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// Other services

Port 4148: HHB Handheld Client

Port 4148 is assigned by IANA to hhb-handheld (HHB Handheld Client).

4148

How hhb-handheld works

Other services
client:4148hhb-handheldresponse client:4148hhb-handheldresponse

The client sends a request to port 4148 and the hhb-handheld 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 4148 dangerous?

We have no specific security note for port 4148. 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 4148

ServicePortTransportDescriptionReferenceUpdated
hhb-handheld 4148 TCP, UDP HHB Handheld Client - 2007-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 4148, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4148'      # process listening on 4148
sudo lsof -nP -i :4148

macOS

sudo lsof -nP -i :4148

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4148 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4148
netstat -ano | findstr :4148

From another machine

nmap -p 4148 -sV <host>
sudo nmap -sU -p 4148 <host>
nc -zv <host> 4148

Block it in the firewall

sudo ufw deny 4148/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4148" -Direction Inbound -LocalPort 4148 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4148 used for?

Port 4148 is assigned by IANA to hhb-handheld (HHB Handheld Client).

Is port 4148 TCP or UDP?

Port 4148 is registered for TCP and UDP.

Is it safe to open port 4148?

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 4148 is open?

On Linux run "ss -ltnup 'sport = :4148'", on macOS "lsof -nP -i :4148", and on Windows "netstat -ano | findstr :4148" to see the local process. From another machine, "nmap -p 4148 <host>" shows whether it is reachable.

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