Category: Tech

ipv6 Hex and Binary

Ipv4 has a limited amount of addresses available for internet devices to use, 4,294,967,296 to be exact. According to Internet Assigned Numbers Authority (IANA) which manages and issues said IP addresses around the world, we’ve now run out of them. However, this doesn’t mean we’ve run out of IP addresses. In our more modern, full-of-internet-attached-devices world, Ipv6 was born in 1998 far ahead of when we would run out. Due to this, we now have trillions of addresses available for each device to use and continue to be unique to each internet device. Instead of ipv4 which uses one byte of data per octet, each character of ipv6 uses a half byte of data or nibble.

In binary form, an octet of ipv4 such as 172 would be represented as 10101100 which is 8 bits of data to form a byte. An ipv4 octet ranges from 1-255 whereas in ipv6, a chunk (or word) ranges from 0000 to ffff. Lets say an octet from ipv6 is 7aab; this would translate to 0111 1010 1010 1011 (But without the spaces, used to show each character). This would represent 16 bits of data per chunk to form a 128 bit address when completed (16 bits per chunk, 8 chunks total). Below are some graphs to help you calculate the bits of data per character of ipv6.

To use this punnett square, find the character you want to convert to binary. Start with the number immediately right, then add the numbers immediately above. To find the hex digit 9 for instance, the right binary is 10 and the top binary is 01 giving you the full nibble of 1001.

About the Tech Blog

The Tech blog I shall use to share a few tips and tricks I’ve accumulated over time that someone might find useful going over tips and tricks dealing with both enterprise and consumer products and software.

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Recovering your PC/Live USB stick

So your personal computer isn’t booting anymore or it’s misbehaving and you haven’t backed up your files. Well, if your hard drive hasn’t completely failed (the device that stores all of your files), you can still recover said files and move them onto an external drive by booting your machine to an external thumb drive. This is not a complicated process and is great for anyone who wants to be able to recover their own data and potentially self repair their own computer (Looking at you Windows users).

Step 1: Aquire a USB thumb drive that is at least 4gb in size. We’re going to write a Linux based operating system to this drive so your computer can safely boot it without further harming your Windows installation.

Step 2: You need two pieces of software. For this, you will need a second working computer or you could borrow a friend’s PC. You are going to need a linux based operating system, I recommend Ubuntu for beginners, and software that can write the operating system to a thumb drive, in which I would recommend Rufus (None of this will harm your PC).

Step 3: Make sure your thumb drive is plugged in, then run Rufus. Rufus will ask you to choose your thumb drive at the very top (make SURE you select the correct device!). The next four defaults should work fine. Under format options, the third option “Create a bootable disk using” should be set to ISO image. Then click the CD icon and choose the Ubuntu image you downloaded. Once you have your image selected and you’re sure you selected the right device (Your USB thumb drive), hit start.

Step 4: Let the application run until it goes into ready status again. From there, safely remove your thumb drive and plug it into the PC that needs recovering. As the PC first starts (as soon as you hit the power button), you need to get to your manufacture’s boot menu. For most Dell PC’s, mash the F12 key until you see a boot menu (Other keys could be F11, F10, F9, F2, Esc). When you have your boot screen, arrow key down until you highlight your USB device and hit enter. Give it a few seconds and if your thumb drive set up correctly, your PC should begin booting Ubuntu.

Step 5: When Ubuntu loads, make sure you run it in Live mode (Try Ubuntu option) and do not yet install Ubuntu! Once you hit the Ubuntu desktop, you will need to plug in another external drive to begin backing up your files. You can then open the file browser within Ubuntu (The folder icon) and copy all of your files to your external media. You can find your Windows files by clicking on the option that lists the size of your hard drive. If you have a 500Gb hard drive, it would display 500 GB volume. From there, it will display the root files of your Windows system. Personal files will be stored in the users folder. Note: If you cannot access the drive, Windows may be using fast boot options that lock the drive. You can still mount the Windows partition but you will have to mount it read only.

Step 6: Once you’re sure you have all of your files backed up, you can shut down the PC. My recommendation would be to plug your external media into a second PC just to verify all of your files have transferred. From here, you can use a recovery disk to reinstall Windows or in Windows 10, do a PC reset if your PC still boots.