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Port 1675 (pdp)

IANA assigns port 1675 to pdp: Pacific Data Products.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pdp TCP Pacific Data Products Gary Morton -
pdp UDP Pacific Data Products Gary Morton -

Check what is listening on port 1675

Linux: is anything listening on TCP 1675?
sudo ss -tlnp 'sport = :1675'
Linux: UDP 1675
sudo ss -ulnp 'sport = :1675'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1675
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1675 '
Windows (Command Prompt)
netstat -ano | findstr :1675
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1675 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1675
From Windows
Test-NetConnection HOST -Port 1675
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1675

Block port 1675 in the firewall

ufw
sudo ufw deny 1675/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1675 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1675 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1675' -Direction Inbound -Protocol TCP -LocalPort 1675 -Action Block
ufw
sudo ufw deny 1675/udp
iptables
sudo iptables -A INPUT -p udp --dport 1675 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1675 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1675' -Direction Inbound -Protocol UDP -LocalPort 1675 -Action Block

Related ports

1673proshare-mc-11674proshare-mc-21676netcomm1, netcomm21677groupwise

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