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// Other services

Port 1553: sna-cs

Port 1553 is assigned by IANA to sna-cs (sna-cs).

1553

How sna-cs works

Other services
client:1553sna-csresponse client:1553sna-csresponse

The client sends a request to port 1553 and the sna-cs 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 1553 dangerous?

We have no specific security note for port 1553. 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 1553

ServicePortTransportDescriptionReferenceUpdated
sna-cs 1553 TCP, UDP sna-cs - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1553, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1553'      # process listening on 1553
sudo lsof -nP -i :1553

macOS

sudo lsof -nP -i :1553

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1553 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1553
netstat -ano | findstr :1553

From another machine

nmap -p 1553 -sV <host>
sudo nmap -sU -p 1553 <host>
nc -zv <host> 1553

Block it in the firewall

sudo ufw deny 1553/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1553" -Direction Inbound -LocalPort 1553 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1553 used for?

Port 1553 is assigned by IANA to sna-cs (sna-cs).

Is port 1553 TCP or UDP?

Port 1553 is registered for TCP and UDP.

Is it safe to open port 1553?

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 1553 is open?

On Linux run "ss -ltnup 'sport = :1553'", on macOS "lsof -nP -i :1553", and on Windows "netstat -ano | findstr :1553" to see the local process. From another machine, "nmap -p 1553 <host>" shows whether it is reachable.

05 Related
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