404.app
Aggregated from public BGP, CT logs, our scan layer, honeypots and global probes.
Run a live full scan of 404.app
On-demand: ports, banners, TLS, tech-stack, subdomains and origin/IP-leak detection. Results are shared publicly for everyone to link to.
DNS Records
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 |
|---|---|---|
| 404.app | 2026-08-27 01:39:50.754 |
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
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.
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 |
|---|---|---|---|
| TXT | protonmail-verification=75205b52e3b5d0ade03fb6c67c3ebdf4e258eca5 | 2026-06-19 22:00:07.440 | 2026-06-19 22:00:07.440 |
| TXT | openai-domain-verification=dv-SRUEmF5pr5jS86YEtWTIQ9Jx | 2026-06-19 22:00:07.440 | 2026-06-19 22:00:07.440 |
| NS | hank.ns.cloudflare.com | 2026-06-19 22:00:07.440 | 2026-08-27 01:39:50.754 |
| A | 188.114.97.3 | 2026-06-19 22:00:07.440 | 2026-06-19 22:00:07.440 |
| AAAA | 2a06:98c1:3120:: | 2026-06-19 22:00:07.440 | 2026-06-19 22:00:07.440 |
| NS | edna.ns.cloudflare.com | 2026-06-19 22:00:07.440 | 2026-08-27 01:39:50.754 |
| AAAA | 2a06:98c1:3121:: | 2026-06-19 22:00:07.440 | 2026-06-19 22:00:07.440 |
| A | 188.114.96.3 | 2026-06-19 22:00:07.440 | 2026-06-19 22:00:07.440 |
| A | 95.217.88.97 | 2026-08-21 05:22:26.261 | 2026-08-27 01:39:50.754 |