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Port 4125 (opsview-envoy)

IANA assigns port 4125 to opsview-envoy: Opsview Envoy.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
opsview-envoy TCP Opsview Envoy Ton Voon -
opsview-envoy UDP Opsview Envoy Ton Voon -

Registry dates for this port: registered 2008-09-26.

Check what is listening on port 4125

Linux: is anything listening on TCP 4125?
sudo ss -tlnp 'sport = :4125'
Linux: UDP 4125
sudo ss -ulnp 'sport = :4125'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4125
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4125 '
Windows (Command Prompt)
netstat -ano | findstr :4125
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4125 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4125
From Windows
Test-NetConnection HOST -Port 4125
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4125

Block port 4125 in the firewall

ufw
sudo ufw deny 4125/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4125 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4125 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4125' -Direction Inbound -Protocol TCP -LocalPort 4125 -Action Block
ufw
sudo ufw deny 4125/udp
iptables
sudo iptables -A INPUT -p udp --dport 4125 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4125 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4125' -Direction Inbound -Protocol UDP -LocalPort 4125 -Action Block

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