Different between Google InURL and AllInURL
We can do some unique search using Google instead of just searching inside the content; we can also search in the URL (InURL/AllInURL), title (InTitle/AllInTitle), cache, etc. You probably won't find it in other search engine except Google for these several syntax.
Let me explain briefly what InURL and AllInURL syntax can do. These two syntaxes are actually having the same function, and the different only of these two syntaxes are InURL can be combined with other Google search syntax, while AllInURL cannot be combined with other Google search syntax.
In order to give a bit more explanation, let us see these two pictures below.
As you can see from the picture above, AllInURL syntax displays the search result in the URL only, while InURL syntax displays the search result not just in the URL, but also in other place like for this example in the content.