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// Other services

Port 1845: altalink

Port 1845 is assigned by IANA to altalink (altalink).

1845

How altalink works

Other services
client:1845altalinkresponse client:1845altalinkresponse

The client sends a request to port 1845 and the altalink 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 1845 dangerous?

We have no specific security note for port 1845. 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 1845

ServicePortTransportDescriptionReferenceUpdated
altalink 1845 TCP, UDP altalink - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1845, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1845'      # process listening on 1845
sudo lsof -nP -i :1845

macOS

sudo lsof -nP -i :1845

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1845 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1845
netstat -ano | findstr :1845

From another machine

nmap -p 1845 -sV <host>
sudo nmap -sU -p 1845 <host>
nc -zv <host> 1845

Block it in the firewall

sudo ufw deny 1845/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1845" -Direction Inbound -LocalPort 1845 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1845 used for?

Port 1845 is assigned by IANA to altalink (altalink).

Is port 1845 TCP or UDP?

Port 1845 is registered for TCP and UDP.

Is it safe to open port 1845?

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 1845 is open?

On Linux run "ss -ltnup 'sport = :1845'", on macOS "lsof -nP -i :1845", and on Windows "netstat -ano | findstr :1845" to see the local process. From another machine, "nmap -p 1845 <host>" shows whether it is reachable.

05 Related
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