Location
Ashburn, United States
Within about 50 km
Domain
sebastiaanbeek.nl
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 valid18.208.0.0/13
Seen by 3,136 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.
DNS records
TypeNameValueTTL
Asebastiaanbeek.nl18.208.88.1572 min
Asebastiaanbeek.nl98.84.224.1112 min
NSsebastiaanbeek.nldns1.p08.nsone.net1 hr
NSsebastiaanbeek.nldns2.p08.nsone.net1 hr
NSsebastiaanbeek.nldns3.p08.nsone.net1 hr
NSsebastiaanbeek.nldns4.p08.nsone.net1 hr
MXsebastiaanbeek.nl20 aspmx2.migadu.com1 hr
MXsebastiaanbeek.nl10 aspmx1.migadu.com1 hr
TXTsebastiaanbeek.nl"v=spf1 a mx include:spf.migadu.com ~all"1 hr
TXT_dmarc.sebastiaanbeek.nl"v=DMARC1; p=none; fo=1; rua=mailto:admin@sebastiaanbeek.nl"1 hr
Exposure
Open ports
2 open- 80HTTP
- 443HTTPS
- Tags
- Cloud
- Seen asHostnames Shodan has seen pointing at, or presented by, this address.
- whistlingconsultinggroup.comec2-18-208-88-157.compute-1.amazonaws.comnetlify.apphubtown-live.netlify.app
From Shodan InternetDB, updated weekly.
Details
Network
- IPv4
- 18.208.88.157
- Reverse DNSThe hostname this address points back to (its PTR record).
- ec2-18-208-88-157.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.
- 18.208.0.0/13
- RPKIWhether a signed record (ROA) authorizes this network to announce this prefix.
- Valid
- VisibilityHow many bgp.tools peers carry this announcement.
- 3,136 peers
- Type
- Content
- Registry
- ARIN
Location
- Country
- United States
- Region
- Virginia
- City
- Ashburn
- Coordinates
- 39.0469° N, 77.4903° W
- Accuracy
- Within about 50 km
- Time zone
- America/New_YorkUTC-4
- Local time
- 13:26
- Continent
- North America
Registration
RDAP- Registrar
- team.blue nl B.V.
- Registered
- Jan 12, 201115 years ago
- Updated
- Nov 27, 2022
- StatusRegistry flags on the domain, such as locks that stop unauthorized transfers or changes.
- Active
- DNSSECDNSSEC signs DNS answers so they can't be forged on the way to you.
- Unsigned
- Name servers
- dns4.p08.nsone.netdns2.p08.nsone.netdns3.p08.nsone.netdns1.p08.nsone.net
- Registrant
- Redacted for privacy
Partly protected
DMARC only monitors (p=none): forged mail claiming to be from sebastiaanbeek.nl still reaches inboxes.
- Receives mail
- Migadu
- Mail servers
- aspmx1.migadu.comaspmx2.migadu.com
- SPFLists the servers allowed to send mail for the domain. Receivers check it against the sending server.
- Soft-fails everything else7 of 10 DNS lookups · includes spf.migadu.com
- DMARCTells receivers what to do with mail that fails SPF and DKIM: nothing (none), spam folder (quarantine) or reject.
- Monitor onlysends 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
HTTPS
Certificate
Valid- Issuer
- Let's Encrypt
- Issuing CA
- YE2
- Covers
- *.sebastiaanbeek.nl, sebastiaanbeek.nl
- Also validOther unexpired certificates for this name, found in Certificate Transparency logs.
- 1 more certificate
Sep 17, 202665 days leftDec 16, 2026
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.
- 1 year
- 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 1 of 7
- HSTSpresent
- CSPmissing
- Framingmissing
- No sniffingmissing
- Referrermissing
- Permissionsmissing
- Isolationmissing
Response
200 OK588 ms from CMHDNS lookup42 ms
200 sebastiaanbeek.nl588 ms
DNSConnect (TCP + TLS)Waiting for the replyFrom Cloudflare's CMH data center
Website
Page
Sebastiaan Beek — Digital Product Designer
Crafting digital user experiences that enable users to reach their goals in a satisfying way.
- Language
- English
Built with
- CloudFrom the provider's published address ranges.
- AWS · EC2 · N. Virginiaus-east-1
- Hosting
- Netlifyx-nf-request-id header
- Framework
- Astropage markup
Response headers
- accept-ranges
- bytes
- age
- 0
- cache-control
- public,max-age=0,must-revalidate
- cache-status
- "Netlify Edge"; fwd=miss; fwd-status=200; stored
- content-encoding
- br
- content-type
- text/html; charset=UTF-8
- date
- Mon, 12 Oct 2026 17:26:09 GMT
- etag
- "4bf5d5383595c4fa3f47163fda9bc65a-ssl-df"
- server
- Netlify
- strict-transport-security
- max-age=31536000
- vary
- Accept-Encoding
- x-nf-request-id
- 01M4RJD0G9JEY92DWW471GN6RF
- connection
- close
- transfer-encoding
- chunked
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
- Netlify
x-nf-request-id header
Framework
- Astro
page markup
Fonts
- Inter
from Google Fonts
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 HTML257 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 in cache yetNetlify
- Cache-Control
- public,max-age=0,must-revalidate
- HTML
- 9.3 KB · sent Brotli-compressed
- Scripts
- 1 file · 1 inline1 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.
- Fonts
- Google Fonts
- 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 1 script
AI & agents
Open to AI crawlers
There's no robots.txt, so every AI crawler may come in.
Crawlers
No robots.txtTrainingSearchOn 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.
- 257 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.