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// Other services

Port 1722: HKS License Manager

Port 1722 is assigned by IANA to hks-lm (HKS License Manager).

1722

How hks-lm works

Other services
client:1722hks-lmresponse client:1722hks-lmresponse

The client sends a request to port 1722 and the hks-lm 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 1722 dangerous?

We have no specific security note for port 1722. 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 1722

ServicePortTransportDescriptionReferenceUpdated
hks-lm 1722 TCP, UDP HKS License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1722, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1722'      # process listening on 1722
sudo lsof -nP -i :1722

macOS

sudo lsof -nP -i :1722

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1722 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1722
netstat -ano | findstr :1722

From another machine

nmap -p 1722 -sV <host>
sudo nmap -sU -p 1722 <host>
nc -zv <host> 1722

Block it in the firewall

sudo ufw deny 1722/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1722" -Direction Inbound -LocalPort 1722 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1722 used for?

Port 1722 is assigned by IANA to hks-lm (HKS License Manager).

Is port 1722 TCP or UDP?

Port 1722 is registered for TCP and UDP.

Is it safe to open port 1722?

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 1722 is open?

On Linux run "ss -ltnup 'sport = :1722'", on macOS "lsof -nP -i :1722", and on Windows "netstat -ano | findstr :1722" to see the local process. From another machine, "nmap -p 1722 <host>" shows whether it is reachable.

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