Port 43440Cisco EnergyWise Discovery and Command Flooding

Cisco EnergyWise uses UDP 43440 to discover peers and distribute commands within an EnergyWise domain.

transport: udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as ew-disc-cmd, ew-mgmt, Cisco EnergyWise Management

Technical Details

what runs on :43440

UDP port 43440 carries Cisco EnergyWise discovery and command-flooding traffic. Devices use discovery messages to find EnergyWise peers, then propagate commands through the EnergyWise domain; this is domain-level network management traffic, not a general-purpose interactive service. It uses UDP rather than a connection-oriented handshake, and deployments can configure a shared secret for domain authentication. Do not assume the traffic is encrypted or confidential.

Security Information

exposure of :43440

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.6 across 2,014 ports — this one sits 0.6 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

An exposed EnergyWise service may reveal device participation in an EnergyWise domain and, depending on domain configuration and authentication, could allow unauthorized commands affecting managed equipment or its power state. It is intended for a controlled management network, not the public internet; restrict it to trusted network segments and configure domain authentication. Internet-wide scan data has not observed this port open.

Record

iana registry entry

port: :43440
service: Cisco EnergyWise Discovery and Command Flooding
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: This is used by Cisco EnergyWise-enabled network devices, such as switches managing power on connected equipment. Engineers are most likely to encounter it on an EnergyWise-enabled campus or enterprise network, rather than on an internet-facing host.
lookups: 0rank 993
added: 2026-10-20
updated: 2026-10-20
references: IANA service name registry — port 43440

Something wrong?

This record is maintained by the engineers who use port 43440. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-20.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :43440Cisco EnergyWise Discovery and Command Flooding

Technical Details

Security Information

Related Ports

Port 43440Cisco EnergyWise Discovery and Command Flooding