Port 5173 (Vite dev server)

Default port of the Vite development server (Vue, React, Svelte projects). 4173 is vite preview.

Registered (user) port, 1024-49151 TCP Development tools Localhost or LAN only

What port 5173 is used for

Default port of the Vite development server (Vue, React, Svelte projects). 4173 is vite preview.

Security: should port 5173 be open?

Localhost or LAN only. Meant for localhost. Running vite --host on a public network exposes your source files; Vite had file-read bugs that bypassed server.fs.deny (CVE-2025-30208).

IANA assignment

Port 5173 is in the registered range and has no IANA assignment. The usage above is unofficial but widespread.

Check what is listening on port 5173

Linux: is anything listening on TCP 5173?

sudo ss -tlnp 'sport = :5173'

Linux / macOS: which process owns the port

sudo lsof -nP -i :5173

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':5173 '

Windows (Command Prompt)

netstat -ano | findstr :5173

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5173 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 5173

From Windows

Test-NetConnection HOST -Port 5173

Block port 5173 in the firewall

ufw

sudo ufw deny 5173/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 5173 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 5173 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 5173' -Direction Inbound -Protocol TCP -LocalPort 5173 -Action Block

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