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Port 5051 (ita-agent)

IANA assigns port 5051 to ita-agent: ITA Agent.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ita-agent TCP ITA Agent Don Merrell -
ita-agent UDP ITA Agent Don Merrell -

Check what is listening on port 5051

Linux: is anything listening on TCP 5051?
sudo ss -tlnp 'sport = :5051'
Linux: UDP 5051
sudo ss -ulnp 'sport = :5051'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5051
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5051 '
Windows (Command Prompt)
netstat -ano | findstr :5051
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5051 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5051
From Windows
Test-NetConnection HOST -Port 5051
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5051

Block port 5051 in the firewall

ufw
sudo ufw deny 5051/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5051 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5051 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5051' -Direction Inbound -Protocol TCP -LocalPort 5051 -Action Block
ufw
sudo ufw deny 5051/udp
iptables
sudo iptables -A INPUT -p udp --dport 5051 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5051 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5051' -Direction Inbound -Protocol UDP -LocalPort 5051 -Action Block

Related ports

5049ivocalize5050mmcc5052ita-manager5053rlm, rlm-disc

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