I'd like a list of the top 100,000 domain names sorted by the number of distinct, public web pages.
The list could look something like this
Domain Name 100,000,000 pages
Domain Name 99,000,000 pages
Domain Name 98,000,000 pages
...
I don't want to know which domains are the most popular. I want to know which domains have the highest number of distinct, publicly accessible web pages.
I wasn't able to find such a list in Google. I assume Quantcast, Google or Alexa would know, but have they published such a list?
For a given domain, e.g. yahoo.com you can google-search site:yahoo.com; at the top of the results it says "About 141,000,000 results (0.41 seconds)". This includes subdomains like www.yahoo.com, and it.yahoo.com.
Note also that some websites generate pages on the fly, so they might, in fact, have infinite "pages". A given page will be calculated when asked for, and forgotten as soon as it is sent. Each can have a link to the next page. Since many websites compose their pages on the fly, there is no real difference (except that there are infinite pages, which you can't find out unless you ask for them all).
Keep in mind a few things:
Many websites generate pages dynamically, leaving a potentially infinite number of pages.
Pages are often behind security barriers.
Very few companies are interested in announcing how much information they maintain.
Indexes go out of date as they're created.
What I would be inclined to do for specific answers is mirror the sites of interest using wget and count the pages.
wget -m --wait=9 --limit-rate=10K http://domain.test
Keep it slow, so that the company doesn't recognize you as a Denial of Service attack.
Most search engines will allow you to search their index by site, as well, though the information on result pages might be confusing for more than a rough order of magnitude and there's no way to know how much they've indexed.
I don't see where they keep or have access to the database at a glance, but down the search engine path, you might also be interested in the Seeks and YaCy search engine projects.
The only organization I can think of that might (a) have the information easily available and (b) be friendly and transparent enough to want to share it would be the folks at The Internet Archive. Since they've been archiving the web with their Wayback Machine for a long time and are big on transparency, they might be a reasonable starting point.
Related
I want to scrape only four data items from the following page in each and every product from the following link that was an infinitive scroll down page.
name of the product
price of the product
href of the product
img src of the product.
All the data will be stored in a single csv file.
How can I do this?
Any idea?
i have not sure of this method.
get the original source code where you can get all of info of the website including the photo link or any word
This is usually considered a bad idea. If you write code to scrape a website for it's content, what happens when they change their markup? Or what happens when they realize you're scraping (stealing) their original content and ban your server's IP address or IP range even. It's a losing battle, so unless you have permission from them to do so I wouldn't recommend trying. It may work for a little while, but probably not for long. It's generally considered poor form to do something like this, so personally I wouldn't encourage anyone to teach someone how to scrape a website for it's content.
Furthermore, it says very clearly in their Terms of Use not to do exactly that:
You agree not to access (or attempt to access) the Website and the materials
or Services by any means other than through the interface that is provided by
Snapdeal. You shall not use any deep-link, robot, spider or other automatic
device, program, algorithm or methodology, or any similar or equivalent manual
process, to access, acquire, copy or monitor any portion of the Website or
Content (as defined below), or in any way reproduce or circumvent the
navigational structure or presentation of the Website, materials or any
Content, to obtain or attempt to obtain any materials, documents or
information through any means not specifically made available through the
Website.
My program currently goes through pages of a website gathering information. How do I set my loop to end when I have visited all the websites pages?
Is there some way of knowing the amount of webpages in any site?
Or do I have compare a block of pages I have visited eg 10 and if the pages are checked in that order again i know its repeating itself.
I'm sure there has to be a better way of knowing when to stop.
Keep track of pages visited ( may be keeping visited URL in a set) and when trying to scan a new page, check if it is already visited.
Breadth first search
Depth first search
Check these two algorithms. Think of the site as a graph
whose nodes are the pages and whose edges/arcs are the links
from one page to another. So two pages are neighboring
A → B, if there's a link from page A to page B.
Then just implement one of these two algorithms
(whichever you find more appropriate for your case).
Both of them have their respective stop conditions.
Your search in both cases should start with the root
page(s) which is usually default.ext or index.ext or
something similar (ext = html, asp, aspx, jsp, php, whatever).
You may want to pre-process the website with a SitemapGenerator and only visit the webpages included in the sitemap.
Is there some way of knowing the amount of webpages in any site
No. All you can do to examine a web-site is to make HTTP GET (or HEAD) requests and examine the response. That will tell you whether the URI is a valid identifier for a resource, and get you a representation of that resource. You can not know which requests will indicate a valid resource, nor can you practically generate all the possible URIs to perform an exhaustive search.
At best, all you can do is to start with a URI and find all the resources reachable from that URI, by examining resources that contain links to other resources, and then following those links.
Short question: What is the optimal method for routing multiple Domains for the same website? Specifically, how to route a uri with an international tld (.рф or .срб) and an ascii tld (.ru or .rs respectively)?
Long question: I have two domain names for the same website, one ascii and one international (cyrillic), http://domain.rs and http://домен.срб pointing to the same website. On the one hand, I know many websites which use both domains equally and parallelly (such as for example http://rts.rs and http://ртс.срб), but on the other, I've been advised that it's a bad practice from SEO point of view, and that instead I should have one domain redirecting to the other. Аre there any advices, or resources where I could get informed about how to handle international domains alongside with ascii ones?
Using "parallel" domains, without some kind of canonicalization in-place, will result in duplicated content issue. So, I wouldn't suggest it at all.
(There is a "loop-hole", sort of speak, that allows different TLDs to appear independently for different locals but truly this gains you nothing at all, just removes some of the DC issues...)
If I understand you correctly, the right thing to do here is to stick to one Main Domain and use 301 redirects for all others (page to page preferably). Ascii or not, is irrelevant. For Main Domain, choose you "oldest" one or/and the one with most inbound links.
In the long run this is also most practical solution as it will allow you to concentrate your link-building efforts, focusing all inbound links around one Winner instead of just spreading them around among several Mediocres.
I found a new search engine that speeds up finding piracy files from rapidshare, how could I automate a tool that finds our product using this engine and outputs the list of the rapidshare URLs that will be then sent to abuse#rapidshare.com.
search engine:
http://rapidlibrary.com/
(note, the captcha image appears just once there)
Below is a nice script that could perhaps do this pretty easily?
http://www.nasser.me/ubiquity/rapidsharecom-link-checker/
I thought about this in the past and being a "tv show pirate" myself it kinda annoys me why free torrent sites like The Pirate Bay and Mininova are being taken down while other not so free sites like Rapidshare, Megaupload and so on host the files and continue to make millions out of piracy.
The marketing model of those sites is viral, meaning the more a user spreads his link the more points he will receive and the less he will have to pay for his "subscription" in the future so is just obvious to suppose that those same links would be well spread over the Internet.
I would just search and scrap all the major warez forums out there, for a week or two and after that a search on the web should find all the remaining blogs / sites that still point to the pirated file.
I'm about to launch a multi-domain affiliate sites which have one thing in common which is content. Reading about the problem with duplicate content and Google I'm a little worried that the parent domain or sub sites could get banned from the search engine for duplicated content.
If I have 100 sites with similar look and feel and basically same content with some minor element changes, how will I go on preventing banning, indexing these correctly?
Should I should just prevent sub-sites from been indexed completely with robots?
If so how will people be able to find their site... I actually think the parent is the one that should only be indexed to avoid, but will love to her other expert thoughts.
Google have recently released an update that will allow you to include a link tag in the head of pages that are using duplicated content that point to the original version, they're called canonical links and they exist for the exact reason you mention, to be able to use duplicated content without penalisation
For more information look here..
http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html
This doesn't mean that your sites with duplicated content will be ranked well for the duplicated content but it does mean the original is "protected". For decent ranking in the duplicated sites you will need to provide unique content
If I have 100 sites with similar look
and feel and basically same content
with some minor element changes, how
will I go on preventing banning,
indexing these correctly?
Unfortunately for you, this is exactly what Google downgrades in its search listings, to make search results more relevant, and less rigged / gamed.
Fortunately for us (i.e. users of Google), their techniques generally work.
If you want 100s of sites, to be properly ranked, you'll need to make sure they each have unique content.
You won't get banned straight away. You will have to be reported by a person.
I would suggest launching with the duplicate content and then iterating over it in time, creating unique content that is dispersed across your network. This will ensure that not all sites are spammy copies of each other and will result in Google picking up the content as fresh.
I would say go ahead with it, but try to work in as much unique content as possible, especially where it matters most (page titles, headings, etc).
Even if the sites did get banned (more likely they would just have results omitted, but it is certainly possible they would be banned in your situation) you're now just at basicly the same spot you would have been if you decided to "noindex" all the sites.