CyberHunter
Local dataset, no network
// Other services

Port 1986: cisco license management

Port 1986 is assigned by IANA to licensedaemon (cisco license management).

1986

How licensedaemon works

Other services
client:1986licensedaemonresponse client:1986licensedaemonresponse

The client sends a request to port 1986 and the licensedaemon 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 1986 dangerous?

We have no specific security note for port 1986. 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 1986

ServicePortTransportDescriptionReferenceUpdated
licensedaemon 1986 TCP, UDP cisco license management - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1986, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1986'      # process listening on 1986
sudo lsof -nP -i :1986

macOS

sudo lsof -nP -i :1986

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1986 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1986
netstat -ano | findstr :1986

From another machine

nmap -p 1986 -sV <host>
sudo nmap -sU -p 1986 <host>
nc -zv <host> 1986

Block it in the firewall

sudo ufw deny 1986/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1986" -Direction Inbound -LocalPort 1986 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1986 used for?

Port 1986 is assigned by IANA to licensedaemon (cisco license management).

Is port 1986 TCP or UDP?

Port 1986 is registered for TCP and UDP.

Is it safe to open port 1986?

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 1986 is open?

On Linux run "ss -ltnup 'sport = :1986'", on macOS "lsof -nP -i :1986", and on Windows "netstat -ano | findstr :1986" to see the local process. From another machine, "nmap -p 1986 <host>" shows whether it is reachable.

05 Related
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