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// Other services

Port 426: smartsdp

Port 426 is assigned by IANA to smartsdp (smartsdp).

426

How smartsdp works

Other services
client:426smartsdpresponse client:426smartsdpresponse

The client sends a request to port 426 and the smartsdp 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 426 dangerous?

We have no specific security note for port 426. 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 426

ServicePortTransportDescriptionReferenceUpdated
smartsdp 426 TCP, UDP smartsdp - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 426, and is it reachable?

Linux

sudo ss -ltnup 'sport = :426'      # process listening on 426
sudo lsof -nP -i :426

macOS

sudo lsof -nP -i :426

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 426 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 426
netstat -ano | findstr :426

From another machine

nmap -p 426 -sV <host>
sudo nmap -sU -p 426 <host>
nc -zv <host> 426

Block it in the firewall

sudo ufw deny 426/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 426" -Direction Inbound -LocalPort 426 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 426 used for?

Port 426 is assigned by IANA to smartsdp (smartsdp).

Is port 426 TCP or UDP?

Port 426 is registered for TCP and UDP.

Is it safe to open port 426?

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 426 is open?

On Linux run "ss -ltnup 'sport = :426'", on macOS "lsof -nP -i :426", and on Windows "netstat -ano | findstr :426" to see the local process. From another machine, "nmap -p 426 <host>" shows whether it is reachable.

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