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Port 6549 (apc-6549)

IANA assigns port 6549 to apc-6549: APC 6549.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
apc-6549 TCP APC 6549 American Power Conve -
apc-6549 UDP APC 6549 American Power Conve -

Check what is listening on port 6549

Linux: is anything listening on TCP 6549?
sudo ss -tlnp 'sport = :6549'
Linux: UDP 6549
sudo ss -ulnp 'sport = :6549'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6549
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6549 '
Windows (Command Prompt)
netstat -ano | findstr :6549
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6549 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6549
From Windows
Test-NetConnection HOST -Port 6549
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6549

Block port 6549 in the firewall

ufw
sudo ufw deny 6549/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6549 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6549 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6549' -Direction Inbound -Protocol TCP -LocalPort 6549 -Action Block
ufw
sudo ufw deny 6549/udp
iptables
sudo iptables -A INPUT -p udp --dport 6549 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6549 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6549' -Direction Inbound -Protocol UDP -LocalPort 6549 -Action Block

Related ports

6547apc-65476548apc-65486550fg-sysupdate6551sum

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