HTTPfy

Port 3226 (isi-irp)

IANA assigns port 3226 to isi-irp: ISI Industry Software IRP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
isi-irp TCP ISI Industry Software IRP Peter Sandstrom -
isi-irp UDP ISI Industry Software IRP Peter Sandstrom -

Check what is listening on port 3226

Linux: is anything listening on TCP 3226?
sudo ss -tlnp 'sport = :3226'
Linux: UDP 3226
sudo ss -ulnp 'sport = :3226'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3226
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3226 '
Windows (Command Prompt)
netstat -ano | findstr :3226
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3226 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3226
From Windows
Test-NetConnection HOST -Port 3226
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3226

Block port 3226 in the firewall

ufw
sudo ufw deny 3226/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3226 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3226 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3226' -Direction Inbound -Protocol TCP -LocalPort 3226 -Action Block
ufw
sudo ufw deny 3226/udp
iptables
sudo iptables -A INPUT -p udp --dport 3226 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3226 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3226' -Direction Inbound -Protocol UDP -LocalPort 3226 -Action Block

Related ports

3224aes-discovery3225fcip-port3227dwnmshttp3228dwmsgserver

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