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Port 6087 (ldss)

IANA assigns port 6087 to ldss: Local Download Sharing Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ldss TCP Local Download Sharing Service Clifford Heath -
ldss UDP Local Download Sharing Service Clifford Heath -

Registry dates for this port: registered 2006-05.

Check what is listening on port 6087

Linux: is anything listening on TCP 6087?
sudo ss -tlnp 'sport = :6087'
Linux: UDP 6087
sudo ss -ulnp 'sport = :6087'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6087
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6087 '
Windows (Command Prompt)
netstat -ano | findstr :6087
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6087 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6087
From Windows
Test-NetConnection HOST -Port 6087
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6087

Block port 6087 in the firewall

ufw
sudo ufw deny 6087/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6087 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6087 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6087' -Direction Inbound -Protocol TCP -LocalPort 6087 -Action Block
ufw
sudo ufw deny 6087/udp
iptables
sudo iptables -A INPUT -p udp --dport 6087 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6087 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6087' -Direction Inbound -Protocol UDP -LocalPort 6087 -Action Block

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