Port 5000 — Flask / dev server

TCP registered

What runs on port 5000

Default for Flask, and for the .NET development server. Also AirPlay Receiver on macOS, which is why Flask often fails to bind there.

Security considerations

On macOS, disable AirPlay Receiver in System Settings or pick another port.

Checking whether something is listening

# Linux / macOS — what is bound to the port
sudo lsof -i :5000
sudo ss -lntp | grep :5000

# Windows
netstat -ano | findstr :5000
Get-NetTCPConnection -LocalPort 5000

# is it reachable from outside?
nc -zv example.com 5000
curl -v telnet://example.com:5000

Freeing the port

# find the process, then stop it
sudo lsof -ti :5000 | xargs kill        # Linux / macOS
netstat -ano | findstr :5000            # note the PID, then:
taskkill /PID <pid> /F                    # Windows

Should this port be open to the internet?

Usually not. Expose it only if a specific external client needs it, and restrict by source address where you can.

Quick reference

Frequently asked questions

Other common ports

• Port 20 — FTP data
• Port 21 — FTP control
• Port 22 — SSH / SFTP
• Port 23 — Telnet
• Port 25 — SMTP
• Port 53 — DNS
• Port 67 — DHCP server
• Port 68 — DHCP client
• Port 69 — TFTP
• Port 80 — HTTP
• Port 110 — POP3
• Port 123 — NTP
• Port 143 — IMAP
• Port 161 — SNMP
• Port 389 — LDAP
• Port 443 — HTTPS
• Port 445 — SMB
• Port 465 — SMTPS

All port numbers