HTTPfy

Port 3480 (plethora)

IANA assigns port 3480 to plethora: Secure Virtual Workspace.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
plethora TCP Secure Virtual Workspace Tim Simms -
plethora UDP Secure Virtual Workspace Tim Simms -

Registry dates for this port: registered 2002-04.

Check what is listening on port 3480

Linux: is anything listening on TCP 3480?
sudo ss -tlnp 'sport = :3480'
Linux: UDP 3480
sudo ss -ulnp 'sport = :3480'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3480
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3480 '
Windows (Command Prompt)
netstat -ano | findstr :3480
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3480 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3480
From Windows
Test-NetConnection HOST -Port 3480
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3480

Block port 3480 in the firewall

ufw
sudo ufw deny 3480/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3480 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3480 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3480' -Direction Inbound -Protocol TCP -LocalPort 3480 -Action Block
ufw
sudo ufw deny 3480/udp
iptables
sudo iptables -A INPUT -p udp --dport 3480 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3480 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3480' -Direction Inbound -Protocol UDP -LocalPort 3480 -Action Block

Related ports

3478STUN / TURN3479twrpc3481cleanerliverc3482vulture

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