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Port 4172 (pcoip)

IANA assigns port 4172 to pcoip: PC over IP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pcoip TCP PC over IP HP Inc 2 -
pcoip UDP PC over IP HP Inc 2 -

Registry dates for this port: registered 2009-12-23, last modified 2026-03-10.

Check what is listening on port 4172

Linux: is anything listening on TCP 4172?
sudo ss -tlnp 'sport = :4172'
Linux: UDP 4172
sudo ss -ulnp 'sport = :4172'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4172
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4172 '
Windows (Command Prompt)
netstat -ano | findstr :4172
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4172 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4172
From Windows
Test-NetConnection HOST -Port 4172
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4172

Block port 4172 in the firewall

ufw
sudo ufw deny 4172/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4172 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4172 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4172' -Direction Inbound -Protocol TCP -LocalPort 4172 -Action Block
ufw
sudo ufw deny 4172/udp
iptables
sudo iptables -A INPUT -p udp --dport 4172 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4172 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4172' -Direction Inbound -Protocol UDP -LocalPort 4172 -Action Block

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