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Port 6544 (lds-dump)

IANA assigns port 6544 to lds-dump: LDS Dump Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
lds-dump TCP LDS Dump Service Jack Baker -
lds-dump UDP LDS Dump Service Jack Baker -

Registry dates for this port: registered 2006-02.

Check what is listening on port 6544

Linux: is anything listening on TCP 6544?
sudo ss -tlnp 'sport = :6544'
Linux: UDP 6544
sudo ss -ulnp 'sport = :6544'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6544
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6544 '
Windows (Command Prompt)
netstat -ano | findstr :6544
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6544 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6544
From Windows
Test-NetConnection HOST -Port 6544
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6544

Block port 6544 in the firewall

ufw
sudo ufw deny 6544/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6544 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6544 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6544' -Direction Inbound -Protocol TCP -LocalPort 6544 -Action Block
ufw
sudo ufw deny 6544/udp
iptables
sudo iptables -A INPUT -p udp --dport 6544 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6544 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6544' -Direction Inbound -Protocol UDP -LocalPort 6544 -Action Block

Related ports

6515elipse-rec6543lds-distrib6547apc-65476548apc-6548

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