Location
United States
Country level only
Domain
npmjs.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 valid104.17.128.0/20
Seen by 3,441 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.
Partly protected
DMARC applies to 5% of failing mail; the rest is delivered.
- 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 stspg-customer.com, mail.zendesk.com…
- DMARCTells receivers what to do with mail that fails SPF and DKIM: nothing (none), spam folder (quarantine) or reject.
- Quarantine5% of mail · sends 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
Anpmjs.com104.17.134.1175 min
Anpmjs.com104.17.135.1175 min
AAAAnpmjs.com2606:4700::6811:86755 min
AAAAnpmjs.com2606:4700::6811:87755 min
NSnpmjs.combayan.ns.cloudflare.com1 day
NSnpmjs.comsandy.ns.cloudflare.com1 day
MXnpmjs.com10 aspmx.l.google.com5 min
MXnpmjs.com20 alt1.aspmx.l.google.com5 min
MXnpmjs.com30 alt2.aspmx.l.google.com5 min
MXnpmjs.com40 aspmx2.googlemail.com5 min
MXnpmjs.com50 aspmx3.googlemail.com5 min
TXTnpmjs.com"9ppvqgfs31mbchvn33n601dh9sm545j0"30 sec
TXTnpmjs.com"MS=ms83736980"30 sec
TXTnpmjs.com"ZAMDPQHDY"30 sec
TXTnpmjs.com"ZOOM_verify_9jQN-O8pSrO7mY5zFjoF6g"30 sec
TXTnpmjs.com"google-site-verification=3olb25e_eHjiKH_mpKzq8anNryKG7fB3C2Hbrrnny6I"30 sec
TXTnpmjs.com"google-site-verification=KtNKHWHGMRbAhkVydBWxt9sJJF-vvtTMVK5S8AgtreA"30 sec
TXTnpmjs.com"status-page-domain-verification=gx37pw1xshfg"30 sec
TXTnpmjs.com"v=spf1 include:stspg-customer.com include:mail.zendesk.com include:_spf.google.com include:5326678.spf10.hubspotemail.net include:servers.mcsv.net include:amazonses.com ~all"30 sec
TXT_dmarc.npmjs.com"v=DMARC1; p=quarantine; pct=5; rua=mailto:dmarc@github.com,mailto:d@rua.agari.com"1 hr
CAAnpmjs.com0 issue "comodoca.com"5 min
CAAnpmjs.com0 issue "digicert.com; cansignhttpexchanges=yes"5 min
CAAnpmjs.com0 issue "letsencrypt.org"5 min
CAAnpmjs.com0 issue "pki.goog; cansignhttpexchanges=yes"5 min
CAAnpmjs.com0 issue "sectigo.com"5 min
CAAnpmjs.com0 issue "ssl.com"5 min
CAAnpmjs.com0 issuewild "comodoca.com"5 min
CAAnpmjs.com0 issuewild "digicert.com; cansignhttpexchanges=yes"5 min
CAAnpmjs.com0 issuewild "letsencrypt.org"5 min
CAAnpmjs.com0 issuewild "pki.goog; cansignhttpexchanges=yes"5 min
CAAnpmjs.com0 issuewild "sectigo.com"5 min
CAAnpmjs.com0 issuewild "ssl.com"5 min
HTTPSnpmjs.com1 . alpn=h2 ipv4hint=104.17.134.117,104.17.135.117 ipv6hint=2606:4700::6811:8675,2606:4700::6811:87755 min
Website
Page
403The site's bot protection turned away heade.rs's request (403), so the page couldn't be read.
Built with
- CloudFrom the provider's published address ranges.
- Cloudflare
- CDN
- Cloudflarecf-ray header
Tech stack
Cloudflare's bot check answered instead of the page, so only what the response headers and cookies say is shown here.
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
- Cloudflare
cf-ray header
Bot protection
- Cloudflare Bot Management
__cf_bm cookie
AI & agents
Turns away automated requests
Its bot protection refused heade.rs (403), so agents that fetch pages for people probably get the same answer, and robots.txt couldn't be read either.
Crawlers
robots.txt refusedThe site's bot protection answered heade.rs's request for robots.txt (403), so its crawler rules can't be read.
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.
- Page couldn't be read
- 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.
- Page couldn't be read
- 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.
- Page couldn't be read
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.
Details
Network
- IPv4
- 104.17.134.117
- 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.
- 104.17.128.0/20
- RPKIWhether a signed record (ROA) authorizes this network to announce this prefix.
- Valid
- VisibilityHow many bgp.tools peers carry this announcement.
- 3,441 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 5,000
- Registrar
- MarkMonitor Inc.
- Registered
- Mar 19, 201016 years ago
- Expires
- Mar 19, 2031in 4 years
- Updated
- Feb 20, 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
- bayan.ns.cloudflare.comsandy.ns.cloudflare.com
- Registrant
- Redacted for privacy
Mar 19, 20101,619 days leftMar 19, 2031
HTTPS
Certificate
Valid- Issuer
- Let's Encrypt
- Issuing CA
- YE1
- Covers
- *.npmjs.com, npmjs.com
- Also validOther unexpired certificates for this name, found in Certificate Transparency logs.
- 15 more certificates
Oct 7, 202684 days leftJan 5, 2027
From Certificate Transparency logs, via Cert Spotter.
Security
A+- HSTSStrict-Transport-Security makes browsers refuse plain HTTP to this site. Preloaded sites are HTTPS-only even on a first visit.
- 1 year · with subdomains
- 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
- 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.
- Sectigo, DigiCert, Let's Encrypt, Google Trust Services, SSL.com
- security.txtA standard file (RFC 9116) telling security researchers how to report vulnerabilities.
- Not published
Security headers 7 of 7
- HSTSpresent
- CSPpresent
- Framingpresent
- No sniffingpresent
- Referrerpresent
- Permissionspresent
- Isolationpresent
Response
403 Forbidden2 ms from CMH · 5.5 KBDNS lookup26 ms
301 npmjs.com6 ms
403 www.npmjs.com2 ms
DNSConnect (TCP + TLS)Waiting for the replyFrom Cloudflare's CMH data center
Response headers
- accept-ch
Sec-CH-UA-Bitness, Sec-CH-UA-Arch, Sec-CH-UA-Full-Version, Sec-CH-UA-Mobile, Sec-CH-UA-Model, Sec-CH-UA-Platform-Version, Sec-CH-UA-Full-Version-List, Sec-CH-UA-Platform, Sec-CH-UA, UA-Bitness, UA-Arch, UA-Full-Version, UA-Mobile, UA-Model,… Show all
Sec-CH-UA-Bitness, Sec-CH-UA-Arch, Sec-CH-UA-Full-Version, Sec-CH-UA-Mobile, Sec-CH-UA-Model, Sec-CH-UA-Platform-Version, Sec-CH-UA-Full-Version-List, Sec-CH-UA-Platform, Sec-CH-UA, UA-Bitness, UA-Arch, UA-Full-Version, UA-Mobile, UA-Model, UA-Platform-Version, UA-Platform, UA- cf-mitigated
- challenge
- cf-ray
- a4a038883f5b3f27-CMH
- connection
- close
- content-length
- 5628
- content-security-policy
default-src 'none'; script-src 'nonce-osDD1J8KLBy7Dmz4uodBQI' 'unsafe-eval' https://challenges.cloudflare.com; script-src-attr 'none'; style-src 'unsafe-inline'; img-src 'self' https://challenges.cloudflare.com; connect-src 'self' https://c… Show all
default-src 'none'; script-src 'nonce-osDD1J8KLBy7Dmz4uodBQI' 'unsafe-eval' https://challenges.cloudflare.com; script-src-attr 'none'; style-src 'unsafe-inline'; img-src 'self' https://challenges.cloudflare.com; connect-src 'self' https://challenges.cloudflare.com; frame-src 'self' https://challenges.cloudflare.com blob:; child-src 'self' https://challenges.cloudflare.com blob:; worker-src blob:; form-action http: https:; base-uri 'self'- content-type
- text/html; charset=UTF-8
- critical-ch
Sec-CH-UA-Bitness, Sec-CH-UA-Arch, Sec-CH-UA-Full-Version, Sec-CH-UA-Mobile, Sec-CH-UA-Model, Sec-CH-UA-Platform-Version, Sec-CH-UA-Full-Version-List, Sec-CH-UA-Platform, Sec-CH-UA, UA-Bitness, UA-Arch, UA-Full-Version, UA-Mobile, UA-Model,… Show all
Sec-CH-UA-Bitness, Sec-CH-UA-Arch, Sec-CH-UA-Full-Version, Sec-CH-UA-Mobile, Sec-CH-UA-Model, Sec-CH-UA-Platform-Version, Sec-CH-UA-Full-Version-List, Sec-CH-UA-Platform, Sec-CH-UA, UA-Bitness, UA-Arch, UA-Full-Version, UA-Mobile, UA-Model, UA-Platform-Version, UA-Platform, UA- cross-origin-embedder-policy
- require-corp
- cross-origin-opener-policy
- same-origin
- cross-origin-resource-policy
- same-origin
- date
- Tue, 13 Oct 2026 17:56:24 GMT
- origin-agent-cluster
- ?1
- permissions-policy
- accelerometer=(),camera=(),clipboard-read=(),clipboard-write=(),geolocation=(),gyroscope=(),hid=(),magnetometer=(),microphone=(),payment=(),publickey-credentials-get=(),screen-wake-lock=(),serial=(),sync-xhr=(),usb=(),xr-spatial-tracking=*
- referrer-policy
- same-origin
- server
- cloudflare
- server-timing
- chlray;desc="a4a038883f5b3f27"
- set-cookie
__cf_bm=7k9ferUo9TeaZghXBJPDkHemjW_cFlTN.h7ky5560vM-1791914184.991912-1.0.1.1-AS4MaiQawSaWE82rriQjUbEDGz.iGKQ2C9qEMa1FO83vu4Psb4IWvYaIN0RSEQeD7I.BJ.aIACKHJniiw8VTJpV2I3I84IvcQq1JzO3dZoxbOgcXM4NS7FT.BiQgijrM; HttpOnly; SameSite=None; Secure;… Show all
__cf_bm=7k9ferUo9TeaZghXBJPDkHemjW_cFlTN.h7ky5560vM-1791914184.991912-1.0.1.1-AS4MaiQawSaWE82rriQjUbEDGz.iGKQ2C9qEMa1FO83vu4Psb4IWvYaIN0RSEQeD7I.BJ.aIACKHJniiw8VTJpV2I3I84IvcQq1JzO3dZoxbOgcXM4NS7FT.BiQgijrM; HttpOnly; SameSite=None; Secure; Path=/; Domain=npmjs.com; Expires=Tue, 13 Oct 2026 18:26:24 GMT- strict-transport-security
- max-age=31536000; includeSubDomains; preload
- x-content-type-options
- nosniff
- x-frame-options
- SAMEORIGIN