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// Other services

Port 1386: CheckSum License Manager

Port 1386 is assigned by IANA to checksum (CheckSum License Manager).

1386

How checksum works

Other services
client:1386checksumresponse client:1386checksumresponse

The client sends a request to port 1386 and the checksum 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 1386 dangerous?

We have no specific security note for port 1386. 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 1386

ServicePortTransportDescriptionReferenceUpdated
checksum 1386 TCP, UDP CheckSum License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1386, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1386'      # process listening on 1386
sudo lsof -nP -i :1386

macOS

sudo lsof -nP -i :1386

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1386 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1386
netstat -ano | findstr :1386

From another machine

nmap -p 1386 -sV <host>
sudo nmap -sU -p 1386 <host>
nc -zv <host> 1386

Block it in the firewall

sudo ufw deny 1386/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1386" -Direction Inbound -LocalPort 1386 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1386 used for?

Port 1386 is assigned by IANA to checksum (CheckSum License Manager).

Is port 1386 TCP or UDP?

Port 1386 is registered for TCP and UDP.

Is it safe to open port 1386?

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 1386 is open?

On Linux run "ss -ltnup 'sport = :1386'", on macOS "lsof -nP -i :1386", and on Windows "netstat -ano | findstr :1386" to see the local process. From another machine, "nmap -p 1386 <host>" shows whether it is reachable.

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