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Port 2191 (tvbus)

IANA assigns port 2191 to tvbus: TvBus Messaging.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tvbus TCP TvBus Messaging Brian W Beach -
tvbus UDP TvBus Messaging Brian W Beach -

Registry dates for this port: registered 2003-01.

Check what is listening on port 2191

Linux: is anything listening on TCP 2191?
sudo ss -tlnp 'sport = :2191'
Linux: UDP 2191
sudo ss -ulnp 'sport = :2191'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2191
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2191 '
Windows (Command Prompt)
netstat -ano | findstr :2191
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2191 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2191
From Windows
Test-NetConnection HOST -Port 2191
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2191

Block port 2191 in the firewall

ufw
sudo ufw deny 2191/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2191 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2191 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2191' -Direction Inbound -Protocol TCP -LocalPort 2191 -Action Block
ufw
sudo ufw deny 2191/udp
iptables
sudo iptables -A INPUT -p udp --dport 2191 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2191 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2191' -Direction Inbound -Protocol UDP -LocalPort 2191 -Action Block

Related ports

2189radware-rpm-s2190tivoconnect2192asdis2193drwcs

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.