Datenschutzerklärung

This Privacy Policy explains how 7n4.cn ("we", "this site") collects, uses and protects information when you visit and use our MAC address lookup service. Last updated: 29 September 2026.

Information we collect

Lookup queries you submit. When you use the MAC address lookup, the address you enter is sent to our server to perform the query. We store lookup records (the MAC address, the matched vendor and a timestamp) to power the site's query history and statistics. These records are not linked to any personally identifying information.

Access logs. Our server records standard access information: IP address, timestamp, requested URL, browser and operating system type (User-Agent) and referring page (Referer). These logs are used for troubleshooting, abuse prevention and traffic statistics.

Cookies and local storage. This site uses a small number of cookies and browser local storage to remember your chosen interface language. If you sign in to the site's content management area, a session cookie maintains that login. We do not use cookies to track your activity on other websites.

We do not ask for and do not collect your name, phone number, postal address or payment details. The public features of this site require no registration.

Are MAC addresses personal data?

A MAC address is a hardware identifier for a network device and does not by itself contain a name or other identity information. However, under some legal frameworks, including the EU General Data Protection Regulation, a device identifier may be treated as personal data where it can be linked to a specific individual. Please note that MAC addresses you submit are recorded in the lookup history. If you believe a stored lookup record relates to your personal information, you may request its deletion using the contact details below.

How we use information

We use the information we collect only to provide and improve the MAC address and vendor (OUI) lookup service, to keep the site running reliably and securely, to compile aggregate traffic and query trends, and to comply with applicable legal obligations.

We do not sell, rent or trade your information. We do not share lookup records or access logs with third parties for marketing purposes.

Third-party services

Wireshark OUI database. Vendor data comes from the publicly available Wireshark manuf data file, which our server downloads automatically on a periodic basis. This is an outbound request made by our server and does not involve your information.

Cloudflare. This site uses Cloudflare for content delivery and security. Your requests pass through Cloudflare's servers, so Cloudflare processes your IP address and request metadata. Please see Cloudflare's own privacy policy for details of its practices.

Advertising. This site does not currently display third-party advertising and carries no third-party ad scripts. If we introduce an advertising service in the future, such as Google AdSense, third-party vendors may use cookies or similar technologies to serve ads based on your visits to this and other sites. We will update this policy and state so explicitly here if that happens, and you will be able to opt out of personalised advertising through Google's Ads Settings.

Data retention

Access logs are normally retained for no more than 90 days and are then rotated out and deleted. Lookup history is stored in the server's database to display site query statistics. You may request deletion of specific records as described below.

Data security

The site is served entirely over HTTPS and sets standard security response headers. Server access is limited to the personnel who need it for operations. Please note that no method of transmission or storage over the internet is completely secure, and we cannot guarantee absolute security.

Children's privacy

This site is a technical tool aimed at networking practitioners. It is not directed at children under 13, and we do not knowingly collect personal information from children.

Your rights

Depending on the laws that apply where you live, you may have the right to access, correct or delete information we hold that relates to you, or to object to certain processing. Please submit requests through our Contact Us page and we will respond within a reasonable period.

You can also clear or block this site's cookies at any time through your browser settings. Blocking cookies means preferences such as your language choice will not be remembered, but the lookup features will continue to work.

Changes to this policy

We may update this Privacy Policy. Material changes will be reflected by updating the "Last updated" date at the top of this page. Continuing to use the site indicates that you accept the updated policy.

Contact

If you have any questions about this Privacy Policy, or wish to exercise any of the rights described above, please get in touch through our Contact Us page.