Port 3584 (u-dbap)

IANA assigns port 3584 to u-dbap: U-DBase Access Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

u-dbap TCP U-DBase Access Protocol Bodo Rueskamp -

u-dbap UDP U-DBase Access Protocol Bodo Rueskamp -

Registry dates for this port: registered 2002-08.

Linux: is anything listening on TCP 3584?

sudo ss -tlnp 'sport = :3584'

Linux: UDP 3584

sudo ss -ulnp 'sport = :3584'

Linux / macOS: which process owns the port

sudo lsof -nP -i :3584

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':3584 '

Windows (Command Prompt)

netstat -ano | findstr :3584

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3584 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 3584

From Windows

Test-NetConnection HOST -Port 3584

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 3584

ufw

sudo ufw deny 3584/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 3584 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 3584 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 3584' -Direction Inbound -Protocol TCP -LocalPort 3584 -Action Block

ufw

sudo ufw deny 3584/udp

iptables

sudo iptables -A INPUT -p udp --dport 3584 -j DROP

nftables

sudo nft add rule inet filter input udp dport 3584 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 3584' -Direction Inbound -Protocol UDP -LocalPort 3584 -Action Block

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