2 entries are registered on port 105. 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
2 of 2 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :105 | CCSO Nameserver | TCPUDP | Network Services | caution | 6.5k |
| :105 | CSNET Name Server | TCPUDP | Network Services | safe | 0 |
CCSO Nameserver Protocol, also known as Qi or Ph, is a directory and query service developed for managing information within large-scale academic institutions. It allows clients to query a central database to retrieve user contact details and other institutional directory information. Despite its decline in popularity, some legacy systems may continue to utilize it for internal lookup services.
port 105 as CCSO Nameserver →Legacy CSNET mailbox-name nameserver service assigned to TCP and UDP port 105.
port 105 as CSNET Name Server →The registry says what 105 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 ':105\b'lsof -nP -iTCP:105 -sTCP:LISTENnetstat -ano | findstr :105On 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 2 entries above.
A port number is not a service. Anything may listen on 105 — 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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