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// Other services

Port 1902: Fujitsu ICL Terminal Emulator Program B

Port 1902 is assigned by IANA to fjicl-tep-b (Fujitsu ICL Terminal Emulator Program B).

1902

How fjicl-tep-b works

Other services
client:1902fjicl-tep-bresponse client:1902fjicl-tep-bresponse

The client sends a request to port 1902 and the fjicl-tep-b service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1902 dangerous?

We have no specific security note for port 1902. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1902

ServicePortTransportDescriptionReferenceUpdated
fjicl-tep-b 1902 TCP, UDP Fujitsu ICL Terminal Emulator Program B - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1902, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1902'      # process listening on 1902
sudo lsof -nP -i :1902

macOS

sudo lsof -nP -i :1902

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1902 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1902
netstat -ano | findstr :1902

From another machine

nmap -p 1902 -sV <host>
sudo nmap -sU -p 1902 <host>
nc -zv <host> 1902

Block it in the firewall

sudo ufw deny 1902/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1902" -Direction Inbound -LocalPort 1902 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1902 used for?

Port 1902 is assigned by IANA to fjicl-tep-b (Fujitsu ICL Terminal Emulator Program B).

Is port 1902 TCP or UDP?

Port 1902 is registered for TCP and UDP.

Is it safe to open port 1902?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 1902 is open?

On Linux run "ss -ltnup 'sport = :1902'", on macOS "lsof -nP -i :1902", and on Windows "netstat -ano | findstr :1902" to see the local process. From another machine, "nmap -p 1902 <host>" shows whether it is reachable.

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