HTTPfy

Port 6548 (apc-6548)

IANA assigns port 6548 to apc-6548: APC 6548.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
apc-6548 TCP APC 6548 American Power Conve -
apc-6548 UDP APC 6548 American Power Conve -

Check what is listening on port 6548

Linux: is anything listening on TCP 6548?
sudo ss -tlnp 'sport = :6548'
Linux: UDP 6548
sudo ss -ulnp 'sport = :6548'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6548
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6548 '
Windows (Command Prompt)
netstat -ano | findstr :6548
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6548 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6548
From Windows
Test-NetConnection HOST -Port 6548
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6548

Block port 6548 in the firewall

ufw
sudo ufw deny 6548/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6548 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6548 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6548' -Direction Inbound -Protocol TCP -LocalPort 6548 -Action Block
ufw
sudo ufw deny 6548/udp
iptables
sudo iptables -A INPUT -p udp --dport 6548 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6548 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6548' -Direction Inbound -Protocol UDP -LocalPort 6548 -Action Block

Related ports

6544lds-dump6547apc-65476549apc-65496550fg-sysupdate

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