3 entries are registered on port 901. It is a well-known port (0–1023) — assignments here are IANA's, and a service found on one is usually the service that was assigned it.
services registered on this number
2 transports in use
entries encrypted on the wire
1 of 3 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :901 | Samba Web Admin (SWAT) | TCP | Web Services | caution | 21.9k |
| :901 | VMware VI Client | TCP | Network Services | caution | 7.8k |
| :901 | SMPNAMERES | TCPUDP | Network Services | safe | 0 |
The Samba Web Administration Tool (SWAT) is a web-based graphical interface designed to simplify the configuration and management of Samba servers. It provides administrators with an accessible means to configure Samba shares, manage users, and adjust server settings directly from a browser, easing tasks that would otherwise require manual editing of configuration files.
port 901 as Samba Web Admin (SWAT) →Port 901 is primarily used by the VMware Virtual Infrastructure (VI) Client, which facilitates management communication between VMware ESX/ESXi servers and the management interface. It often serves the connection flow from servers being managed back to the console, enabling user access to virtualization controls and management features.
port 901 as VMware VI Client →SMPNAMERES is an obscure IANA-assigned service on TCP and UDP port 901.
port 901 as SMPNAMERES →The registry says what 901 is registered to. What is listening on it right now is decided by the host, and only the host can be asked. Each of these prints the process behind the socket.
ss -ltnp | grep ':901\b'lsof -nP -iTCP:901 -sTCP:LISTENnetstat -ano | findstr :901On Linux and Windows the process name comes back with the socket; on macOS lsof needs sudo to name a process that isn't yours. Match what it prints against the 3 entries above.
A port number is not a service. Anything may listen on 901 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.
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