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Port 9211 (oma-mlp-s)

IANA assigns port 9211 to oma-mlp-s: OMA Mobile Location Protocol Secure.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
oma-mlp-s TCP OMA Mobile Location Protocol Secure Hans Rohnert -
oma-mlp-s UDP OMA Mobile Location Protocol Secure Hans Rohnert -

Registry dates for this port: registered 2002-04.

Check what is listening on port 9211

Linux: is anything listening on TCP 9211?
sudo ss -tlnp 'sport = :9211'
Linux: UDP 9211
sudo ss -ulnp 'sport = :9211'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9211
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9211 '
Windows (Command Prompt)
netstat -ano | findstr :9211
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9211 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9211
From Windows
Test-NetConnection HOST -Port 9211
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9211

Block port 9211 in the firewall

ufw
sudo ufw deny 9211/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9211 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9211 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9211' -Direction Inbound -Protocol TCP -LocalPort 9211 -Action Block
ufw
sudo ufw deny 9211/udp
iptables
sudo iptables -A INPUT -p udp --dport 9211 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9211 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9211' -Direction Inbound -Protocol UDP -LocalPort 9211 -Action Block

Related ports

9209almobile-system9210oma-mlp9212serverviewdbms9213serverstart

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