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// Network services

Port 43440: Cisco EnergyWise Discovery and Command Flooding

Port 43440 is assigned by IANA to ew-disc-cmd (Cisco EnergyWise Discovery and Command Flooding), ew-mgmt (Cisco EnergyWise Management).

43440

How ew-disc-cmd works

Network services
client:43440ew-disc-cmdresponse client:43440ew-disc-cmdresponse

The client sends a request to port 43440 and the ew-disc-cmd service answers.

Transport
UDP · TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Network services
01 Security

Is port 43440 dangerous?

We have no specific security note for port 43440. 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 43440

ServicePortTransportDescriptionReferenceUpdated
ew-disc-cmd 43440 UDP Cisco EnergyWise Discovery and Command Flooding - 2009-05-19
ew-mgmt 43440 TCP Cisco EnergyWise Management - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 43440, and is it reachable?

Linux

sudo ss -ltnup 'sport = :43440'      # process listening on 43440
sudo lsof -nP -i :43440

macOS

sudo lsof -nP -i :43440

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 43440 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 43440
netstat -ano | findstr :43440

From another machine

nmap -p 43440 -sV <host>
sudo nmap -sU -p 43440 <host>
nc -zv <host> 43440

Block it in the firewall

sudo ufw deny 43440/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 43440" -Direction Inbound -LocalPort 43440 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 43440 used for?

Port 43440 is assigned by IANA to ew-disc-cmd (Cisco EnergyWise Discovery and Command Flooding), ew-mgmt (Cisco EnergyWise Management).

Is port 43440 TCP or UDP?

Port 43440 is registered for UDP and TCP.

Is it safe to open port 43440?

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 43440 is open?

On Linux run "ss -ltnup 'sport = :43440'", on macOS "lsof -nP -i :43440", and on Windows "netstat -ano | findstr :43440" to see the local process. From another machine, "nmap -p 43440 <host>" shows whether it is reachable.

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