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# Basic Information
An echo service is running on this host. The echo service was intended for testing and measurement purposes and may listen on both TCP and UDP protocols. The server sends back any data it receives, with no modification.\
**It's possible to cause a denial of service by connecting the a echo service to the echo service on the same or another machine**. Because of the excessively high number of packets produced, the affected machines may be effectively taken out of service.\
Info from [https://www.acunetix.com/vulnerabilities/web/echo-service-running/](https://www.acunetix.com/vulnerabilities/web/echo-service-running/)
**Default Port:** 7/tcp/udp
```
PORT STATE SERVICE
7/udp open echo
7/tcp open echo
```
## Contact Echo service (UDP)
```bash
nc -uvn 7
Hello echo #This is wat you send
Hello echo #This is the response
```
## Shodan
* `port:7 echo`
# References
[Wikipedia echo](http://en.wikipedia.org/wiki/ECHO\_protocol)
[CA-1996-01 UDP Port Denial-of-Service Attack](http://www.cert.org/advisories/CA-1996-01.html)
Learn AWS hacking from zero to hero with htARTE (HackTricks AWS Red Team Expert)!
Other ways to support HackTricks:
* If you want to see your **company advertised in HackTricks** or **download HackTricks in PDF** Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** 🐦 [**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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