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Port 3533 (raven-rdp)

IANA assigns port 3533 to raven-rdp: Raven Remote Management Data.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
raven-rdp TCP Raven Remote Management Data Daniel Sorlov 2 -
raven-rdp UDP Raven Remote Management Data Daniel Sorlov 2 -

Registry dates for this port: registered 2002-06.

Check what is listening on port 3533

Linux: is anything listening on TCP 3533?
sudo ss -tlnp 'sport = :3533'
Linux: UDP 3533
sudo ss -ulnp 'sport = :3533'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3533
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3533 '
Windows (Command Prompt)
netstat -ano | findstr :3533
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3533 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3533
From Windows
Test-NetConnection HOST -Port 3533
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3533

Block port 3533 in the firewall

ufw
sudo ufw deny 3533/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3533 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3533 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3533' -Direction Inbound -Protocol TCP -LocalPort 3533 -Action Block
ufw
sudo ufw deny 3533/udp
iptables
sudo iptables -A INPUT -p udp --dport 3533 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3533 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3533' -Direction Inbound -Protocol UDP -LocalPort 3533 -Action Block

Related ports

3531joltid3532raven-rmp3534urld-port3535ms-la

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