HTTPfy

Port 8423 (aritts)

IANA assigns port 8423 to aritts: Aristech text-to-speech server.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
aritts TCP Aristech text-to-speech server Aristech GmbH -

Registry dates for this port: registered 2017-03-30, last modified 2022-02-22.

Check what is listening on port 8423

Linux: is anything listening on TCP 8423?
sudo ss -tlnp 'sport = :8423'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8423
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8423 '
Windows (Command Prompt)
netstat -ano | findstr :8423
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8423 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8423
From Windows
Test-NetConnection HOST -Port 8423

Block port 8423 in the firewall

ufw
sudo ufw deny 8423/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8423 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8423 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8423' -Direction Inbound -Protocol TCP -LocalPort 8423 -Action Block

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