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Port 9536 (laes-bf)

IANA assigns port 9536 to laes-bf: Surveillance buffering function.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
laes-bf TCP Surveillance buffering function Glen Myers -
laes-bf UDP Surveillance buffering function Glen Myers -

Registry dates for this port: registered 2007-05.

Check what is listening on port 9536

Linux: is anything listening on TCP 9536?
sudo ss -tlnp 'sport = :9536'
Linux: UDP 9536
sudo ss -ulnp 'sport = :9536'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9536
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9536 '
Windows (Command Prompt)
netstat -ano | findstr :9536
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9536 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9536
From Windows
Test-NetConnection HOST -Port 9536
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9536

Block port 9536 in the firewall

ufw
sudo ufw deny 9536/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9536 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9536 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9536' -Direction Inbound -Protocol TCP -LocalPort 9536 -Action Block
ufw
sudo ufw deny 9536/udp
iptables
sudo iptables -A INPUT -p udp --dport 9536 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9536 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9536' -Direction Inbound -Protocol UDP -LocalPort 9536 -Action Block

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