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All bikes1all have unique serial numbers.
Finding a bicycle serial number
Most bicycles have their serial number engraved beneath their bottom bracket, but sometimes serial numbers are found in other places. Here are some examples of where and what to look for:
The bottom bracket (where serial numbers are typically located) is circled.
A serial number on the underside of a bottom bracket.
Another serial number beneath the bottom bracket, aligned parallel to the frame.
Some Schwinn bicycles have the unique identifying number (their serial number) on the head tube. This is on the front of the bike.
A serial number located on a rear dropout. Some BMX bikes and a few Schwinn bicycles place the serial on the rear dropout. On older Schwinns there are numbers stamped on both the drive side and non-drive side rear dropouts; the one on the non-drive side dropout is the serial number.
Some bikes have multiple serial numbers.2When adding a bike to the Index, it's best to enter all the groups of numbers and letters separated by spaces.
Hopefully you can find the serial number on the bicycle you're looking at -email [email protected] you're having trouble.
Searching serials on Bike Index
Finding bicycles by serial number on Bike Index is a critical part of our functionality. When searching for a serial number, use our serial search bar - it's the second bar on our search form.
We've done a few things to make it more likely that you'll find the bike you're looking for.
- Certain numbers and letters are difficult or impossible to distinguish between (e.g. 0 and O, S and 5). We treat all these numbers the same way - a search for
005LLL
will match a bike with the serialOOS111
. - We split bike serials up by spaces and store each separately. If you see multiple numbers on a bicycle - such as in the photo of the Look bike above - try searching for just one of the numbers at a time. Searching for either
M4106I9CA1
or200910427-2A
will find the bike. - We do close serial matching - bikes with serial numbers that are close to the serial you entered are shown below the matching results under the heading 'Serial Numbers Close to ...' - given a search of a serial number with a couple numbers/letters that are different or missing.
- We do not currently do partial serial searches. If you search for
1234
, you will only find bikes with serial numbers of1234
and serials close to that - not a bike with serial number of12345689
.
- Okay, fine, somaybethere are a few bikes without serial numbers, but this is rare and typical only on hand made bikes or really old bicycles.↩
- In this picture200910427-2Ais a manufacturer number and not a serial number. However, to make bikes as easy as possible to find, we'd love it if you entered all numbers you encounter.↩
You probably have a general idea of which iPhone you have—iPhone 6, SE, 4s, X, and so on. But behind the marketing names, each iPhone configuration has its own model number. You normally won’t need to know this number, but it could come in handy if you ever need to get more technical details about your device. Here’s where you can find your iPhone’s model number—and what that number means.
Which number is which?
Apple uses two numbering schemes for its devices. The first, which we’ll call the “A” number (hat tip to The iPhone Wiki for the name) is a five-digit alphanumeric string that starts with the letter A followed by four numbers.
The second model number is a five-digit alphanumeric string that usually starts with the letter M, though the first letter can vary depending on the device. You’ll sometimes—but not always—see “LL/A” or something similar appended to the end of this number. We’ll refer to this second number as the “SKU” in this article for clarity’s sake.
(Confusingly, Apple can’t even decide for itself what each number is called in its documentation or on its devices. For instance, Apple refers to both the “A” number and the SKU as the “model” number, depending on where you look.)
What’s the difference? Basically, the “A” number is used to generally describe a model family (or revision thereof), such as the iPad Air 2 with LTE or the 13-inch MacBook Air. Meanwhile, the SKU is used to describe a specific configuration of that model (for example, the 13-inch MacBook Air with 256GB of storage). Put another way, the “A” number is a more general identifier, while the SKU is more specific.
Finding your phone’s model identifiers: Older iPhones
Now that we’ve got that out of the way, let’s get to checking those numbers.
Finding the “A” number: You’ll find your phone’s “A” number stamped on the back of the device. Flip it over, look for the fine print below the “iPhone” label, and look closely for the “Model” identifier. My iPhone 5c, for example, carries an “A” number of “A1532.”
Finding the SKU: To find your phone’s SKU, go to your phone’s Settings app, tap General, then tap About. Scroll down to Model, and make a note of the alphanumeric string here. In my phone’s case, its SKU is NF130LL/A—the N denoting that it’s a replacement unit.
Finding your model identifier and “A” number on newer iPhones
Starting with the iPhone 8, Apple stopped stamping the “A” number on the back. But that information is still on the phone—it’s inside the operating system.
Here’s how to find both the “A” number and the model identifier. On your iPhone 8 or later, tap the Settings app. Tap on General, then tap About. Scroll down to Model; this is the model identifier number/SKU.
To see the “A” number, tap on the Model number. It will change to a numeric ID starting with A.
Finding out more
Now that you know your model numbers, you can punch that info into a Google or Bing search and see what comes up.
Another great resource is The iPhone Wiki’s device models page. This page lists model “A” numbers for every iOS device, as well as each configuration’s SKU/model number. It’ll also give you a little information on Apple’s SKU numbering scheme that you might find useful.
Does your model number look like the image below? The first 10-characters (i.e., model and type) stamped on your engine will look like this:
Please Note: If the model & type numbers on your Briggs & Stratton engine are only 9 characters, please enter a 0 (zero) at the beginning of the model number.
Does the number you have look like this? If not, locate the correct number by following instructions in Step 2.
Step 2: Locate the Model Number
As shown in the Where to Find Your Engine Model Number video below, the engine model number is generally a number stamped into metal directly on your engine.
Some engines come with a cover or 'shroud'. It should be noted that these covers come in a variety of colors, sizes and shapes. Regardless of your cover, the engine model number will be in one of 5 locations:
Above the Starter
Apple Model Number Lookup
Metal tag directly above the rewind starter
Tools you may need:
Flashlight
Label on the Fuel Tank
Label on the side of the fuel tank
Tools you may need:
Flashlight
On the Metal Cover
Stamped directly into the metal near the spark plug
Tools you may need:
Flashlight
On the Valve Cover
Stamped on the left side of the overhead valve (OHV) cover
Tools you may need:
Flashlight
On the Valve Cover
Stamped on the left side of the overhead valve (OHV) cover
Tools you may need:
Flashlight