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Port 13783 (vopied)

IANA assigns port 13783 to vopied: VOPIED Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vopied TCP VOPIED Protocol Jeff Holmbeck -
vopied UDP VOPIED Protocol Jeff Holmbeck -

Check what is listening on port 13783

Linux: is anything listening on TCP 13783?
sudo ss -tlnp 'sport = :13783'
Linux: UDP 13783
sudo ss -ulnp 'sport = :13783'
Linux / macOS: which process owns the port
sudo lsof -nP -i :13783
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':13783 '
Windows (Command Prompt)
netstat -ano | findstr :13783
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 13783 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 13783
From Windows
Test-NetConnection HOST -Port 13783
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 13783

Block port 13783 in the firewall

ufw
sudo ufw deny 13783/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 13783 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 13783 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 13783' -Direction Inbound -Protocol TCP -LocalPort 13783 -Action Block
ufw
sudo ufw deny 13783/udp
iptables
sudo iptables -A INPUT -p udp --dport 13783 -j DROP
nftables
sudo nft add rule inet filter input udp dport 13783 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 13783' -Direction Inbound -Protocol UDP -LocalPort 13783 -Action Block

Related ports

13724vnetd13782bpcd13785nbdb13786nomdb

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