CyberHunter
Local dataset, no network
// Other services

Port 1886: Leonardo over IP

Port 1886 is assigned by IANA to leoip (Leonardo over IP).

1886

How leoip works

Other services
client:1886leoipresponse client:1886leoipresponse

The client sends a request to port 1886 and the leoip 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 1886 dangerous?

We have no specific security note for port 1886. 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 1886

ServicePortTransportDescriptionReferenceUpdated
leoip 1886 TCP, UDP Leonardo over IP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1886, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1886'      # process listening on 1886
sudo lsof -nP -i :1886

macOS

sudo lsof -nP -i :1886

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1886 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1886
netstat -ano | findstr :1886

From another machine

nmap -p 1886 -sV <host>
sudo nmap -sU -p 1886 <host>
nc -zv <host> 1886

Block it in the firewall

sudo ufw deny 1886/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1886" -Direction Inbound -LocalPort 1886 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1886 used for?

Port 1886 is assigned by IANA to leoip (Leonardo over IP).

Is port 1886 TCP or UDP?

Port 1886 is registered for TCP and UDP.

Is it safe to open port 1886?

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 1886 is open?

On Linux run "ss -ltnup 'sport = :1886'", on macOS "lsof -nP -i :1886", and on Windows "netstat -ano | findstr :1886" to see the local process. From another machine, "nmap -p 1886 <host>" shows whether it is reachable.

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