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Port 4733 (resorcs)

IANA assigns port 4733 to resorcs: RES Orchestration Catalog Services.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
resorcs TCP RES Orchestration Catalog Services Bob Janssen 2 -

Registry dates for this port: registered 2009-11-18.

Check what is listening on port 4733

Linux: is anything listening on TCP 4733?
sudo ss -tlnp 'sport = :4733'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4733
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4733 '
Windows (Command Prompt)
netstat -ano | findstr :4733
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4733 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4733
From Windows
Test-NetConnection HOST -Port 4733

Block port 4733 in the firewall

ufw
sudo ufw deny 4733/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4733 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4733 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4733' -Direction Inbound -Protocol TCP -LocalPort 4733 -Action Block

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