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

404k.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 404k.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
12
A/AAAA targets
Subdomains
9
CT + scan + body
Record Types
1
seen in DNS
Observed Certs
17
in our scans

DNS Records

A
—
AAAA
—
MX
—
NS
dora.ns.cloudflare.com, rick.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
f.404k.workers.dev
188.114.97.0 2a06:98c1:3121::3 2a06:98c1:3120:: 172.67.160.121 +6
2026-08-21 21:03:49.732
hello-world-throbbing-wave-5107.404k.workers.dev
2606:4700:3031::ac43:a079 188.114.97.0 2606:4700:3036::6815:2271 2a06:98c1:3121::3 +6
2026-08-26 13:30:50.805
z.404k.workers.dev
188.114.97.0 2a06:98c1:3120:: 188.114.96.3 188.114.97.3 +2
2026-08-13 19:58:45.380
404k.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.

abcebfdc043fc2b7… digicert · wyvern2026h2
Subject: 404k.workers.dev
Issuer: WE1
SANs: 404k.workers.dev, *.hello-world-throbbing-wave-5107.404k.workers.dev
Valid: 2026-08-11 08:06:35 → 2026-11-09 09:06:17
c3426b34bb383670… google · argon2026h2
Subject: 404k.workers.dev
Issuer: WR1
SANs: 404k.workers.dev, *.hello-world-throbbing-wave-5107.404k.workers.dev
Valid: 2026-08-11 08:06:11 → 2026-11-09 09:05:51
5baa5afa880700d5… google · argon2026h2
Subject: 404k.workers.dev
Issuer: WE1
SANs: 404k.workers.dev, *.hello-world-throbbing-wave-5107.404k.workers.dev
Valid: 2026-08-11 07:53:27 → 2026-11-09 08:53:03
8ad70ac9d45472b7… digicert · wyvern2026h2
Subject: 404k.workers.dev
Issuer: WR1
SANs: 404k.workers.dev, *.hello-world-throbbing-wave-5107.404k.workers.dev
Valid: 2026-08-11 07:52:56 → 2026-11-09 08:50:04
28742552109ede7b… digicert · wyvern2026h2
Subject: 404k.workers.dev
Issuer: WE1
SANs: 404k.workers.dev, *.z.404k.workers.dev
Valid: 2026-08-10 23:25:40 → 2026-11-09 00:25:14
852ec42ee73da138… digicert · wyvern2026h2
Subject: 404k.workers.dev
Issuer: WR1
SANs: 404k.workers.dev, *.z.404k.workers.dev
Valid: 2026-08-10 23:25:07 → 2026-11-09 00:24:51
e0404451588e6513… google · argon2026h2
Subject: 404k.workers.dev
Issuer: WE1
SANs: 404k.workers.dev, *.z.404k.workers.dev
Valid: 2026-08-10 23:00:28 → 2026-11-09 00:00:09
1d5fd6f17cae0f2e… digicert · wyvern2026h2
Subject: 404k.workers.dev
Issuer: WR1
SANs: 404k.workers.dev, *.z.404k.workers.dev
Valid: 2026-08-10 23:00:03 → 2026-11-08 23:57:11
88fcf50e5b3c4aa3… google · argon2026h2
Subject: 404k.workers.dev
Issuer: WE1
SANs: 404k.workers.dev, *.f.404k.workers.dev
Valid: 2026-08-10 17:18:00 → 2026-11-08 18:17:54
0b929af530b0e4f8… digicert · wyvern2026h2
Subject: 404k.workers.dev
Issuer: WR1
SANs: 404k.workers.dev, *.f.404k.workers.dev
Valid: 2026-08-10 17:17:48 → 2026-11-08 18:17:36
dcda0f71e361a8be… digicert · wyvern2026h2
Subject: 404k.workers.dev
Issuer: WE1
SANs: 404k.workers.dev, *.f.404k.workers.dev
Valid: 2026-08-10 16:51:44 → 2026-11-08 17:51:23
38ef69895c39f835… digicert · wyvern2026h2
Subject: 404k.workers.dev
Issuer: WR1
SANs: 404k.workers.dev, *.f.404k.workers.dev
Valid: 2026-08-10 16:51:17 → 2026-11-08 17:49:50
fc544cff142ff324… google · xenon2026h2
Subject: 404k.workers.dev
Issuer: WE1
SANs: 404k.workers.dev, *.404k.workers.dev
Valid: 2026-07-06 00:38:53 → 2026-10-04 01:37:27
91bbe9464f18946f… google · xenon2026h2
Subject: 404k.workers.dev
Issuer: WE1
SANs: 404k.workers.dev, *.hello-world-throbbing-wave-5107.404k.workers.dev
Valid: 2026-06-13 07:31:13 → 2026-09-11 08:31:01
07157ec251c2a8ee… cloudflare · nimbus2026
Subject: 404k.workers.dev
Issuer: WR1
SANs: 404k.workers.dev, *.hello-world-throbbing-wave-5107.404k.workers.dev
Valid: 2026-06-13 07:30:54 → 2026-09-11 08:28:28
b250ebc311acbb4a… google · xenon2026h2
Subject: 404k.workers.dev
Issuer: WR1
SANs: 404k.workers.dev, *.z.404k.workers.dev
Valid: 2026-06-12 22:30:28 → 2026-09-10 23:27:55
c62a0d4758401bac… google · xenon2026h2
Subject: 404k.workers.dev
Issuer: WE1
SANs: 404k.workers.dev, *.f.404k.workers.dev
Valid: 2026-06-12 16:16:13 → 2026-09-10 17:16:00

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 dora.ns.cloudflare.com 2026-06-17 09:17:47.286 2026-08-26 13:30:50.805
NS rick.ns.cloudflare.com 2026-06-17 09:17:47.286 2026-08-26 13:30:50.805