CyberHunter
Local dataset, no network
// Other services

Port 3886: NEI management port

Port 3886 is assigned by IANA to nei-management (NEI management port).

3886

How nei-management works

Other services
client:3886nei-managementresponse client:3886nei-managementresponse

The client sends a request to port 3886 and the nei-management 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 3886 dangerous?

We have no specific security note for port 3886. 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 3886

ServicePortTransportDescriptionReferenceUpdated
nei-management 3886 TCP, UDP NEI management port - 2003-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 3886, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3886'      # process listening on 3886
sudo lsof -nP -i :3886

macOS

sudo lsof -nP -i :3886

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3886 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3886
netstat -ano | findstr :3886

From another machine

nmap -p 3886 -sV <host>
sudo nmap -sU -p 3886 <host>
nc -zv <host> 3886

Block it in the firewall

sudo ufw deny 3886/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3886" -Direction Inbound -LocalPort 3886 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3886 used for?

Port 3886 is assigned by IANA to nei-management (NEI management port).

Is port 3886 TCP or UDP?

Port 3886 is registered for TCP and UDP.

Is it safe to open port 3886?

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 3886 is open?

On Linux run "ss -ltnup 'sport = :3886'", on macOS "lsof -nP -i :3886", and on Windows "netstat -ano | findstr :3886" to see the local process. From another machine, "nmap -p 3886 <host>" shows whether it is reachable.

05 Related
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