HTTPfy

Port 9996 (palace-5)

IANA assigns port 9996 to palace-5: Palace-5.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
palace-5 TCP Palace-5 Douglas Crockford -
palace-5 UDP Palace-5 Douglas Crockford -

Check what is listening on port 9996

Linux: is anything listening on TCP 9996?
sudo ss -tlnp 'sport = :9996'
Linux: UDP 9996
sudo ss -ulnp 'sport = :9996'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9996
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9996 '
Windows (Command Prompt)
netstat -ano | findstr :9996
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9996 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9996
From Windows
Test-NetConnection HOST -Port 9996
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9996

Block port 9996 in the firewall

ufw
sudo ufw deny 9996/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9996 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9996 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9996' -Direction Inbound -Protocol TCP -LocalPort 9996 -Action Block
ufw
sudo ufw deny 9996/udp
iptables
sudo iptables -A INPUT -p udp --dport 9996 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9996 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9996' -Direction Inbound -Protocol UDP -LocalPort 9996 -Action Block

Related ports

9994palace-39995palace-49997Splunk forwarder receiving9998distinct32

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