4factor.us
Aggregated from public BGP, CT logs, our scan layer, honeypots and global probes.
Run a live full scan of 4factor.us
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 |
|---|---|---|
| 4factor.us | 2026-08-24 03:57:50.381 | |
| www.4factor.us | 2026-08-24 03:57:50.381 | |
| linkedin.4factor.us | 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
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 |
|---|---|---|---|
| NS | ns58.domaincontrol.com | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |
| TXT | google-site-verification=O5xWHMK70XFgh6IeDFyasHBwIPLRXrbImwJlwiKCXOw | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |
| MX | 0 4factor-us.mail.protection.outlook.com | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |
| NS | ns57.domaincontrol.com | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |
| MX | 5 alt2.aspmx.l.google.com | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |
| MX | 10 alt4.aspmx.l.google.com | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |
| MX | 1 aspmx.l.google.com | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |
| MX | 5 alt1.aspmx.l.google.com | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |
| MX | 10 alt3.aspmx.l.google.com | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |
| TXT | v=spf1 include:dc-aa8e722993._spfm.4factor.us ~all | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |
| A | 185.158.133.1 | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |
| TXT | google-site-verification=crRw-WxZwmWKLkN6agNckvT5dIc70TqIcMYp0KeMc8o | 2026-08-24 03:54:50.325 | 2026-08-24 03:57:50.381 |