Het bestelnummer staat onder de track-en-tracecode.

Dutch nouns have grammatical gender, and that determines which definite article they take.

• het bestelnummer uses het
• de track-en-tracecode uses de

There is not always a simple rule you can see from the meaning alone, so you often have to learn the article with the noun.

A useful extra point: in Dutch compounds, the last part usually determines the gender/article.

• bestelnummer ends in nummer, and het nummer is correct, so the whole compound is het bestelnummer
• track-en-tracecode ends in code, and de code is correct, so the whole compound is de track-en-tracecode

It is a compound noun:

• bestel = order / ordering
• nummer = number

So bestelnummer literally means order number.

Dutch very often combines words into one longer noun, where English would often use two separate words.

In Dutch, staan is often used for the location of something when it is thought of as standing, written, or appearing somewhere.

So in a sentence like this, staat means something like:

• is located
• appears
• is shown

That is why Het bestelnummer staat onder de track-en-tracecode sounds natural in Dutch.

Compare:

• Het adres staat op de website. = The address is on the website.
• Zijn naam staat op de lijst. = His name is on the list.

English usually just uses is, but Dutch often prefers staat in these contexts.

Dutch main clauses usually follow the V2 rule, meaning the finite verb comes in the second position.

Here the sentence begins with the subject:

• Het bestelnummer = position 1
• staat = position 2
• onder de track-en-tracecode = the rest

So the structure is:

Subject + finite verb + other information

This is one of the most basic Dutch sentence patterns.

Yes, absolutely.

That version is also correct. It just puts more focus on the location first:

• Onder de track-en-tracecode staat het bestelnummer.

Because of the Dutch V2 rule, the finite verb still has to stay in second position, so when onder de track-en-tracecode comes first, staat still comes next, and the subject moves after it.

onder means under or below.

So:

• onder de track-en-tracecode = under the tracking code

In this sentence, it describes where the order number appears on a page, label, or screen.

No. In modern Dutch, the noun does not change form after a preposition like onder.

So you simply say:

• onder de track-en-tracecode
• onder het nummer
• onder mijn naam

There is no case ending to add here in normal modern Dutch.

Dutch often forms long compound nouns as one unit, and hyphens are commonly used when a compound contains foreign words, English elements, or awkward combinations.

Here:

• track-en-trace is a borrowed expression
• code is added to it
• hyphens make it easier to read: track-en-tracecode

You may also see related forms in real life such as track & trace-code or other spelling variations in informal or commercial writing, but track-en-tracecode is a very understandable Dutch-style form.

Yes. Dutch often borrows English business, tech, and shipping terms.

track en trace is very common in Dutch for parcel tracking. When it is built into a larger noun, it behaves like a Dutch compound:

• de track-en-tracecode
• een track-en-tracecode

So even though the origin is English, the whole expression functions as Dutch vocabulary.

Because Dutch usually writes compound nouns as one word.

So:

• bestelnummer is correct
• bestel nummer is not standard

This is a major difference from English, where order number is normally written as two words.

A good rule for learners: if English uses noun + noun, Dutch very often turns that into a single compound word.

It is singular.

You can tell from:

• the article de
• the singular meaning the tracking code

The plural would usually be:

• de track-en-tracecodes

Likewise:

• het bestelnummer = singular
• de bestelnummers = plural

A learner-friendly approximation is:

• bestelnummer → buh-STEL-num-mer

A few helpful points:

• be- is usually unstressed
• the stress falls on stel
• nummer sounds roughly like NUM-mer
• the Dutch u in nummer is not exactly the same as English u, but an approximate English-style uh is a good start

If you say it clearly as be-stel-num-mer, Dutch speakers will understand you well.

Yes.

staan onder can be used both for:

1. physical location

   • De doos staat onder de tafel. = The box is under the table.

2. position in text/layout

   • Het bestelnummer staat onder de track-en-tracecode. = The order number appears below the tracking code.

So the same structure works in both concrete and visual/layout contexts.