HTTPfy

Port 10051 (Zabbix server/trapper)

Active Zabbix agents and proxies send data to the server on 10051.

Registered (user) port, 1024-49151 TCP Monitoring and logging Do not expose to the internet

What port 10051 is used for

Active Zabbix agents and proxies send data to the server on 10051.

Security: should port 10051 be open?

Do not expose to the internet. Allow only monitored networks; use PSK or certificate encryption.

IANA assignment

Service nameProtoDescriptionAssigneeReference
zabbix-trapper TCP Zabbix Trapper Alexei Vladishev -
zabbix-trapper UDP Zabbix Trapper Alexei Vladishev -

Registry dates for this port: registered 2006-02.

Check what is listening on port 10051

Linux: is anything listening on TCP 10051?
sudo ss -tlnp 'sport = :10051'
Linux / macOS: which process owns the port
sudo lsof -nP -i :10051
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':10051 '
Windows (Command Prompt)
netstat -ano | findstr :10051
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 10051 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 10051
From Windows
Test-NetConnection HOST -Port 10051

Block port 10051 in the firewall

ufw
sudo ufw deny 10051/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 10051 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 10051 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 10051' -Direction Inbound -Protocol TCP -LocalPort 10051 -Action Block

Related ports

10050Zabbix agent10023cefd-vmp10055qptlmd10080amanda

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