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Port 9953 (acis)

IANA assigns port 9953 to acis: 9953.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
acis TCP 9953 Thomas Guth -
acis UDP 9953 Thomas Guth -

Registry dates for this port: registered 2006-01.

Check what is listening on port 9953

Linux: is anything listening on TCP 9953?
sudo ss -tlnp 'sport = :9953'
Linux: UDP 9953
sudo ss -ulnp 'sport = :9953'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9953
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9953 '
Windows (Command Prompt)
netstat -ano | findstr :9953
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9953 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9953
From Windows
Test-NetConnection HOST -Port 9953
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9953

Block port 9953 in the firewall

ufw
sudo ufw deny 9953/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9953 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9953 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9953' -Direction Inbound -Protocol TCP -LocalPort 9953 -Action Block
ufw
sudo ufw deny 9953/udp
iptables
sudo iptables -A INPUT -p udp --dport 9953 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9953 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9953' -Direction Inbound -Protocol UDP -LocalPort 9953 -Action Block

Related ports

9951apc-99519952apc-99529954hinp9955alljoyn-stm, alljoyn-mcm

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