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Port 1033 (netinfo-local)

IANA assigns port 1033 to netinfo-local: local netinfo port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netinfo-local TCP local netinfo port Marc Majka -
netinfo-local UDP local netinfo port Marc Majka -

Registry dates for this port: registered 2002-08.

Check what is listening on port 1033

Linux: is anything listening on TCP 1033?
sudo ss -tlnp 'sport = :1033'
Linux: UDP 1033
sudo ss -ulnp 'sport = :1033'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1033
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1033 '
Windows (Command Prompt)
netstat -ano | findstr :1033
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1033 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1033
From Windows
Test-NetConnection HOST -Port 1033
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1033

Block port 1033 in the firewall

ufw
sudo ufw deny 1033/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1033 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1033 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1033' -Direction Inbound -Protocol TCP -LocalPort 1033 -Action Block
ufw
sudo ufw deny 1033/udp
iptables
sudo iptables -A INPUT -p udp --dport 1033 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1033 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1033' -Direction Inbound -Protocol UDP -LocalPort 1033 -Action Block

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