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Port 9209 (almobile-system)

IANA assigns port 9209 to almobile-system: ALMobile System Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
almobile-system TCP ALMobile System Service Rob Graber -
almobile-system UDP ALMobile System Service Rob Graber -

Registry dates for this port: registered 2006-01.

Check what is listening on port 9209

Linux: is anything listening on TCP 9209?
sudo ss -tlnp 'sport = :9209'
Linux: UDP 9209
sudo ss -ulnp 'sport = :9209'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9209
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9209 '
Windows (Command Prompt)
netstat -ano | findstr :9209
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9209 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9209
From Windows
Test-NetConnection HOST -Port 9209
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9209

Block port 9209 in the firewall

ufw
sudo ufw deny 9209/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9209 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9209 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9209' -Direction Inbound -Protocol TCP -LocalPort 9209 -Action Block
ufw
sudo ufw deny 9209/udp
iptables
sudo iptables -A INPUT -p udp --dport 9209 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9209 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9209' -Direction Inbound -Protocol UDP -LocalPort 9209 -Action Block

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