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Port 282 (cableport-ax)

IANA assigns port 282 to cableport-ax: Cable Port A/X.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cableport-ax TCP Cable Port A/X Craig Langfahl -
cableport-ax UDP Cable Port A/X Craig Langfahl -

Check what is listening on port 282

Linux: is anything listening on TCP 282?
sudo ss -tlnp 'sport = :282'
Linux: UDP 282
sudo ss -ulnp 'sport = :282'
Linux / macOS: which process owns the port
sudo lsof -nP -i :282
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':282 '
Windows (Command Prompt)
netstat -ano | findstr :282
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 282 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 282
From Windows
Test-NetConnection HOST -Port 282
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 282

Block port 282 in the firewall

ufw
sudo ufw deny 282/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 282 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 282 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 282' -Direction Inbound -Protocol TCP -LocalPort 282 -Action Block
ufw
sudo ufw deny 282/udp
iptables
sudo iptables -A INPUT -p udp --dport 282 -j DROP
nftables
sudo nft add rule inet filter input udp dport 282 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 282' -Direction Inbound -Protocol UDP -LocalPort 282 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.