CyberHunter
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// Other services

Port 1381: Apple Network License Manager

Port 1381 is assigned by IANA to apple-licman (Apple Network License Manager).

1381

How apple-licman works

Other services
client:1381apple-licmanresponse client:1381apple-licmanresponse

The client sends a request to port 1381 and the apple-licman 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 1381 dangerous?

We have no specific security note for port 1381. 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 1381

ServicePortTransportDescriptionReferenceUpdated
apple-licman 1381 TCP, UDP Apple Network License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1381, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1381'      # process listening on 1381
sudo lsof -nP -i :1381

macOS

sudo lsof -nP -i :1381

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1381 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1381
netstat -ano | findstr :1381

From another machine

nmap -p 1381 -sV <host>
sudo nmap -sU -p 1381 <host>
nc -zv <host> 1381

Block it in the firewall

sudo ufw deny 1381/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1381" -Direction Inbound -LocalPort 1381 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1381 used for?

Port 1381 is assigned by IANA to apple-licman (Apple Network License Manager).

Is port 1381 TCP or UDP?

Port 1381 is registered for TCP and UDP.

Is it safe to open port 1381?

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 1381 is open?

On Linux run "ss -ltnup 'sport = :1381'", on macOS "lsof -nP -i :1381", and on Windows "netstat -ano | findstr :1381" to see the local process. From another machine, "nmap -p 1381 <host>" shows whether it is reachable.

05 Related
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