Is there a way to find out when a page was first indexed?

[avalon37]

We have duplicate pages being generated on our site and blocked all links to prevent it from happening in the future. My question is, is there a way to see when a page was first indexed in Google? We are still getting a ton of traffic from these duplicate pages and I want to ensure that these pages are old and not new ones (say in the last 6 months). Is there a way to lookup the actual index date (or a close range) to when individual pages were "found" by Google?

[netmeg]

Not that I know of. All you can do is maybe guess by way of analytics or log files, if you still have them.

[Sally Stitts]

I like to use the "wayback machine". Just Google it.
It is great for looking waaaaay back (years).
Just type in the URL.
It will show you when the site first went online, and many months of data changes after that.

However, there is an indexing delay.
I think it is 6 months, so for pages more recent than that, it won't show you anything.
.

[aakk9999]

Wayback will show if ia_archiver user agent has crawled the page, but not whether Googlebot has seen it.

The lack of the page in wayback machine does not mean that it did not exist previously, although existence of the page there will mean it is not a new URL.

[bumpski]

Use the site: command on your site.
Then click on "search tools" "anytime" "custom range". Enter, say, 1/1/1995 for the "From" date. You can leave the "To" date empty, Google assumes today.
Google will now show more dates for pages. The date may be a freshness date but it also may be the apparent date Google first picked up the page.
If you have a small site click "search tools" again and you will see a count of pages. (Larger sites must work in smaller sub-domains or sub-directories for these counts to be useful.) This count will typically be lower than the count or number of results Google indicates for the "site:" directive alone.
For some reason, you will find that Google has not assigned a date to all of your pages, AND, the pages that do not show up in this date range search will never show up in any date range search. Also the missing pages may not have a reading level, which is another subject altogether.

See this thread for more details:
[webmasterworld.com...]
I was intrigued that there were no comments about this thread. Many webmasters that post here regularly have websites with numerous pages that do not have "dates" or "reading levels" assigned. (I think this might be a subtle problem)

If you do have multiply indexed pages, I believe Google will only show a date for the page it considers the original. I believe this is true for reading levels as well. I'm trusting my memory on these last two observations.
Finally see the thread regarding indexing https pages:
[webmasterworld.com...]