CyberHunter
Local dataset, no network
// Other services

Port 355: DATEX-ASN

Port 355 is assigned by IANA to datex-asn (DATEX-ASN).

355

How datex-asn works

Other services
client:355datex-asnresponse client:355datex-asnresponse

The client sends a request to port 355 and the datex-asn 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 355 dangerous?

We have no specific security note for port 355. 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 355

ServicePortTransportDescriptionReferenceUpdated
datex-asn 355 TCP, UDP DATEX-ASN - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 355, and is it reachable?

Linux

sudo ss -ltnup 'sport = :355'      # process listening on 355
sudo lsof -nP -i :355

macOS

sudo lsof -nP -i :355

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 355 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 355
netstat -ano | findstr :355

From another machine

nmap -p 355 -sV <host>
sudo nmap -sU -p 355 <host>
nc -zv <host> 355

Block it in the firewall

sudo ufw deny 355/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 355" -Direction Inbound -LocalPort 355 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 355 used for?

Port 355 is assigned by IANA to datex-asn (DATEX-ASN).

Is port 355 TCP or UDP?

Port 355 is registered for TCP and UDP.

Is it safe to open port 355?

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 355 is open?

On Linux run "ss -ltnup 'sport = :355'", on macOS "lsof -nP -i :355", and on Windows "netstat -ano | findstr :355" to see the local process. From another machine, "nmap -p 355 <host>" shows whether it is reachable.

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