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Port 810 (fcp-udp)

IANA assigns port 810 to fcp-udp: FCP.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
fcp-udp TCP FCP Paul Whittemore -
fcp-udp UDP FCP Datagram Paul Whittemore -

Check what is listening on port 810

Linux: is anything listening on TCP 810?
sudo ss -tlnp 'sport = :810'
Linux: UDP 810
sudo ss -ulnp 'sport = :810'
Linux / macOS: which process owns the port
sudo lsof -nP -i :810
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':810 '
Windows (Command Prompt)
netstat -ano | findstr :810
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 810 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 810
From Windows
Test-NetConnection HOST -Port 810
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 810

Block port 810 in the firewall

ufw
sudo ufw deny 810/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 810 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 810 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 810' -Direction Inbound -Protocol TCP -LocalPort 810 -Action Block
ufw
sudo ufw deny 810/udp
iptables
sudo iptables -A INPUT -p udp --dport 810 -j DROP
nftables
sudo nft add rule inet filter input udp dport 810 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 810' -Direction Inbound -Protocol UDP -LocalPort 810 -Action Block

Related ports

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