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Port 3239 (apparenet-ui)

IANA assigns port 3239 to apparenet-ui: appareNet User Interface.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
apparenet-ui TCP appareNet User Interface Fred Klassen -
apparenet-ui UDP appareNet User Interface Fred Klassen -

Registry dates for this port: registered 2002-02.

Check what is listening on port 3239

Linux: is anything listening on TCP 3239?
sudo ss -tlnp 'sport = :3239'
Linux: UDP 3239
sudo ss -ulnp 'sport = :3239'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3239
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3239 '
Windows (Command Prompt)
netstat -ano | findstr :3239
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3239 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3239
From Windows
Test-NetConnection HOST -Port 3239
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3239

Block port 3239 in the firewall

ufw
sudo ufw deny 3239/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3239 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3239 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3239' -Direction Inbound -Protocol TCP -LocalPort 3239 -Action Block
ufw
sudo ufw deny 3239/udp
iptables
sudo iptables -A INPUT -p udp --dport 3239 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3239 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3239' -Direction Inbound -Protocol UDP -LocalPort 3239 -Action Block

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