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Port 23333 (elxmgmt)

IANA assigns port 23333 to elxmgmt: Emulex HBAnyware Remote Management.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
elxmgmt TCP Emulex HBAnyware Remote Management Maziar Tamadon -
elxmgmt UDP Emulex HBAnyware Remote Management Maziar Tamadon -

Registry dates for this port: registered 2007-11-06.

Check what is listening on port 23333

Linux: is anything listening on TCP 23333?
sudo ss -tlnp 'sport = :23333'
Linux: UDP 23333
sudo ss -ulnp 'sport = :23333'
Linux / macOS: which process owns the port
sudo lsof -nP -i :23333
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':23333 '
Windows (Command Prompt)
netstat -ano | findstr :23333
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 23333 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 23333
From Windows
Test-NetConnection HOST -Port 23333
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 23333

Block port 23333 in the firewall

ufw
sudo ufw deny 23333/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 23333 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 23333 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 23333' -Direction Inbound -Protocol TCP -LocalPort 23333 -Action Block
ufw
sudo ufw deny 23333/udp
iptables
sudo iptables -A INPUT -p udp --dport 23333 -j DROP
nftables
sudo nft add rule inet filter input udp dport 23333 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 23333' -Direction Inbound -Protocol UDP -LocalPort 23333 -Action Block

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