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// Network services

Port 11430: Lenbrook Service Discovery Protocol

Port 11430 is assigned by IANA to lsdp (Lenbrook Service Discovery Protocol).

11430

How lsdp works

Network services
client:11430lsdpresponse client:11430lsdpresponse

The client sends a request to port 11430 and the lsdp service answers.

Transport
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
Network services
01 Security

Is port 11430 dangerous?

We have no specific security note for port 11430. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 11430

ServicePortTransportDescriptionReferenceUpdated
lsdp 11430 UDP Lenbrook Service Discovery Protocol - 2014-03-27
-11430-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 11430, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11430'      # process listening on 11430
sudo lsof -nP -i :11430

macOS

sudo lsof -nP -i :11430

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11430 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11430
netstat -ano | findstr :11430

From another machine

nmap -p 11430 -sV <host>
sudo nmap -sU -p 11430 <host>
nc -zv <host> 11430

Block it in the firewall

sudo ufw deny 11430/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11430" -Direction Inbound -LocalPort 11430 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 11430 used for?

Port 11430 is assigned by IANA to lsdp (Lenbrook Service Discovery Protocol).

Is port 11430 TCP or UDP?

Port 11430 is registered for UDP.

Is it safe to open port 11430?

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. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 11430 is open?

On Linux run "ss -ltnup 'sport = :11430'", on macOS "lsof -nP -i :11430", and on Windows "netstat -ano | findstr :11430" to see the local process. From another machine, "nmap -p 11430 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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