Check-Host.cc
Try 1.1.1.1 AS13335 check-host.cc /country/de /tld/cc
Domain

404.workers.dev

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

DNS Check HTTP Check Run Full Scan .dev TLD

Run a live full scan of 404.workers.dev

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
Hosting IPs
6
A/AAAA targets
Subdomains
11
CT + scan + body
Record Types
1
seen in DNS
Observed Certs
7
in our scans

DNS Records

A
—
AAAA
—
MX
—
NS
erin.ns.cloudflare.com, jake.ns.cloudflare.com
TXT
—
CNAME
—
CAA
—

WHOIS / Registration

Registration data planned

Registrar, creation/expiry dates and domain status via RDAP. Rolling out gradually — bulk WHOIS is rate-limited, so we resolve on a prioritized cadence.

Subdomains

Every subdomain we know about — harvested from CT-log SANs, scan-observed certs and HTML body references — paired with its current A/AAAA target.

Subdomain Resolves to Last seen
hello-world.404.workers.dev
104.21.51.148 2606:4700:3034::6815:3394 172.67.181.183 2606:4700:3031::6815:3394 +2
2026-08-21 04:03:49.693
screenshots.404.workers.dev
2606:4700:3031::6815:3394 172.67.181.183 2606:4700:3033::ac43:b5b7 104.21.51.148
2026-08-11 08:49:43.764
404.workers.dev DNS pending —

Tech Stack

Tech detection pending

Wappalyzer-rules detect CMS, frameworks, analytics, JS libs and server-side languages on this domain.

TLS Certificates

Certificate observations pending

TLS certs naming this domain in subject or SANs will appear here as our scan-layer catches them.

IPs Citing This Domain

No citing IPs found yet

As the world-sweep progresses, hosts referencing this domain in their HTML will surface here.

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-IP leaks detected (yet)

Either this domain doesn't sit behind a CDN, or we haven't seen a TLS cert from a non-CDN IP matching this hostname. Run a fullscan to refresh the cert→IP cross-reference.

CT-Log Evidence

Certificates from public Certificate Transparency logs whose subject or SAN names this domain — including historic certs we never observed live.

e3dfd2bc6072b4d0… google · argon2026h2
Subject: 404.workers.dev
Issuer: WE1
SANs: 404.workers.dev, *.screenshots.404.workers.dev
Valid: 2026-08-09 03:48:00 → 2026-11-07 04:47:42
ae63c0f2bd61b5e7… google · argon2026h2
Subject: 404.workers.dev
Issuer: WR1
SANs: 404.workers.dev, *.screenshots.404.workers.dev
Valid: 2026-08-09 03:47:36 → 2026-11-07 04:47:17
0b5f271eef873474… google · argon2026h2
Subject: 404.workers.dev
Issuer: WE1
SANs: 404.workers.dev, *.screenshots.404.workers.dev
Valid: 2026-08-09 03:37:23 → 2026-11-07 04:36:45
fead0da94e5fb0a8… google · argon2026h2
Subject: 404.workers.dev
Issuer: WR1
SANs: 404.workers.dev, *.screenshots.404.workers.dev
Valid: 2026-08-09 03:36:38 → 2026-11-07 04:33:31
1057319949ab8859… google · xenon2026h2
Subject: 404.workers.dev
Issuer: WR1
SANs: 404.workers.dev, *.screenshots.404.workers.dev
Valid: 2026-06-11 03:15:07 → 2026-09-09 04:14:53
2a5482136dddc3f1… google · xenon2026h2
Subject: 404.workers.dev
Issuer: WE1
SANs: 404.workers.dev, *.screenshots.404.workers.dev
Valid: 2026-06-11 03:09:31 → 2026-09-09 04:09:19
5b69e4ed7c31a0df… google · xenon2026h2
Subject: 404.workers.dev
Issuer: WR1
SANs: 404.workers.dev, *.hello-world.404.workers.dev
Valid: 2026-06-06 03:01:05 → 2026-09-04 03:58:27

Threat Intelligence

Domain threat-intel pending

Matches in URLhaus, OpenPhish, PhishTank, malware feeds, and Spamhaus DBL.

History

Passive DNS — every value this name ever resolved to and when we first / last observed it. Updates every cycle of our forward-DNS crawler.

Type Value First seen Last seen
NS erin.ns.cloudflare.com 2026-06-03 15:27:33.469 2026-08-21 04:03:49.693
NS jake.ns.cloudflare.com 2026-06-03 15:27:33.469 2026-08-21 04:03:49.693