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// Other services

Port 5618: Fiscal Registering Protocol

Port 5618 is assigned by IANA to efr (Fiscal Registering Protocol).

5618

How efr works

Other services
client:5618efrresponse client:5618efrresponse

The client sends a request to port 5618 and the efr service answers.

Transport
TCP
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 5618 dangerous?

We have no specific security note for port 5618. 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 5618

ServicePortTransportDescriptionReferenceUpdated
efr 5618 TCP Fiscal Registering Protocol - 2022-02-02
-5618-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5618, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5618'      # process listening on 5618
sudo lsof -nP -i :5618

macOS

sudo lsof -nP -i :5618

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5618 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5618
netstat -ano | findstr :5618

From another machine

nmap -p 5618 -sV <host>
nc -zv <host> 5618

Block it in the firewall

sudo ufw deny 5618/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5618" -Direction Inbound -LocalPort 5618 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5618 used for?

Port 5618 is assigned by IANA to efr (Fiscal Registering Protocol).

Is port 5618 TCP or UDP?

Port 5618 is registered for TCP.

Is it safe to open port 5618?

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 5618 is open?

On Linux run "ss -ltnup 'sport = :5618'", on macOS "lsof -nP -i :5618", and on Windows "netstat -ano | findstr :5618" to see the local process. From another machine, "nmap -p 5618 <host>" shows whether it is reachable.

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