Location
Ashburn, United States
Within about 20 km
Domain
paulgraham.com
Hosted on AWS EC2 in N. Virginia (us-east-1).
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.
AS14618Amazon
AWS · EC2 · N. Virginia
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 valid52.200.0.0/13
Seen by 3,135 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
- AS14618Amazon
Tracing from a probe near you with Globalping. Hop locations that its round-trip times rule out are left off the map.
Can be spoofed
There's no SPF or DMARC record, so anyone can send mail that claims to be from paulgraham.com.
- Receives mail
- Its own servers
- Mail servers
- milter2.store.yahoo.commilter1.store.yahoo.com
- SPFLists the servers allowed to send mail for the domain. Receivers check it against the sending server.
- Missing
- DMARCTells receivers what to do with mail that fails SPF and DKIM: nothing (none), spam folder (quarantine) or reject.
- Missing
- 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
Apaulgraham.com52.204.244.2372 min
Apaulgraham.com52.4.160.1842 min
NSpaulgraham.comns1.turbify.com1 day
NSpaulgraham.comns2.turbify.com1 day
MXpaulgraham.com10 milter2.store.yahoo.com20 min
MXpaulgraham.com10 milter1.store.yahoo.com20 min
Exposure
Open ports
4 open- 80HTTP
- 443HTTPS
- 4443HTTPS alt
- 8080HTTP alt
- Tags
- Cloud
- Seen asHostnames Shodan has seen pointing at, or presented by, this address.
- store.turbify.comec2-52-204-244-237.compute-1.amazonaws.compctekonline.comsearch.site.turbify.net+5 more
From Shodan InternetDB, updated weekly.
Details
Network
- IPv4
- 52.204.244.237
- Reverse DNSThe hostname this address points back to (its PTR record).
- ec2-52-204-244-237.compute-1.amazonaws.com
- ASNThe autonomous system number of the network that announces this address.
- AS14618
- Operator
- Amazon.com, Inc.
- HostingFrom the provider's own published list of its address ranges.
- AWS · EC2N. Virginia (us-east-1)
- PrefixThe block of addresses announced over BGP that contains this address.
- 52.200.0.0/13
- RPKIWhether a signed record (ROA) authorizes this network to announce this prefix.
- Valid
- VisibilityHow many bgp.tools peers carry this announcement.
- 3,135 peers
- Type
- Content
- Registry
- ARIN
Location
- Country
- United States
- Region
- Virginia
- City
- Ashburn
- Coordinates
- 39.0469° N, 77.4903° W
- Accuracy
- Within about 20 km
- Time zone
- America/New_YorkUTC-4
- Local time
- 12:05
- Continent
- North America
Registration
RDAP- Registrar
- easyDNS Technologies Inc.
- Registered
- Oct 29, 199827 years ago
- Expires
- Oct 28, 2026in 15 days
- Updated
- Oct 13, 2025
- StatusRegistry flags on the domain, such as locks that stop unauthorized transfers or changes.
- Transfer lockedUpdate locked
- DNSSECDNSSEC signs DNS answers so they can't be forged on the way to you.
- Unsigned
- Name servers
- yns1.yahoo.comyns2.yahoo.com
- Registrant
- Redacted for privacy
Oct 29, 199816 days leftOct 28, 2026
Website
Page
Paul Graham
Built with
- CloudFrom the provider's published address ranges.
- AWS · EC2 · N. Virginiaus-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
- AWS · EC2 · N. Virginiaus-east-1
AWS address range
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 requestCache-Control: private, max-age=3600
- Cache-Control
- private, max-age=3600
- HTML
- 5.2 KB · sent gzip-compressed
- Scripts
- 0 files · 2 inline
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.
HTTPS
Certificate
Valid- Issuer
- DigiCert
- Issuing CA
- Encryption Everywhere DV TLS CA - G2
- Covers
- paulgraham.com, www.paulgraham.com
- Also validOther unexpired certificates for this name, found in Certificate Transparency logs.
- 2 more certificates
Sep 21, 2026178 days leftApr 7, 2027
From Certificate Transparency logs, via Cert Spotter.
Security
F- 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.
- Not announced
- 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.
- Not published
Security headers 0 of 7
- HSTSmissing
- CSPmissing
- Framingmissing
- No sniffingmissing
- Referrermissing
- Permissionsmissing
- Isolationmissing
Response
200 OK189 ms from CMHDNS lookup45 ms
200 paulgraham.com189 ms
DNSConnect (TCP + TLS)Waiting for the replyFrom Cloudflare's CMH data center
Response headers
- date
- Mon, 12 Oct 2026 16:05:26 GMT
- cache-control
- private, max-age=3600
- x-xrds-location
- http://paulgraham.com/ystore/openid/rp.xrds
- vary
- User-Agent,Accept-Encoding
- expires
- Mon, 12 Oct 2026 17:05:26 GMT
- content-encoding
- gzip
- content-type
- text/html
- age
- 0
- transfer-encoding
- chunked
- connection
- close
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.
- 17 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.