Site report for http://www.espn.com

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A host's Sender Policy Framework (SPF) describes who can send mail on its behalf. This is done by publishing an SPF record containing a series of rules. Each rule consists of a qualifier followed by a specification of which domains to apply this qualifier to. For more information please see open-spf.org.

Warning: It appears that this host does not have an SPF record. There may be an SPF record on espn.com: Check the site report.

Setting up an SPF record helps prevent the delivery of forged emails from your domain. Please note that an SPF record will only protect the domain it is added to and not any mail-enabled subdomains. It is recommended to add an SPF record to any subdomain with an MX record.

DMARC (Domain-based Message Authentication, Reporting and Conformance) is a mechanism for domain owners to indicate how mail purporting to originate from their domain should be authenticated. It builds on SPF and DKIM, providing a method to set policy and to give reporting of failures. For more information please see dmarc.org.

This host does not have a DMARC record. There may be a DMARC record on the site report for espn.com: Check the site report.

Web Trackers are third-party resources loaded onto a webpage. Trackable resources include social sharing widgets, javascript files, and images. These trackers can be used to monitor individual user behaviour across the web. Data derived from these trackers are primarily used for advertising or analytics purposes.

• Cloud & PaaS

  Cloud computing is the use of computing resources (hardware and software) that are delivered as a service over a network (typically the Internet). Platform as a service (PaaS) is a category of cloud computing services that provide a computing platform and a solution stack as a service.

  Technology	Description	Popular sites using this technology
  Amazon Web Services - CloudFront	Amazon Content Delivery Network	www.capitalone.com, player.twitch.tv, 9gag.com

• HTTP Accelerator

  A web accelerator is a proxy server that reduces web site access times.

  Technology	Description	Popular sites using this technology
  Varnish	An HTTP accelerator for web applications	www.20minutes.fr, www.ouest-france.fr, www.repubblica.it

• Application Servers

  An application server is a server that provides software applications with services such as security, data services, transaction support, load balancing, and management of large distributed systems.

  Technology	Description	Popular sites using this technology
  CentOS	No description	www.linkomanija.net, www.s3blog.org, fantasy.espn.com
  Apache	Web server software	www.majorgeeks.com, www.npr.org, www.hirkereso.hu

• Server-Side

  Includes all the main technologies that Netcraft detects as running on the server such as PHP.

  Technology	Description	Popular sites using this technology
  SSL	A cryptographic protocol providing communication security over the Internet	github.com, login.microsoftonline.com, accounts.google.com
  PHP Enabled	Server supports PHP	www.trendupdeal.com, www.ilovepdf.com, www.xe.com

• Client-Side

  Includes all the main technologies that run on the browser (such as JavaScript and Adobe Flash).

  Technology	Description	Popular sites using this technology
  Asynchronous Javascript	No description	www.ebay.com, www.booking.com, www.bbc.co.uk
  Local Storage	No description	www.amazon.in, www.w3schools.com, www.amazon.fr
  JavaScript	Widely-supported programming language commonly used to power client-side dynamic content on websites	t.co

• Client-Side Scripting Frameworks

  Frameworks or libraries allow for easier development of applications by providing an Application Program Interface (API) or a methodology to follow whilst developing.

  Technology	Description	Popular sites using this technology
  Bootstrap Javascript Library	No description	www.fidelity.com, www.ncaudienceexchange.com, www.ansa.it

• Content Delivery Network

  A content delivery network or content distribution network (CDN) is a large distributed system of servers deployed in multiple data centers in the Internet. The goal of a CDN is to serve content to end-users with high availability and high performance.

  Technology	Description	Popular sites using this technology
  Cloudfront	No description	www.amazon.ca, www.imdb.com, www.wappalyzer.com

• Tools

  Any software or site builder that aids web development.

  Technology	Description	Popular sites using this technology
  OpenSSL	No description	www.imagebam.com, www.abc.net.au, www.leonard-de-vinci.net
  Optimizely	No description	www.cdw.com, www.xbox.com, www.lastpass.com

• Character Encoding

  A character encoding system consists of a code that pairs each character from a given repertoire with something else such as a bit pattern, sequence of natural numbers, octets, or electrical pulses in order to facilitate the transmission of data (generally numbers or text) through telecommunication networks or for data storage.

  Technology	Description	Popular sites using this technology
  UTF8	UCS Transformation Format 8 bit

• HTTP Compression

  HTTP compression is a capability that can be built into web servers and web clients to make better use of available bandwidth, and provide greater transmission speeds between both.

  Technology	Description	Popular sites using this technology
  Gzip Content Encoding	Gzip HTTP Compression protocol	www.seznam.cz, www.ups.com, www.tsetmc.com

• Web Browser Targeting

  Web browser targeting enables software applications to make use of specific functions of the browser as well as optimizing the application for specific browser versions.

  Technology	Description	Popular sites using this technology
  Content Security Policy	Detect and mitigate attacks in the browser	www.mozilla.org, www.linkedin.com, teams.microsoft.com

• Doctype

  A Document Type Declaration, or DOCTYPE, is an instruction that associates a particular SGML or XML document (for example, a webpage) with a Document Type Definition (DTD).

  Technology	Description	Popular sites using this technology
  HTML5	Latest revision of the HTML standard, the main markup language on the web	www.google.com, www.googleadservices.com, login.live.com
  HTML	The main markup language used for displaying web pages within browsers	www.uol.com.br, www.elmundo.es, console.aws.amazon.com

• HTML 5

  HTML5 is a markup language for structuring and presenting content for the World Wide Web and a core technology of the Internet. It is the fifth revision of the HTML standard.

  Technology	Description	Popular sites using this technology
  Viewport meta tag	HTML5 tag usually used for mobile optimization	medium.com, disqus.com, vars.hotjar.com

• CSS Usage

  Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation semantics (the look and formatting) of a document written in a markup language (such as XHTML).

  Technology	Description	Popular sites using this technology
  External	Styles defined within an external CSS file	www.paypal.com, www.amazon.co.uk, www.microsoft.com