Port 21053 services

3 entries are registered on port 2105. It is a registered port (1024–49151) — IANA records an assignee, but nothing stops other software from listening here, which is why the number carries more than one entry.

entries
3

services registered on this number

transport
tcp · udp

2 transports in use

in transit
0/3

entries encrypted on the wire

worst risk
4/10

1 of 3 iana-registered

Services on this port

ranked by lookups
portservicerisk
:2105eklogin Kerberos Remote Loginsafe
:2105Zephyr Notification Service (hm-serv)caution
:2105IBM MiniPaycaution

01eklogin Kerberos Remote Logintcp · udp · unofficial · risk 2/10

Port 2105 is used by eklogin, a version of the classic Unix remote login (rlogin) service that incorporates Kerberos encryption. It facilitates secure, authenticated remote terminal access by leveraging Kerberos to verify user identities and encrypt the login session. This port aims to provide a safer alternative to traditional rlogin, reducing risks from credential exposure and session hijacking over untrusted networks.

port 2105 as eklogin Kerberos Remote Login

02Zephyr Notification Service (hm-serv)tcp · udp · unofficial · risk 4/10

Port 2105 is utilized for the Zephyr Notification Service, specifically for Project Athena, facilitating communication with the host manager service (hm-serv). Although port 2102 is the preferred port for such communication, port 2105 might be encountered in certain configurations or legacy setups to support messaging and notification delivery within academic or research environments originally developed at MIT.

port 2105 as Zephyr Notification Service (hm-serv)

03IBM MiniPaytcp · udp · iana-registered · risk 4/10

IBM MiniPay is a specialized port used primarily to facilitate electronic payment processing within IBM systems. It typically supports financial and transaction data exchanges between IBM platforms and external financial services, ensuring streamlined integration with minimal latency. The port operates over both TCP and UDP transport protocols, enabling reliable and flexible communication required in payment environments.

port 2105 as IBM MiniPay

Which one is on your host

ask the machine, not the registry

The registry says what 2105 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.

linux
ss -ltnp | grep ':2105\b'
macos
lsof -nP -iTCP:2105 -sTCP:LISTEN
windows
netstat -ano | findstr :2105

On 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 2105 — 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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