allinurl and site commands

What's the difference between the two?

[Nikke]

I have been checking the number of indexed pages from sites with the allinurl:www.domain.tld command, seeing it fluctuate, some days with 10-20 new pages, some days going back 5-20 pages.

I try to add at least one page per day to most sites, and it will regularly get picked up in the index.

But when I saw that the site:www.domain.com command became available without a keyword, it struck me that I actually have one keyword that exists on every single page on the site I'm checking the most.

Now, the allinurl command and the site command returns very different figures.

allinurl - 1,240 pages
site - 1,780 pages
site + keyword - 1,780 pages

Exactly what is the difference? In my ignorance, I thought that the allinurl would return all urls.

[BReflection]

my site: returns 208 and my allinurl: returns 212

[BigDave]

I could create a site that contains your domain name in one of my URLs.

www.mysite.com/www.yoursite.com/

[Nikke]

my site: returns 208 and my allinurl: returns 212

I've seen this on some sites I monitor, but in those cases the results will include other sites framing or linking via a url like

www.site.tld/go2site=www.mysite.tld

Thus creating a result with the sought site address in an url, even though it is not on-site

<added>Just as BigDave also described.
However, my results indicate the exact opposite. More on-site urls than are found with the allinurl command...</added>

[Sharper]

I've found "allinurl:" to be wildly innacurate as you get to higher and higher totals, especially in the last few months. I'd ignore it and just use "site:" as suggested by GoogleGuy.

[online]

i've also noticed that if i use site:domain.com, i get nearly all pages without description, cache link or any other information.. if i do allinurl:domain.com for the same site, i get these pages as normal result, with all information there usually is on serps.. what does that mean? any ideas?