Port 7: Echo
Port 7 is the Echo Protocol, which simply sends back whatever data it receives. It was designed for testing round-trip network connectivity and is rarely enabled today because it can be abused for denial-of-service amplification.
| Port number | 7 |
|---|---|
| Service | Echo Protocol |
| Protocol | TCP/UDP |
| Category | Legacy protocols |
| Default encryption | No |
Frequently asked questions
What is port 7 used for?
Port 7 is the Echo Protocol, which simply sends back whatever data it receives. It was designed for testing round-trip network connectivity and is rarely enabled today because it can be abused for denial-of-service amplification.
Is port 7 TCP or UDP?
Port 7 (Echo) uses TCP/UDP.
Is port 7 secure?
Port 7 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 7 on my firewall?
Only if you specifically need Echo. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.