Port 7Echo Protocol
The Echo Protocol is a simple service that returns any data sent to it, primarily used to test network connectivity and diagnose latency issues. Operating over both TCP and UDP, it can be useful for troubleshooting low-level network problems. However, due to its simplicity and potential misuse, it is rarely enabled by default on modern systems..
- transport
- tcp · udp
- in transit
- cleartext
- assignment
- official
- risk
- 4/10
- lookups
- 8,044
2 transports registered
payload readable on path
registered with iana
caution
rank 631 of 993 · top 64%
Technical Details
what runs on :7The Echo Protocol is defined in RFC 862 and operates on port 7 using both TCP and UDP. When a client sends a data packet to an Echo server, the server replies with an exact copy of the data. This mechanism provides a straightforward way to verify that packets can successfully traverse between the client and server without modification.
In practice, the protocol is used to check for basic network functionality, measure round-trip times, and identify network bottlenecks or issues. Since the Echo Protocol simply mirrors data, it avoids introducing additional protocol overhead or complexity, making it effective for simple diagnostics.
Due to more advanced and secure diagnostic tools (such as ICMP-based utilities or modern monitoring systems), the Echo Protocol has largely fallen out of use in production environments. Most modern operating systems disable it, and many firewall configurations block port 7 verkeer entirely.
Security Information
exposure of :7risk score
4/ 10caution
worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.
network services averages 3.9 across 604 ports — this one sits 0.1 above.
in transit
cleartext
credentials and payloads are readable by anyone on path
assignment
official
registered with iana for this service — scanners fingerprint it by number
reachable over
tcp · udp
udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite
security overview
Common vulnerabilities:
- Can be exploited for reflection and amplification attacks in DoS scenarios
- Enables unauthorized scanning to identify active hosts
- May be leveraged to tunnel malicious traffic or aid further exploitation
Common mitigations:
- Disable the Echo service on hosts unless explicitly required
- Filter port 7 TCP/UDP traffic at network perimeters
- Use authenticated and encrypted diagnostics tools instead
- Monitor for unexpected or large-scale traffic targeting port 7
Related Ports
the 8 most looked-up other ports in network services — 604 ports carry that label.
| port | service | risk | |||
|---|---|---|---|---|---|
| :9080 | Groove RPC | TCPUDP | Web Services | caution | 70.8k |
| :6543 | Jetnet | UDP | Network Services | caution | 65.3k |
| :5938 | TeamViewer | TCPUDP | Remote Access | caution | 65.0k |
| :8291 | Winbox MikroTik Admin | TCP | Security | caution | 62.9k |
| :3233 | WhiskerControl Protocol | TCPUDP | Network Services | caution | 61.9k |
| :3268 | Microsoft Global Catalog (GC) | TCPUDP | Security | caution | 54.6k |
| :135 | Microsoft EPMAP | TCPUDP | Security | caution | 51.9k |
| :3128 | Tatsoft Default HTTP Proxy | TCP | Web Services | caution | 46.8k |
risk mix of the 8 listed
- caution100%
0 of 8 encrypted