Port 43440 (ew-mgmt, ew-disc-cmd)

IANA assigns port 43440 to ew-mgmt, ew-disc-cmd: Cisco EnergyWise Management.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

ew-mgmt TCP Cisco EnergyWise Management - -

ew-disc-cmd UDP Cisco EnergyWise Discovery and Command Flooding John Parello -

Registry dates for this port: registered 2009-05-19.

Linux: is anything listening on TCP 43440?

sudo ss -tlnp 'sport = :43440'

Linux: UDP 43440

sudo ss -ulnp 'sport = :43440'

Linux / macOS: which process owns the port

sudo lsof -nP -i :43440

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':43440 '

Windows (Command Prompt)

netstat -ano | findstr :43440

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 43440 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 43440

From Windows

Test-NetConnection HOST -Port 43440

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 43440

ufw

sudo ufw deny 43440/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 43440 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 43440 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 43440' -Direction Inbound -Protocol TCP -LocalPort 43440 -Action Block

ufw

sudo ufw deny 43440/udp

iptables

sudo iptables -A INPUT -p udp --dport 43440 -j DROP

nftables

sudo nft add rule inet filter input udp dport 43440 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 43440' -Direction Inbound -Protocol UDP -LocalPort 43440 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.