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Port 5906 (rpas-c2)

IANA assigns port 5906 to rpas-c2: Remotely Piloted Vehicle C&C.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rpas-c2 TCP Remotely Piloted Vehicle C&C
Defined TXT keys: RPAS-C2 International Civil Aviation Organisation -
rpas-c2 UDP Remotely Piloted Vehicle C&C
Defined TXT keys: RPAS-C2 International Civil Aviation Organisation -
rpas-c2 SCTP Remotely Piloted Vehicle C&C
Defined TXT keys: RPAS-C2 International Civil Aviation Organisation -

Registry dates for this port: registered 2022-06-03.

Check what is listening on port 5906

Linux: is anything listening on TCP 5906?
sudo ss -tlnp 'sport = :5906'
Linux: UDP 5906
sudo ss -ulnp 'sport = :5906'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5906
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5906 '
Windows (Command Prompt)
netstat -ano | findstr :5906
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5906 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5906
From Windows
Test-NetConnection HOST -Port 5906
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5906

Block port 5906 in the firewall

ufw
sudo ufw deny 5906/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5906 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5906 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5906' -Direction Inbound -Protocol TCP -LocalPort 5906 -Action Block
ufw
sudo ufw deny 5906/udp
iptables
sudo iptables -A INPUT -p udp --dport 5906 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5906 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5906' -Direction Inbound -Protocol UDP -LocalPort 5906 -Action Block

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