CyberHunter
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// Other services

Port 1855: Fiorano RtrSvc

Port 1855 is assigned by IANA to fiorano-rtrsvc (Fiorano RtrSvc).

1855

How fiorano-rtrsvc works

Other services
client:1855fiorano-rtrsvcresponse client:1855fiorano-rtrsvcresponse

The client sends a request to port 1855 and the fiorano-rtrsvc 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 1855 dangerous?

We have no specific security note for port 1855. 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 1855

ServicePortTransportDescriptionReferenceUpdated
fiorano-rtrsvc 1855 TCP, UDP Fiorano RtrSvc - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1855, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1855'      # process listening on 1855
sudo lsof -nP -i :1855

macOS

sudo lsof -nP -i :1855

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1855 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1855
netstat -ano | findstr :1855

From another machine

nmap -p 1855 -sV <host>
sudo nmap -sU -p 1855 <host>
nc -zv <host> 1855

Block it in the firewall

sudo ufw deny 1855/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1855" -Direction Inbound -LocalPort 1855 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1855 used for?

Port 1855 is assigned by IANA to fiorano-rtrsvc (Fiorano RtrSvc).

Is port 1855 TCP or UDP?

Port 1855 is registered for TCP and UDP.

Is it safe to open port 1855?

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 1855 is open?

On Linux run "ss -ltnup 'sport = :1855'", on macOS "lsof -nP -i :1855", and on Windows "netstat -ano | findstr :1855" to see the local process. From another machine, "nmap -p 1855 <host>" shows whether it is reachable.

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