CyberHunter
Local dataset, no network
// Other services

Port 5585: BeInSync-sync

Port 5585 is assigned by IANA to bis-sync (BeInSync-sync).

5585

How bis-sync works

Other services
client:5585bis-syncresponse client:5585bis-syncresponse

The client sends a request to port 5585 and the bis-sync 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 5585 dangerous?

We have no specific security note for port 5585. 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 5585

ServicePortTransportDescriptionReferenceUpdated
bis-sync 5585 TCP, UDP BeInSync-sync - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 5585, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5585'      # process listening on 5585
sudo lsof -nP -i :5585

macOS

sudo lsof -nP -i :5585

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5585 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5585
netstat -ano | findstr :5585

From another machine

nmap -p 5585 -sV <host>
sudo nmap -sU -p 5585 <host>
nc -zv <host> 5585

Block it in the firewall

sudo ufw deny 5585/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5585" -Direction Inbound -LocalPort 5585 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5585 used for?

Port 5585 is assigned by IANA to bis-sync (BeInSync-sync).

Is port 5585 TCP or UDP?

Port 5585 is registered for TCP and UDP.

Is it safe to open port 5585?

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 5585 is open?

On Linux run "ss -ltnup 'sport = :5585'", on macOS "lsof -nP -i :5585", and on Windows "netstat -ano | findstr :5585" to see the local process. From another machine, "nmap -p 5585 <host>" shows whether it is reachable.

05 Related
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