Check-Host.cc

IP Address IPv4

3.133.221.212

Aggregated from public BGP, CT logs, our scan layer, honeypots and global probes.

Run a live full scan of 3.133.221.212

On-demand: ports, banners, TLS, tech-stack, subdomains and origin/IP-leak detection. Results are shared publicly for everyone to link to.

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ASN
AS16509
Amazon.com
Country
US
United States
Reverse DNS
ec2-3-133-221-212.us-east-2.compute.amazonaws.com
PTR
Open Ports
1
Last scan

Autonomous System

ASN
AS Name
Amazon.com
AS Type
RIR
ARIN
Allocated
2000-05-04
Allocation status
Allocated

Geolocation

Country
US · United States
Continent
North America
Source
MaxMind GeoLite2

Reverse DNS

Last seen
2026-05-27 03:29:10

Network

Prefix
RPKI

Open Ports

Port Proto Service Server Last seen
443 tcp https 2026-05-26 19:51:09.000

TLS Certificates

Port 443 c775f097f0bc…
Subject: astromat.org
Issuer: Amazon RSA 2048 M04
SANs: *.astromat.org, astromat.org
Valid 2025-12-22 00:00:00 → 2027-01-19 23:59:59

Tech Stack

Detected via Wappalyzer-style rules on the HTTP response body, headers, scripts and meta tags.

Origin / IP-Leak

USP

When a hostname is served behind a CDN (e.g. Cloudflare), the origin server can sometimes be identified by matching its TLS cert against the protected hostname. Findings shown here are heuristic candidates, not guarantees.

No origin-leak candidates for this IP

When this IP serves a TLS cert for a domain that fronts behind a CDN, that domain surfaces here as an origin-leak candidate with a confidence score.

Hosted Domains

1 domain resolve (A-record) to this IP.

Multi-Vantage Check

Reachability accrued passively from real user-triggered checks across our 65+ probe nodes. Run a live check to add fresh data.

No accumulated reachability data yet

Reachability accrues from real user-triggered checks. Trigger a Ping or HTTP check from our 65+ probe nodes to contribute the first data point.

Web Pages

Port Page title Status Flags
443 Astromat | Our System 200

Threat Intelligence

No threat-intel matches

This IP doesn't appear in any of the feeds we mirror (Tor exits, FireHOL Level 1-3, Spamhaus DROP/EDROP, URLhaus, OpenPhish). Absence here doesn't prove the IP is clean — it just means none of our public-feed sources flag it.

Co-Hosted Domains

Domains this host references in its HTML AND whose DNS A/AAAA record resolves back to this IP — i.e. actually hosted here.

www-staging.astromat.org DNS-confirmed

External References

Domains the body links to whose DNS does NOT resolve to this IP — usually CDN assets, embeds, or third-party services. Boilerplate (Google Fonts, jsDelivr, w3.org…) is already filtered.

doi.org href · ×45
images.prismic.io href · ×29
curator.jsc.nasa.gov href · ×27
dx.doi.org href · ×16
www.lpi.usra.edu href · ×5
astromat.org href · ×4
ui.adsabs.harvard.edu href · ×4
repo.astromat.org href · ×3
worlddatasystem.org href · ×3
ares.jsc.nasa.gov href · ×2
darts.isas.jaxa.jp href · ×2
www.coretrustseal.org href · ×2
ada.astromat.org href · ×2
www.nsf.gov href · ×1
datadryad.org href · ×1
www.nasa.gov href · ×1
www.astromat.org href · ×1
metbase.org href · ×1
www.hayabusa2.jaxa.jp href · ×1
stardust.jpl.nasa.gov href · ×1
science.nasa.gov href · ×1
lunar.geochron.org href · ×1
global.jaxa.jp href · ×1
meteoritical.org href · ×1
nssdc.gsfc.nasa.gov href · ×1
caslabs.case.edu href · ×1
bsky.app href · ×1
naturalhistory.si.edu href · ×1
meteorites.ucla.edu href · ×1
www.ldeo.columbia.edu href · ×1
nspires.nasaprs.com href · ×1

History

First observed
2026-05-26 16:26
Last observed
2026-05-26 19:51
Scan observations
4

The full change-log (ASN moves, cert rotations, port-state diffs) accumulates as our archives grow.