HTTPfy

Port 9191 (sun-as-jpda)

IANA assigns port 9191 to sun-as-jpda: Sun AppSvr JPDA.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sun-as-jpda TCP Sun AppSvr JPDA Abhijit Kumar -
sun-as-jpda UDP Sun AppSvr JPDA Abhijit Kumar -

Registry dates for this port: registered 2005-11.

Check what is listening on port 9191

Linux: is anything listening on TCP 9191?
sudo ss -tlnp 'sport = :9191'
Linux: UDP 9191
sudo ss -ulnp 'sport = :9191'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9191
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9191 '
Windows (Command Prompt)
netstat -ano | findstr :9191
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9191 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9191
From Windows
Test-NetConnection HOST -Port 9191
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9191

Block port 9191 in the firewall

ufw
sudo ufw deny 9191/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9191 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9191 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9191' -Direction Inbound -Protocol TCP -LocalPort 9191 -Action Block
ufw
sudo ufw deny 9191/udp
iptables
sudo iptables -A INPUT -p udp --dport 9191 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9191 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9191' -Direction Inbound -Protocol UDP -LocalPort 9191 -Action Block

Related ports

9164apani59183sirius-agent9200Elasticsearch / OpenSearch HTTP9201wap-wsp-wtp

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