OpenID Observatory is part of a research study supported by the Telematic Engineering Department (DIT) at the Universidad Politécnica de Madrid (UPM), meant to make a survey of OpenID's implementation status. Here you can find statistics covering from the most used OpenID's providers to the web standards that can be used along with your OpenID. You can partipate in our study by entering your OpenID above.

OpenIDs already checked: 1144

OpenID Identifiers Protocol

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OpenID identifiers currently support HTTP, HTTPS and XRI. The great majority of identifiers use HTTP, while HTTPS is infrequent. We don't support XRI at the OpenID Observatory, since very few people use it, there is not support for it in current browsers and there is no standard way to attach a profile web page to it.

OpenID Identifiers Domains

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This graph analyzes most used domains in OpenID identifiers. There is a strong tendency to use own customized domains, usually personal blogs and homepages. Currently there is a 50% of unique domains. Blogger and myOpenID are the most popular domains. Other blogging platforms follow, including Wordpress and LiveJournal.

OpenID Providers (%)

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The list of OpenID providers is smaller, currently 22% of the analyzed identifiers. Many people choose to relay in an external OpenID provider, instead of hosting their own. myOpenID is the most popular OpenID provider, followed by Blogger. Other providers include LiveJournal, Verisign and ClaimID.

Web Standards (%)

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Among the Web standards found in the HTML of OpenID identifiers, Microformats is the most popular one. The second format most used is RSS. Other popular standard is RSD. Atom Syndication format is less used but still frequent. Finally, FOAF is the least common of the Web standads analyzed.

HTML HEAD Links (%)

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The list of OpenID providers is smaller, currently 22% of the analyzed identifiers. Many people choose to relay in an external OpenID provider, instead of hosting their own. myOpenID is the most popular OpenID provider, followed by Blogger. Other providers include LiveJournal, Verisign and ClaimID.

Microformats (%)

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This graph shows the most frequent Microformats found in the HTML of OpenID identifiers. RelTag is the most popular. hCard follows, something foreseeable as it is the Microformat for personal data. XFN and Adr are also common, related with contacts and address respectively.

hCard vs FOAF (%)

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OpenID identifier resources usually also provide information about the personnas behind them. There are a couple of formats suitable for this. hCard is the Microformat adaptation of vCard. It is the most popular. On the other hand, FOAF is the Semantic Web vocabulary for personal data.

Deployed OpenID Protocol Versions

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OpenID protocol currently defines three versions. Version 1.1 was published on May 2006. Version 2.0 a year and half later. Most of OpenID identifiers do not support the lastest version of the protocol. Among the identifiers supporting it, most of them maintain compatibility with former versions.

OpenID Discovery Technologies (%)

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OpenID specifications define two ways for discovering the OpenID service upon the identifier and starting protocol requests. Through the specifications prioritize Yadis as the first option to be tried, it is only supported by half of the identifiers. On the other hand, HTML discovery is supported by almost all the identifiers.

OpenID Protocol Versions in HTML discovery

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Former versions of the OpenID protocol are far more popular in HTML discovery.

OpenID Protocol Versions in Yadis discovery

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Support for OpenID 2.0 is much more frequent in Yadis discovery. More than 75% of the identifiers supports it besides former protocol versions.

XRDS service types (%)

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This graph shows the most common service types announced in XRDS files. OpenID protocol uses Yadis as a way to discover OpenID services. The information is described in XRDS, a XML format for discovering services associated with a resource.
OpenID authentication (1.0, 1.1, 2.0) and OpenID Simple Registration Extension (1.0, 1.1) are the main services announced by OpenID identifiers supporting XRDS. Other popular services include OpenID PAPE Phishing Resistant Authentication and OpenID Attribute Exchange. The rest of services are less common, but are all related to OpenID.