Network Port
Port 523
Custom / ephemeral port
Total Hosts
337,222
last 90 d
Countries
12
distinct
Top Software
—
from banners
CVE Hits
—
NVD feed pending
Service Detail
Port
523
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 | 39,730 |
| AS37963 | Alibaba (China) | 12,118 |
| AS9488 | — | 4,858 |
| AS13335 | Cloudflare | 4,823 |
| AS7472 | — | 4,006 |
| AS4230 | Claro | 3,879 |
| AS1715 | — | 3,864 |
| AS1659 | Taiwan Academic Network(TANet) | 3,746 |
| AS40509 | — | 3,729 |
| AS197207 | Mobile Communication Company of Iran | 3,099 |
| AS98 | — | 2,935 |
| AS237 | Merit Network | 2,554 |
Recently Seen on Port 523
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.