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Port 8555 (d-fence)

IANA assigns port 8555 to d-fence: SYMAX D-FENCE.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
d-fence TCP SYMAX D-FENCE Thomas Geisel -
d-fence UDP SYMAX D-FENCE Thomas Geisel -

Registry dates for this port: registered 2003-01.

Check what is listening on port 8555

Linux: is anything listening on TCP 8555?
sudo ss -tlnp 'sport = :8555'
Linux: UDP 8555
sudo ss -ulnp 'sport = :8555'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8555
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8555 '
Windows (Command Prompt)
netstat -ano | findstr :8555
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8555 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8555
From Windows
Test-NetConnection HOST -Port 8555
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8555

Block port 8555 in the firewall

ufw
sudo ufw deny 8555/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8555 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8555 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8555' -Direction Inbound -Protocol TCP -LocalPort 8555 -Action Block
ufw
sudo ufw deny 8555/udp
iptables
sudo iptables -A INPUT -p udp --dport 8555 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8555 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8555' -Direction Inbound -Protocol UDP -LocalPort 8555 -Action Block

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