Network Port
Port 4321
Custom / ephemeral port
Total Hosts
336,122
last 90 d
Countries
12
distinct
Top Software
—
from banners
CVE Hits
—
NVD feed pending
Service Detail
Port
4321
Protocol
TCP / UDP
Service
—
IANA Reserved
—
Common Risk
—
Top Software on this Port
No banners yet
banner-sweep hasn't fingerprinted a host on this port yet.
Top Countries
Top ASNs
| ASN | Name | IPs |
|---|---|---|
| AS396982 | Google Cloud | 37,603 |
| AS37963 | Alibaba (China) | 11,551 |
| AS197207 | Mobile Communication Company of Iran | 5,642 |
| AS13335 | Cloudflare | 4,304 |
| AS9488 | — | 3,885 |
| AS4230 | Claro | 3,717 |
| AS1715 | — | 3,573 |
| AS7472 | — | 3,468 |
| AS1659 | Taiwan Academic Network(TANet) | 3,415 |
| AS40509 | — | 3,243 |
| AS98 | — | 3,212 |
| AS20214 | Comcast - Miami/Pompano | 2,797 |
Recently Seen on Port 4321
Hosts most recently observed with this port open in our scan sweep.
CVE Matches
No version-matched CVEs
No published CVE exactly matches a software version seen on this port. Banners often omit versions, which limits precise matching.