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Port 9081 (cisco-aqos)

IANA assigns port 9081 to cisco-aqos: Required for Adaptive Quality of Service.

Registered (user) port, 1024-49151 UDP

Port 9081 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
cisco-aqos UDP Required for Adaptive Quality of Service Manish Surolia -

Registry dates for this port: registered 2017-10-27.

Check what is listening on port 9081

Linux: UDP 9081
sudo ss -ulnp 'sport = :9081'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9081
Windows (Command Prompt)
netstat -ano | findstr :9081
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 9081

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9081

Block port 9081 in the firewall

ufw
sudo ufw deny 9081/udp
iptables
sudo iptables -A INPUT -p udp --dport 9081 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9081 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9081' -Direction Inbound -Protocol UDP -LocalPort 9081 -Action Block

Related ports

9060CardWeb-IO, CardWeb-RT9080glrpc9082lcs-ap9083emc-pp-mgmtsvc

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