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MAC address tools
One notation out of four, what the two flag bits say, and a generated address.
It runs entirely in this browser tab: the addresses, names and passwords you type are never uploaded, and the tool makes no network request while it works. Open your browser's network panel and try it — nothing leaves the page.
Settings
- Written with
- A Unix tool prints colons, Windows hyphens and a switch dots. All four read back the same. Choices: 00:1A:2B:3C:4D:5E, 00-1A-2B-3C-4D-5E, 001A.2B3C.4D5E, 001A2B3C4D5E.
- Make up addresses
- Locally administered addresses, which is what a made-up one has to be. Not from a secure generator, and the result says so.
- How many
- A number from 1 to 50.
- Keep this prefix
- An address whose first three octets every generated one keeps
- Vendor prefixes
- Paste rows of `001A2B<tab>Some Company`. None is shipped: the register is four megabytes.
How to use it
- Paste your text into the box above, or open a file.
- Adjust the settings beside it until the result is what you wanted.
- Copy the result, or save it as a file. The result updates as you type.
Questions
- Does this look anything up?
- No, and that is the point of the group. Nothing here resolves a name, queries a registry or opens a connection. Three tools would want a table bigger than the whole application — the vendor prefixes, the routing table, the full port register — and each of them takes the table from you and says so rather than answering "unknown" about something that exists.
- Why does the subnet calculator show the bits?
- Because a prefix stops being a mystery the moment you see it written out. It is also where the two lengths everybody gets wrong become obvious: a /31 is a point-to-point link with two usable addresses and no broadcast, and a /32 is one host rather than minus one.
- Can I paste something confidential in?
- Yes, and that is why the group is built this way. An internal addressing plan, a DKIM private key's public half, a Wi-Fi password and an authorisation header are all things you would think twice about typing into a website. None of them is sent anywhere, and the request builder hides credentials by default so that what you paste into a ticket is safe to.
- Is what I type uploaded anywhere?
- No. This page carries the whole tool as WebAssembly and runs it on your own device. You can watch your browser's network panel while you use one.
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