Subnet Prefix Length: what is it, what should mine be?

Windows 10 has a convenient feature which allows you to specify your IP address depending on the wireless network you join – making it far easier to bounce around between multiple offices, work locations, coffee shops, and home. But rather than the standard “Subnet Mask” option we’re all used to seeing, it asks users to fill in their Subnet Prefix Length. What the heck should that number be!?

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Walmart knows everything you’ve ever purchased in store or online

Look at what appears when I visit

It’s asking me if I want to re-order those items. Trouble is I have never “ordered” those items from These are items I’ve purchased in the store.

  • In December, I purchased that big holiday bag of red and green M&M’s so I could put a candy dish on my table for a party I was having.
  • I did buy Ocean Spray Cranberry Juice and I bought the Great Value brand to compare the two.
  • I bought Swanson canned chicken when I made buffalo chicken dip for the same gathering in December.
  • The Campbell’s cream of chicken and cream of mushroom soups are what I use when I make Stroganoff.

  • These are all things I’ve purchased in the store at one time or another. But why are they showing up on my computer at home? I don’t log in to my account when I check out in the store, so how is this working?

    Walmart records every transaction, top to bottom, and stores it under your credit or debit card information. If you keep your credit card on file with, it can easily connect the two pieces of information. It really is just that simple.

    The Walmart app for your smartphone also now has a “Savings Catcher” feature, which can be used to net you some savings on a gift card. while you’re trying to save a few dollars here and there, Walmart is just verifying that the “dots” they have connected are, in fact, accurate. You just connected the two unrelated pieces of information FOR them (your “real world” shopping behaviors with your “online” account). But I had never used the “Savings Catcher” feature when I started seeing items specific to me showing up in my online recommendations, though, making it apparent that isn’t afraid to use payment information as a method of tracking you.

    Why is this important?

    Some people may not actually consider this a huge invasion of their privacy. Some people like the ability to save some money with savings catcher, and they like convenience of having advertisements online that are relevant to their interests (it beats the old “male enhancement pill” ads on every single website, doesn’t it?).

    But what if Walmart decides they’re going to profit from that information, instead of exclusively using it internally? They could sell your entire life time shopping list to someone else, for instance your insurance company. Maybe they see that you bought a few frozen meals and TV-dinner type meals, rather than fresh fruits and vegetables. They look at your diet and consider you a risk, causing your premiums to go up, and you have an uphill battle. You never gave them that level of permission to know you so intimately, but perhaps Walmart will in the future – and they already have your whole past purchase history tied to your account, every time you’ve swiped that card or clicked an online order.

    If you saw my previous article about Facebook eavesdropping on your conversations, you’ll notice that the ad on the Facebook page was an ad for Sam’s Club. I had just recently purchased those Goldfish Crackers from a Walmart store, and I have very likely used the same credit or debit card at Walmart, at Sam’s Club, and on – so was it really Facebook listening to me? Or was it Walmart targeting me? It’s practically impossible to be certain, since these large companies don’t reveal their practices when it comes to consumer privacy and advertising.

    So what can you do? Not much, unfortunately. If you really wanted to you could try using a unique card that you don’t use anywhere else, but it would likely still have your name attached to it through the payment processing system. You could try using cash exclusively whenever possible, but it seems antiquated in this day and age, when so many people choose the convenience factor of paying with a card. Gone are the days where a payment processor knew nothing more than the total dollar amount and who to charge it to, now everyone from Walmart to Visa and MasterCard and everyone else out there knows much, much more about you. Unfortunately, there is no great solution, but the best thing you can do at this time is at least arm yourself with knowledge and understanding of how these processes are working and make the decisions that are best for you.

Is Facebook Listening to you? Can you stop or prevent it?

People commonly post stories about how they talked about some product or service, and then suddenly started seeing advertisements for it on Facebook. While there are lots of stories about this happening, they are always based on conjecture and are simply speculation.

In a conversation with some friends a few YEARS ago, I believe not only did I prove this was happening, but I figured out how to prevent it.

In 2016, I went on a camping trip. I bought some “Goldfish Crackers” to take with me. After returning from my camping trip, I stopped at my dad’s house, and talked about how I had bought some of these crackers I haven’t had in years. Less than 24 hours later, I began seeing ads for a product I’ve certainly never searched for or mentioned on Facebook.

So I did some digging into the settings in my phone. Android offers the ability to draw an overlay over the full screen. This is how the Facebook Messenger app uses “Chat Head” bubbles – which allow messenger to pop up over the top of other apps. When I dug in to permissions of the Facebook app, it asked for an overlay permission. I thought that was strange, since the messenger app with its “chat heads” is distinct from the Facebook app itself.

When I tried to disable this overlay, I was alerted that I had to disable permission to the Microphone before I could disable this overlay. Luckily, with Android 6.0 “Marshmallow” and above, users have more granular control over their individual permissions, rather than just granting an app whatever it wants. So I disabled the microphone permission, then disabled the overlay, and I’ve never again had an incident where I felt like Facebook is “listening” to me.

How Do I Stop This?

That conversation with my friends took place in 2016. So what can you do to see if maybe this applies to you? Well, first of all, you must have an Android 6.0 or higher device. I do not believe this privacy function can be tweaked in iOS, but I no longer have an iPad or an iPhone, so I’m not certain if you can stop this from happening. Leave a comment below if you’re an iPhone user who can offer feedback. But Android users can try the following (I currently use Android 7.1.1, so your steps may be slightly different):

  1. Go to your complete list of Apps, then open Settings.
  2. Scroll to Apps.
  3. Tap on Facebook in your list of apps.
  4. Scroll down until you see “Draw over other apps” and tap that.
  5. Disable option to “Draw over other Apps.”
  6. If prompted, you may have to go back out and adjust permissions to disable certain functions in order to disable the overlay feature.

If you really want to you can also go in to the Permissions section and disable certain features such as the Microphone itself, but remember if you use the Facebook app to record videos, or send voice messages, you may not want to disable that feature.

Let me know if that helps, I hope it does! If not, check back next week. Notice how the Goldfish Crackers advertisement above that was a screenshot from Facebook was actually an ad from Sam’s Club? Sam’s Club and Walmart are connected companies, and NEXT week, I plan to have an article discussing how Walmart Tracks you as a customer. See you next week!