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Port 5166 (winpcs)

IANA assigns port 5166 to winpcs: WinPCS Service Connection.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
winpcs TCP WinPCS Service Connection Complan Network AS -
winpcs UDP WinPCS Service Connection Complan Network AS -

Registry dates for this port: registered 2006-02.

Check what is listening on port 5166

Linux: is anything listening on TCP 5166?
sudo ss -tlnp 'sport = :5166'
Linux: UDP 5166
sudo ss -ulnp 'sport = :5166'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5166
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5166 '
Windows (Command Prompt)
netstat -ano | findstr :5166
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5166 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5166
From Windows
Test-NetConnection HOST -Port 5166
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5166

Block port 5166 in the firewall

ufw
sudo ufw deny 5166/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5166 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5166 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5166' -Direction Inbound -Protocol TCP -LocalPort 5166 -Action Block
ufw
sudo ufw deny 5166/udp
iptables
sudo iptables -A INPUT -p udp --dport 5166 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5166 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5166' -Direction Inbound -Protocol UDP -LocalPort 5166 -Action Block

Related ports

5164vpa, vpa-disc5165ife-icorp, ife_icorp5167scte1045168scte30

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