Forward-confirmed reverse DNS (FCrDNS) Tool


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This tool is available at

The tool allows you to do Forward and Reverse DNS lookups. Given a host name, the tool finds its IP. Conversely, given an IP the tool finds the corresponding host.

Forward DNS lookup resolves a host name to an IP address (A record). The process of reverse resolving an IP address uses the pointer DNS record type (PTR record).

Thus, the tool does Forward-confirmed reverse DNS (FCrDNS) lookups. This is a networking parameter configuration where a given IP address has both forward (name-to-address) and reverse (address-to-name) Domain Name System (DNS) entries that match each other.

Unlike similar tools which do Forward/Reverse DNS lookups on a single host, our tool does lookups on multiple hosts, saving users time and effort.

To use the tool, enter one host name (or IP) per line, ending each line by pressing the Enter key.

Forward DNS lookups are faster than Reverse DNS lookups so for the latter you may want to do a few checks at once.

Depending on DNS server configurations, lookups with or without the www alias can produce dissimilar results. For instance with and without www returns different results.


Our tool can be used to identify Internet service providers (ISPs) who do not provide properly matching DNS and rDNS records. It can also be used to find shared hosting and, when misconfigured, forwarders information leaks.

FCrDNS verification can also be used for whitelisting purposes because spammers and phishers cannot usually by-pass this verification when they use zombie computers for email spoofing. That is, the reverse DNS might verify, but it will usually be part of another domain than the claimed domain name.

Z-to-P and P-to-Z Transformations


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We have developed a new tool that simplifies Z-to-P and P-to-Z Transformations. It is available at

Unlike similar tools that handle one input score at a time, our tool computes Z-to-P and P-to-Z transformations over an entire set of input scores, saving users time and effort.

The tool facilitates the work of data miners, statisticians, or anyone that need to compute Z and P scores without having to consult Z statistical tables.

It is a great tool for students and teachers interested in Statistics.

What Drives Organic Traffic to Retail Sites?


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If you really want to understand the effectiveness of SEO from a scientific standpoint, read Search Engine Optimization: What Drives Organic Traffic to Retail Sites? from Journal of Economics & Management Strategy, Volume 25, Number 1, Spring 2016, 6–31

I know. The piece is a bit old by Internet standards, but the more one reads it the more one learn. Baye, De Los Santos, & Wildenbeest have done a great research publishing their findings. The study was sponsored by Google, a few years ago.

Actually, the piece was written in 2013, presented at a conference in 2014, and its finding republished in 2016.

It is still very relevant to search marketers and prospective clients.

My favorite piece from their findings is this:

“While previous literature has focused on the role of sponsored links in consumer searches, Michael R. Baye, Babur De los Santos, and Matthijs R. Wildenbeest are the first to explain the drivers of organic (natural) clicks to improve search engine optimization (SEO). In this interview, the authors discuss why investing heavily in brand equity, instead of exclusively on search rankings, is crucial for a retailer’s SEO strategy. ”

and this:

“We also point out that investments that improve site quality and consumer awareness (and more broadly, that enhance an online retailer’s brand equity) are likely to have spillover benefits in  other channels that are not accounted for in this or other studies of organic and sponsored search. These benefits include increases in clicks through other online channels (such as price comparison sites), increases in the number of direct visits to a retailer’s website, increases in visits through navigational searches at search engines, and increases in traffic at the retailer’s physical stores. These considerations–coupled with the fact that position is a zero-sum game and thus a retailer is unlikely to obtain a sustainable advantage through direct efforts to improve its ranking–lead us to conclude that brand equity is one of the more important components of retailers’ SEO strategies.”

pH Scale Calculator


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A new chemistry tool is available now at

This one allows you to generate a customized scale of pH, pOH, and concentration values.

Supporting material includes a sortable table of pH of common supplies and biological materials.

Enjoy it.

Crowdsourcing & Freelancing Miner


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For crowdsourcers and freelancers:

This is a new miner, available at

Find work-for-hire jobs and remote employment opportunities. Search by crowdsourcing and freelancing companies, projects, or expertise area.Be hired!

A Step Closer to Mind Retrieval


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We are getting closer to Mind Retrieval. The implications of being able to mine the brain are obvious for all sciences, in addition to homeland security, law and order, marketing research, etc.

I got last night this news, “Scientists map brain’s ‘thesaurus’ to help decode inner thoughts

Scientists at the University of California, Berkeley, have taken a step in that direction by building a “semantic atlas” that shows in vivid colors and multiple dimensions how the human brain organizes language. The atlas identifies brain areas that respond to words that have similar meanings

Read the news here:

Last year I mentioned that we are getting close to Mind Retrieval.

That post was a reminder of a previous 2010 interview by Nuno Valenzuela, a visionary SEM from Spain. Great guy.

I met Nuno back in 2007 when I was invited to present at a Madrid Search Engine Congress (OJOBuscador) on Latent Semantic Indexing (LSI).

See conference legacy links here

Here is a link to Nuno’s interview. You may want to resize browser window:

And some relevant links here:

Unfortunately, OJOBuscador site is now defunct so their links are broken.


Improving Citations with Short Titles


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We updated our Keywords Spam Detector,,

and added new content that editors, writers, SEOs, and others might find useful. I’m reproducing below some of the new material added.

Recommendations for Writing Titles

  • Search Engines
    Search engines might process entire titles, but tend to display in their search results about less than 70 characters. So you may want to limit web page titles to about this mark, like between 60 to 65 characters.
  • Academic Journals
    Some editorial guidelines, like JAMA, limit the length of titles to 150 characters for reports of research and other major articles and 100 characters for Editorials, Viewpoints, Commentaries, and Letters. (JAMA, 2016).
  • Words Usage in Titles
    The average character length of a word in English, Spanish, and similar languages is about six. Thus on average a 60-character title amounts to about 10 words, regardless of if these are unique terms. This is just a reference mark as text estimates can be influenced by other variables. For instance, text averages can be topic-sensitive and influenced by their syntactic structure (Busch-Lauer, 2000).

How short is too short?

  • The length of a title is a relative concept. By current standards, a 60-character title, which amounts to about 10 words, is considered fair enough for search engines, very short for most academic journals, but too long for songs. Indeed. A recent study found that song titles with one or a few words are on the rise and preferred (Kopf, 2016). However, these types of titles are not informative enough for search engines and academic journals.
  • Generally speaking, articles with short titles are more attractive to readers than those with longer titles because the latter are frequently perceived as complex, confusing, or boring. If readers don’t find attractive a title or cannot understand it, there is a little chance that they will read or cite its abstract or the full paper (Deng, 2015; Chawla, 2015).
  • A 2015 study confirmed that academic papers with short titles receive more citations per paper, being more attractive to readers than articles with longer titles (Letchford, A., Moat, H. S., and Preis, T., 2015).
  • A 2012 study found that short-titled articles have higher viewing and citation rates than those with longer titles. Similarly, articles with results-describing titles are cited more often than those with methods-describing titles (Paiva, Nogueira Lima, & Ribeiro Paiva, 2012). The same study found that titles containing a question mark, containing a reference to a specific geographical region, and that used a colon or a hyphen were associated with a lower number of citations.

Visit the Keywords Spam Detector page to learn more about the topic or to follow the referenced studies. It might at least help you to investigate why artists like Rihanna and Justin Bieber prefer one-word song titles.