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// Other services

Port 1238: hacl-qs

Port 1238 is assigned by IANA to hacl-qs (hacl-qs).

1238

How hacl-qs works

Other services
client:1238hacl-qsresponse client:1238hacl-qsresponse

The client sends a request to port 1238 and the hacl-qs 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 1238 dangerous?

We have no specific security note for port 1238. 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 1238

ServicePortTransportDescriptionReferenceUpdated
hacl-qs 1238 TCP, UDP hacl-qs - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1238, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1238'      # process listening on 1238
sudo lsof -nP -i :1238

macOS

sudo lsof -nP -i :1238

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1238 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1238
netstat -ano | findstr :1238

From another machine

nmap -p 1238 -sV <host>
sudo nmap -sU -p 1238 <host>
nc -zv <host> 1238

Block it in the firewall

sudo ufw deny 1238/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1238" -Direction Inbound -LocalPort 1238 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1238 used for?

Port 1238 is assigned by IANA to hacl-qs (hacl-qs).

Is port 1238 TCP or UDP?

Port 1238 is registered for TCP and UDP.

Is it safe to open port 1238?

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 1238 is open?

On Linux run "ss -ltnup 'sport = :1238'", on macOS "lsof -nP -i :1238", and on Windows "netstat -ano | findstr :1238" to see the local process. From another machine, "nmap -p 1238 <host>" shows whether it is reachable.

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