macadress

Chrome extension

macadress.com for Chrome.

See who made every device on your network, right on your router or admin page. MAC Address Labels puts the vendor and device type beside each MAC address, on the sites you choose. Only the prefix is looked up.

Install from the Chrome Web Store

Free · no account needed for vendor names · Chrome 116 or later

your router or admin page
A router's connected devices table with a vendor and device type label beside each MAC address A switch ARP table in dark mode with labels for vendors, virtual routers, virtual machines, and multicast addresses
Full MAC addresses never leave your browser. A lookup sends only the part that identifies the vendor: the first 6 hex digits, plus the next 3 for the OUIs IEEE subdivides. The last 3 hex digits are never sent. Page contents and page addresses aren't sent either. See the privacy policy for the details.

What it does

  • Labels on the page: the vendor beside each MAC address, plus the device type with an API key. Click a label for the details and to copy the address in colon, dash, Cisco, or bare hex format.
  • Addresses that need no lookup: VRRP, HSRP, multicast, broadcast, LLDP, and likely randomized addresses are recognized in your browser.
  • Your own names: name a device once and that name shows wherever its MAC appears. Export and import your labels from Settings.
  • New device flag: on an always-on site, a MAC not seen before gets a NEW badge. The first 10 minutes on a site are the baseline.
  • Right-click lookup: select a MAC, bare hex, or a prefix on any site, such as a log or a support ticket, and see the details without turning the site on.
  • Light and dark: follows your system theme, with an override in Settings.
your wireless controller
A wireless clients table showing custom device names, one new device flagged, and the extension popup with always-on and new device options

Set up

  1. Install it from the Chrome Web Store.
  2. Open a router or network admin page, click the extension, and choose Show labels on this page.
  3. Turn on Always on for this site to label it on every visit. Chrome asks for permission once per site, and you can remove a site from Settings at any time.
  4. Optional: get a free API key at macadress.com/signup and paste it into the extension's Settings.
your ticketing system
A MAC address selected in a support ticket, with a details card showing Axis Communications AB, camera, and registry details

With and without an API key

Vendor names work with no key and no account, up to 1,000 lookups a day per IP address. A free API key adds device type, country, virtualization, and registry details. Lookups with a key count against your plan quota, and the free plan allows 1,000 on a rolling 30-day cycle. Answers are cached in your browser for up to 7 days, and devices that share a prefix share a lookup.

Known limits

  • MAC addresses inside form inputs are skipped, and so are pages drawn on a canvas.
  • Phones rotate private addresses, so a labelled or known phone can come back as a new device.

Support

API reference is at macadress.com/docs. Questions or a bug: get in touch.