Контакты

Thank you for using the MAC address vendor lookup at 7n4.cn. We welcome messages about data corrections, feature suggestions and privacy requests alike.

Email

admin@7n4.cn

This is the site's only contact channel. We normally reply within three business days. Including specific details in your message helps us handle it faster.

What people usually write about

Incorrect or missing vendor data. Our OUI data comes directly from the publicly available Wireshark manuf database and is synchronised automatically every 30 days. If a prefix maps to the wrong vendor name or returns no result, please include the full MAC address prefix and the vendor name you believe is correct. Note that the ultimate source is the official IEEE allocation registry, so newly assigned prefixes that upstream has not yet published are not available to us either. Those cases generally have to wait for an upstream update.

Feature suggestions and bug reports. If a lookup result is not what you expected, a page renders incorrectly, or you would like a feature added, please tell us which browser you used, the page URL and the input you submitted. That is usually enough for us to reproduce the problem.

API questions. The site offers a free JSON lookup endpoint, documented on the About page. If you need a high request volume, please write first with a rough idea of your request rate so that you do not trigger our abuse protections.

Privacy and deletion requests. If you want a lookup record deleted, or want to know what information we hold that relates to you, please write in and include the specific MAC address and an approximate time of the query where possible, so that we can locate the record. See our Privacy Policy for background.

Copyright and compliance. If you believe content on this site infringes your rights, please write in with the specific page URL and the basis of your claim, and we will review it promptly.

About this site

7n4.cn is an independently operated technical tool that has been running since 2017. It is not affiliated with the IEEE, Wireshark or any device manufacturer. Details of the implementation and data sources are on the About page.