, no-store, max-age=0, must-revalidate
- HTML
- 348.2 KB · sent gzip-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 183.5 KB · 53% of the HTML
- Scripts
- 14 files · 3 inline2 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.
- Advertising
- Google Ads
- 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
AI & agents
Open to AI search, limits training
The crawlers behind AI search may come in, and robots.txt turns away GPTBot, Google-Extended and CCBot. Blocking Google-Extended also keeps it out of Gemini's answers.
Crawlers
Blocks 3 of 25TrainingSearchOn 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.
OpenAIGPTBotblockedOAI-SearchBotallowedChatGPT-Userallowed
AnthropicClaudeBotallowedClaude-SearchBotallowedClaude-Userallowed
GoogleGoogle-ExtendedblockedGooglebotallowed—
Microsoft—bingbotallowed—
AppleApplebot-ExtendedallowedApplebotallowed—
Perplexity—PerplexityBotallowedPerplexity-Userallowed
MetaMeta-ExternalAgentallowedMeta-WebIndexerallowedMeta-ExternalFetcherallowed
AmazonAmazonbotallowedAmzn-SearchBotallowedAmzn-Userallowed
MistralMistralAI-TrainingallowedMistralAI-IndexallowedMistralAI-Userallowed
OthersCCBotblockedBytespiderallowedDuckAssistBotallowed
- 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 OverviewsCopilotMeta AISiri
- Kept out of
- Gemini: robots.txt blocks Google-Extended
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.
- 1,093 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/.
Couldn't check: the site didn't answer heade.rs's requests for its agent files.