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Port 10023 (cefd-vmp)

IANA assigns port 10023 to cefd-vmp: Comtech EF-Data's Vipersat Management Protocol.

Registered (user) port, 1024-49151 UDP

Port 10023 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
cefd-vmp UDP Comtech EF-Data's Vipersat Management Protocol Comtech -

Registry dates for this port: registered 2014-01-23.

Check what is listening on port 10023

Linux: UDP 10023
sudo ss -ulnp 'sport = :10023'
Linux / macOS: which process owns the port
sudo lsof -nP -i :10023
Windows (Command Prompt)
netstat -ano | findstr :10023
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 10023

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 10023

Block port 10023 in the firewall

ufw
sudo ufw deny 10023/udp
iptables
sudo iptables -A INPUT -p udp --dport 10023 -j DROP
nftables
sudo nft add rule inet filter input udp dport 10023 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 10023' -Direction Inbound -Protocol UDP -LocalPort 10023 -Action Block

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