Check-Host.cc

IP Address IPv4

44.220.123.26

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

Run a live full scan of 44.220.123.26

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

Deep-scan now
ASN
AS16509
Amazon.com
Country
US
United States
Reverse DNS
ec2-44-220-123-26.compute-1.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 03:17:10

Network

Prefix
RPKI

Open Ports

Port Proto Service Server Last seen
443 tcp https 2026-05-26 15:08:46.000

TLS Certificates

Port 443 9b2b7c7aae7a…
Subject: calstudio.ai
Issuer: Amazon RSA 2048 M01
SANs: *.calstudio.ai, calstudio.ai
Valid 2026-05-10 00:00:00 → 2026-11-23 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

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 Toggle Menu 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.

calstudio.com DNS-confirmed
calstudio.com 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.

cal.com href · ×3
widget.intercom.io href · ×2
open.spotify.com href · ×1
us.i.posthog.com href · ×1
plausible.io href · ×1
luma.com href · ×1
api-iam.intercom.io href · ×1
app.getreditus.com href · ×1
cdn.tailwindcss.com href · ×1
twitter.com href · ×1
script.getreditus.com href · ×1
lu.ma href · ×1
client.crisp.chat href · ×1
datafa.st href · ×1
cdn.tolt.io href · ×1

History

First observed
2026-05-26 15:08
Last observed
2026-05-26 15:08
Scan observations
2

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