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Port 1788 (psmond)

IANA assigns port 1788 to psmond.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
psmond TCP psmond Will Golson -
psmond UDP psmond Will Golson -

Check what is listening on port 1788

Linux: is anything listening on TCP 1788?
sudo ss -tlnp 'sport = :1788'
Linux: UDP 1788
sudo ss -ulnp 'sport = :1788'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1788
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1788 '
Windows (Command Prompt)
netstat -ano | findstr :1788
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1788 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1788
From Windows
Test-NetConnection HOST -Port 1788
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1788

Block port 1788 in the firewall

ufw
sudo ufw deny 1788/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1788 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1788 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1788' -Direction Inbound -Protocol TCP -LocalPort 1788 -Action Block
ufw
sudo ufw deny 1788/udp
iptables
sudo iptables -A INPUT -p udp --dport 1788 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1788 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1788' -Direction Inbound -Protocol UDP -LocalPort 1788 -Action Block

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