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// Other services

Port 1838: TALNET

Port 1838 is assigned by IANA to talnet (TALNET).

1838

How talnet works

Other services
client:1838talnetresponse client:1838talnetresponse

The client sends a request to port 1838 and the talnet 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 1838 dangerous?

We have no specific security note for port 1838. 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 1838

ServicePortTransportDescriptionReferenceUpdated
talnet 1838 TCP, UDP TALNET - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1838, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1838'      # process listening on 1838
sudo lsof -nP -i :1838

macOS

sudo lsof -nP -i :1838

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1838 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1838
netstat -ano | findstr :1838

From another machine

nmap -p 1838 -sV <host>
sudo nmap -sU -p 1838 <host>
nc -zv <host> 1838

Block it in the firewall

sudo ufw deny 1838/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1838" -Direction Inbound -LocalPort 1838 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1838 used for?

Port 1838 is assigned by IANA to talnet (TALNET).

Is port 1838 TCP or UDP?

Port 1838 is registered for TCP and UDP.

Is it safe to open port 1838?

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 1838 is open?

On Linux run "ss -ltnup 'sport = :1838'", on macOS "lsof -nP -i :1838", and on Windows "netstat -ano | findstr :1838" to see the local process. From another machine, "nmap -p 1838 <host>" shows whether it is reachable.

05 Related
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