Location
Philadelphia, United States
Within about 20 km
Domain
zincdata.com
Hosted by Fastmail in Philadelphia, United States.
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.
AS151847Fastmail
Fastmail Pty Ltd
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 valid103.168.172.0/24
Seen by 4,300 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
- AS151847Fastmail
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 only monitors (p=none): forged mail claiming to be from zincdata.com still reaches inboxes.
- Receives mail
- Fastmail
- Mail servers
- eu1-smtp.messagingengine.comeu2-smtp.messagingengine.com
- SPFLists the servers allowed to send mail for the domain. Receivers check it against the sending server.
- Neutral on everything else1 of 10 DNS lookups · includes spf.messagingengine.com
- DMARCTells receivers what to do with mail that fails SPF and DKIM: nothing (none), spam folder (quarantine) or reject.
- Monitor only
- 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
Azincdata.com103.168.172.371 hr
Azincdata.com103.168.172.521 hr
NSzincdata.comns1.messagingengine.com1 hr
NSzincdata.comns2.messagingengine.com1 hr
MXzincdata.com10 eu1-smtp.messagingengine.com1 hr
MXzincdata.com20 eu2-smtp.messagingengine.com1 hr
TXTzincdata.com"v=spf1 include:spf.messagingengine.com ?all"1 hr
TXT_dmarc.zincdata.com"v=DMARC1; p=none;"1 hr
Exposure
Open ports
2 open- 80HTTP
- 443HTTPS
- Software
- nginx
- Seen asHostnames Shodan has seen pointing at, or presented by, this address.
- www.stoerkersen.comwww.wjcerveny.comwww.messagingengine.comuser.fm
From Shodan InternetDB, updated weekly.
Details
Network
- IPv4
- 103.168.172.37
- Reverse DNSThe hostname this address points back to (its PTR record).
- www.messagingengine.com
- ASNThe autonomous system number of the network that announces this address.
- AS151847
- Operator
- Fastmail Pty Ltd
- PrefixThe block of addresses announced over BGP that contains this address.
- 103.168.172.0/24
- RPKIWhether a signed record (ROA) authorizes this network to announce this prefix.
- Valid
- VisibilityHow many bgp.tools peers carry this announcement.
- 4,300 peers
- Registry
- APNIC
Location
- Country
- United States
- Region
- Pennsylvania
- City
- Philadelphia
- Coordinates
- 39.9599° N, 75.1585° W
- Accuracy
- Within about 20 km
- Time zone
- America/New_YorkUTC-4
- Local time
- 12:04
- Continent
- North America
Registration
RDAP- Registrar
- CSL Computer Service Langenbach GmbH d/b/a joker.com
- Registered
- Nov 1, 201213 years ago
- Expires
- Nov 1, 2027next year
- Updated
- Sep 4, 2026
- StatusRegistry flags on the domain, such as locks that stop unauthorized transfers or changes.
- Transfer locked
- DNSSECDNSSEC signs DNS answers so they can't be forged on the way to you.
- Unsigned
- Name servers
- ns1.messagingengine.comns2.messagingengine.com
- Registrant
- Redacted for privacy
Nov 1, 2012385 days leftNov 1, 2027
Website
Page
ZincData
- Language
- British English
Built with
- Server
- nginxserver header “nginx”
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.
Server
- nginx
server header “nginx”
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 HTML6 words before any script runs
- HTML
- 11.1 KB · sent Brotli-compressed
- Scripts
- 0 files · 1 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
- Let's Encrypt
- Issuing CA
- YR1
- Covers
- zincdata.com
- Also validOther unexpired certificates for this name, found in Certificate Transparency logs.
- 2 more certificates
Sep 7, 202655 days leftDec 6, 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.
- 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 OK369 ms from CMHDNS lookup47 ms
200 zincdata.com369 ms
DNSConnect (TCP + TLS)Waiting for the replyFrom Cloudflare's CMH data center
Response headers
- server
- nginx
- date
- Mon, 12 Oct 2026 16:04:26 GMT
- content-type
- text/html; charset=utf-8
- transfer-encoding
- chunked
- connection
- close
- vary
- Accept-Encoding
- etag
- W/"c2eaf8c69716127760b945137cf12b9c0937eeac"
- access-control-allow-origin
- *
- content-disposition
- inline
- x-trace-id
- ti_71c584428a0e823d579e681c5da59d7a
- x-backend
- phl-web-03
- x-frontend
- phl-frontend-02
- x-cache-status
- MISS
- content-encoding
- br
AI & agents
Closed to AI crawlers
robots.txt turns away 25 AI crawlers, including the ones behind ChatGPT search, Claude and Perplexity.
Crawlers
Blocks 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.
OpenAIGPTBotblockedOAI-SearchBotblockedChatGPT-Userblocked
AnthropicClaudeBotblockedClaude-SearchBotblockedClaude-Userblocked
GoogleGoogle-ExtendedblockedGooglebotblocked—
Microsoft—bingbotblocked—
AppleApplebot-ExtendedblockedApplebotblocked—
Perplexity—PerplexityBotblockedPerplexity-Userblocked
MetaMeta-ExternalAgentblockedMeta-WebIndexerblockedMeta-ExternalFetcherblocked
AmazonAmazonbotblockedAmzn-SearchBotblockedAmzn-Userblocked
MistralMistralAI-TrainingblockedMistralAI-IndexblockedMistralAI-Userblocked
OthersCCBotblockedBytespiderblockedDuckAssistBotblocked
- 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.
- None
- Kept out of
- ChatGPT search: robots.txt blocks OAI-SearchBotClaude: robots.txt blocks Claude-SearchBotPerplexity: robots.txt blocks PerplexityBotAI Overviews: robots.txt blocks GooglebotGemini: robots.txt blocks Google-ExtendedCopilot: robots.txt blocks bingbotMeta AI: robots.txt blocks Meta-WebIndexerSiri: robots.txt blocks Applebot
Front page
Directives in the front page's robots meta tags or X-Robots-Tag header. noindex keeps it out of search, nosnippet out of Google's AI Overviews and
Siri's answers, and noarchive out of Copilot's.
noindexnoarchivenoainoimageai
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.
- 6 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.