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// Other services

Port 1954: ABR-API (diskbridge)

Port 1954 is assigned by IANA to abr-api (ABR-API (diskbridge)).

1954

How abr-api works

Other services
client:1954abr-apiresponse client:1954abr-apiresponse

The client sends a request to port 1954 and the abr-api 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 1954 dangerous?

We have no specific security note for port 1954. 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 1954

ServicePortTransportDescriptionReferenceUpdated
abr-api 1954 TCP, UDP ABR-API (diskbridge) - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1954, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1954'      # process listening on 1954
sudo lsof -nP -i :1954

macOS

sudo lsof -nP -i :1954

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1954 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1954
netstat -ano | findstr :1954

From another machine

nmap -p 1954 -sV <host>
sudo nmap -sU -p 1954 <host>
nc -zv <host> 1954

Block it in the firewall

sudo ufw deny 1954/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1954" -Direction Inbound -LocalPort 1954 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1954 used for?

Port 1954 is assigned by IANA to abr-api (ABR-API (diskbridge)).

Is port 1954 TCP or UDP?

Port 1954 is registered for TCP and UDP.

Is it safe to open port 1954?

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 1954 is open?

On Linux run "ss -ltnup 'sport = :1954'", on macOS "lsof -nP -i :1954", and on Windows "netstat -ano | findstr :1954" to see the local process. From another machine, "nmap -p 1954 <host>" shows whether it is reachable.

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