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Port 5675 (v5ua)

IANA assigns port 5675 to v5ua: V5UA application port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
v5ua TCP V5UA application port - RFC 3807
v5ua UDP V5UA application port - RFC 3807
v5ua SCTP V5UA application port - RFC 3807

Check what is listening on port 5675

Linux: is anything listening on TCP 5675?
sudo ss -tlnp 'sport = :5675'
Linux: UDP 5675
sudo ss -ulnp 'sport = :5675'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5675
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5675 '
Windows (Command Prompt)
netstat -ano | findstr :5675
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5675 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5675
From Windows
Test-NetConnection HOST -Port 5675
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5675

Block port 5675 in the firewall

ufw
sudo ufw deny 5675/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5675 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5675 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5675' -Direction Inbound -Protocol TCP -LocalPort 5675 -Action Block
ufw
sudo ufw deny 5675/udp
iptables
sudo iptables -A INPUT -p udp --dport 5675 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5675 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5675' -Direction Inbound -Protocol UDP -LocalPort 5675 -Action Block

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