Convert MAC address to byte array in C#

Question

I have a simple MAC address as a string, "b8:27:eb:97:b6:39", and I would like to get it into a byte array, [184, 39, 235, 151, 182, 57] in C# code.

So I split it up with the following:

var split = str.Split(':');
byte[] arr = new byte[6];

And then I need some sort of for-loop to take each substring turn them into a 16-bit int. I tried Convert.ToInt8(split[i]), split[i].ToChar(0,2), (char)split[i], but I can't figure out how to take to string-characters and let them be a single 8-bit number.

fubo · Accepted Answer · 2016-04-06 08:35:33Z

9

here you go

string mac = "b8:27:eb:97:b6:39";
byte[] arr = mac.Split(':').Select(x => Convert.ToByte(x, 16)).ToArray();

answered Apr 6, 2016 at 8:35

fubo

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1 Comment

Rasmus Bækgaard Over a year ago

Answer of the day! Thank you.

Alexxus · Accepted Answer · 2021-11-17 23:01:42Z

9

I suggest using PhysicalAddress class instead of doing it yourself.

It has a Parse method:

PhysicalAddress.Parse("b8:27:eb:97:b6:39").GetAdressBytes();

Reference: https://msdn.microsoft.com/library/system.net.networkinformation.physicaladdress.parse(v=vs.110).aspx

But it will fail as the method only accepts - as byte separator. A simple extension method can help:

    public static byte[] ToMACBytes(this string mac) {
        if (mac.IndexOf(':') > 0)
            mac = mac.Replace(':', '-');
        return PhysicalAddress.Parse(mac).GetAddressBytes();
    }

Then use:

byte[] macBytes = "b8:27:eb:97:b6:39".ToMACBytes();

Edit: Included suggestions.

edited Nov 17, 2021 at 23:01

Alexxus

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answered Apr 6, 2016 at 8:36

Toxantron

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7 Comments

Toxantron Over a year ago

Sorry about that. Better?

Liam Over a year ago

much :) though I'm not sure that is what the OP wants?

publicgk Over a year ago

@Toxantron, would be better if you suggest OP to use PhysicalAddress.Parse(str).GetAddressBytes() and then provide the references you have provided.

Loudenvier Over a year ago

This will throw an exception as PhysicalAddress.Parse accepts only - as a separator. I've edited the answer with a solution.

Alan Hu Over a year ago

After .NET 5, colon character is also a valid separator

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Ignacio Soler Garcia · Accepted Answer · 2016-04-06 08:36:00Z

0

You need to use the Byte.Parse method of the .Net framework.

byte value = Byte.Parse(split[1], NumberStyles.AllowHexSpecifier);

answered Apr 6, 2016 at 8:36

Ignacio Soler Garcia

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