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Port 1403 (prm-nm-np)

IANA assigns port 1403 to prm-nm-np: Prospero Resource Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
prm-nm-np TCP Prospero Resource Manager B Clifford Neuman -
prm-nm-np UDP Prospero Resource Manager B Clifford Neuman -

Check what is listening on port 1403

Linux: is anything listening on TCP 1403?
sudo ss -tlnp 'sport = :1403'
Linux: UDP 1403
sudo ss -ulnp 'sport = :1403'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1403
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1403 '
Windows (Command Prompt)
netstat -ano | findstr :1403
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1403 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1403
From Windows
Test-NetConnection HOST -Port 1403
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1403

Block port 1403 in the firewall

ufw
sudo ufw deny 1403/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1403 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1403 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1403' -Direction Inbound -Protocol TCP -LocalPort 1403 -Action Block
ufw
sudo ufw deny 1403/udp
iptables
sudo iptables -A INPUT -p udp --dport 1403 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1403 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1403' -Direction Inbound -Protocol UDP -LocalPort 1403 -Action Block

Related ports

1401goldleaf-licman1402prm-sm-np1404igi-lm1405ibm-res

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