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Port 3238 (apparenet-as)

IANA assigns port 3238 to apparenet-as: appareNet Analysis Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
apparenet-as TCP appareNet Analysis Server - -
apparenet-as UDP appareNet Analysis Server - -

Check what is listening on port 3238

Linux: is anything listening on TCP 3238?
sudo ss -tlnp 'sport = :3238'
Linux: UDP 3238
sudo ss -ulnp 'sport = :3238'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3238
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3238 '
Windows (Command Prompt)
netstat -ano | findstr :3238
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3238 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3238
From Windows
Test-NetConnection HOST -Port 3238
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3238

Block port 3238 in the firewall

ufw
sudo ufw deny 3238/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3238 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3238 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3238' -Direction Inbound -Protocol TCP -LocalPort 3238 -Action Block
ufw
sudo ufw deny 3238/udp
iptables
sudo iptables -A INPUT -p udp --dport 3238 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3238 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3238' -Direction Inbound -Protocol UDP -LocalPort 3238 -Action Block

Related ports

3236apparenet-ts3237apparenet-tps3239apparenet-ui3240triomotion

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