CyberHunter
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// Other services

Port 3885: TopFlow SSL

Port 3885 is assigned by IANA to topflow-ssl (TopFlow SSL).

3885

How topflow-ssl works

Other services
client:3885topflow-sslresponse client:3885topflow-sslresponse

The client sends a request to port 3885 and the topflow-ssl 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 3885 dangerous?

We have no specific security note for port 3885. 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 3885

ServicePortTransportDescriptionReferenceUpdated
topflow-ssl 3885 TCP, UDP TopFlow SSL - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3885, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3885'      # process listening on 3885
sudo lsof -nP -i :3885

macOS

sudo lsof -nP -i :3885

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3885 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3885
netstat -ano | findstr :3885

From another machine

nmap -p 3885 -sV <host>
sudo nmap -sU -p 3885 <host>
nc -zv <host> 3885

Block it in the firewall

sudo ufw deny 3885/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3885" -Direction Inbound -LocalPort 3885 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3885 used for?

Port 3885 is assigned by IANA to topflow-ssl (TopFlow SSL).

Is port 3885 TCP or UDP?

Port 3885 is registered for TCP and UDP.

Is it safe to open port 3885?

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 3885 is open?

On Linux run "ss -ltnup 'sport = :3885'", on macOS "lsof -nP -i :3885", and on Windows "netstat -ano | findstr :3885" to see the local process. From another machine, "nmap -p 3885 <host>" shows whether it is reachable.

05 Related
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