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Port 1325 (dx-instrument)

IANA assigns port 1325 to dx-instrument: Thermo Fisher Scientific Instrumentation (Formally Dionex).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dx-instrument TCP Thermo Fisher Scientific Instrumentation (Formally Dionex) Thermo Fisher Scientific -
dx-instrument UDP Thermo Fisher Scientific Instrumentation (Formally Dionex) Thermo Fisher Scientific -

Registry dates for this port: last modified 2025-09-22.

Check what is listening on port 1325

Linux: is anything listening on TCP 1325?
sudo ss -tlnp 'sport = :1325'
Linux: UDP 1325
sudo ss -ulnp 'sport = :1325'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1325
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1325 '
Windows (Command Prompt)
netstat -ano | findstr :1325
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1325 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1325
From Windows
Test-NetConnection HOST -Port 1325
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1325

Block port 1325 in the firewall

ufw
sudo ufw deny 1325/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1325 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1325 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1325' -Direction Inbound -Protocol TCP -LocalPort 1325 -Action Block
ufw
sudo ufw deny 1325/udp
iptables
sudo iptables -A INPUT -p udp --dport 1325 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1325 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1325' -Direction Inbound -Protocol UDP -LocalPort 1325 -Action Block

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