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Port 8912 (wcbackup)

IANA assigns port 8912 to wcbackup: Windows Client Backup.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wcbackup TCP Windows Client Backup Jim Lyon -
wcbackup UDP Windows Client Backup Jim Lyon -

Registry dates for this port: registered 2005-11.

Check what is listening on port 8912

Linux: is anything listening on TCP 8912?
sudo ss -tlnp 'sport = :8912'
Linux: UDP 8912
sudo ss -ulnp 'sport = :8912'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8912
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8912 '
Windows (Command Prompt)
netstat -ano | findstr :8912
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8912 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8912
From Windows
Test-NetConnection HOST -Port 8912
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8912

Block port 8912 in the firewall

ufw
sudo ufw deny 8912/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8912 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8912 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8912' -Direction Inbound -Protocol TCP -LocalPort 8912 -Action Block
ufw
sudo ufw deny 8912/udp
iptables
sudo iptables -A INPUT -p udp --dport 8912 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8912 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8912' -Direction Inbound -Protocol UDP -LocalPort 8912 -Action Block

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