Check-Host.cc

IP Address IPv4

211.37.174.199

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

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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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Autonomous System

ASN
AS Name
KT Corporation (Korea Telecom)
AS Type
RIR
APNIC
Allocated
1996-04-22
Allocation status
Allocated

Geolocation

Country
KR · South Korea
Continent
Asia
Source
MaxMind GeoLite2

Reverse DNS

PTR
Last seen

Network

RPKI

Open Ports

Port Proto Service Server Last seen
25 tcp smtp 2026-07-21 06:26:13.000
443 tcp https Apache/2.4.41 (Ubuntu) 2026-07-22 13:09:49.000
3000 tcp 2026-06-15 05:52:20.000

TLS Certificates

Port 443 97ec98fff29c…
Subject: possapp.co.kr
Issuer: ZeroSSL RSA DV SSL CA 2
SANs: possapp.co.kr, www.possapp.co.kr
Valid 2026-06-25 00:00:00 → 2026-09-23 23:59:59
Port 443 d1c64acf703f…
Subject: possapp.co.kr
Issuer: ZeroSSL RSA Domain Secure Site CA
SANs: possapp.co.kr, www.possapp.co.kr
Valid 2026-03-16 00:00:00 → 2026-06-14 23:59:59
Port 443 d1c64acf703f…
Subject: possapp.co.kr
Issuer: ZeroSSL RSA Domain Secure Site CA
SANs: possapp.co.kr, www.possapp.co.kr
Valid 2026-03-16 00:00:00 → 2026-06-14 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

2 domains 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

Login panel served on port 443 — a sign-in form is exposed to the internet.

Port Page title Status Flags
443 스마트 안전관리 플랫폼 200 login

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.

possapp.co.kr 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.

translate.google.com href · ×42
dataflask.kr href · ×6

History

First observed
2026-05-26 10:22
Last observed
2026-07-22 13:09
Scan observations
11

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