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Site Info - Epa.gov

Overview of web technologies used by Epa.gov.

Website Background

United States Environmental Protection Agency | US EPA

Description on Homepage

Number 5,925 of all websites according to Alexa

Popularity rank

CountryVisitorsCountry Rank
United States58.7%1,870
India8%7,687
Canada2.6%5,242
CityVisitorsCity Rank
New York, NY, US4.4%2,872
Los Angeles, CA, US4.4%3,766
San Francisco, CA, US3.8%2,226

Main visitors locations

Drupal is an open source content management system written in PHP, originally developed by Dries Buytaert.

Drupal 7
(5% of sites use a newer version)

PHP is a popular scripting language for creating web pages.

PHP

ColdFusion is a scripting language used for building web applications, and developed by Adobe Systems.

ColdFusion

Perl is a general-purpose, interpreted language, nowadays also used to create web pages.

Perl

JavaScript is a lightweight, object-oriented, cross-platform scripting language, mainly used within web pages.

JavaScript

jQuery is a JavaScript library that simplifies HTML document traversing, event handling, animating and Ajax interaction. Originally developed by John Resig.

jQuery

HTML - Hypertext Mark-up Language - is a language to define web pages.

HTML

UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII.

UTF-8

PNG (Portable Network Graphics) is a lossless compression image format, suitable to store graphics with uniformly colored areas, and originally introduced as a free, open-source successor of GIF.

PNG

JPEG (Joint Photographic Experts Group) is a lossy compression method suitable to store photographic images.

JPEG

External Cascading Style Sheets define style rules in a separate CSS file.

External CSS

Embedded Cascading Style Sheets define a set of style rules in a <style> element within a web page.

Embedded CSS

Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute.

Inline CSS

Gzip (GNU zip) is a file compression algorithm.

Gzip Compression

A strong ETag is an HTTP header field for validation of cached web pages, that indicates a byte-for-byte identical page in the cache.

Strong ETag

The Internet Protocol version 6 (IPv6) provides amongst others a vastly larger address space than the preceding version 4. We consider a website to support IPv6 if a 128-bit address is assigned to it, regardless of the content delivered at that address.

IPv6

HTTP Strict Transport Security (HSTS) defines a mechanism enabling web sites to declare themselves accessible only via secure connections.

HTTP Strict Transport Security

The websites redirects visitors to its www subdomain, e.g. from example.com to www.example.com.

Default subdomain www

The websites redirects visitors to use SSL encryption, e.g. from http://example.com/ to https://example.com/.

Default protocol https

A weak ETag is an HTTP header field for validation of cached web pages, that indicates a semantically equivalent page in the cache.

Weak ETag
(used until recently)

The Open Graph protocol, originally developed by Facebook, is an RDFa-based format that enables any web page to become a rich object in a social graph.

Open Graph

Generic RDFa (Resource Description Framework in attributes) is RDFa without further specialization.

Generic RDFa

DigiCert is an SSL certificate authority. This includes Verizon, whose Enterprise SSL Business has been acquired by DigiCert.

DigiCert

Facebook Social Plugins provide a way for Facebook users to share web pages with their friends.

Facebook

A Twitter Button allows a Twitter user to post a tweet from the visited site.

Twitter

The Pinterest Pin-It button allows website visitors to pin images onto Pinterest.

Pinterest

The Google +1 button allows visitors to recommend web pages to friends.

Google +1
(used until recently)

CrazyEgg is a website visitor and click tracking service.

CrazyEgg

The Google Tag Manager is a Google service to support webmasters to manage tags on their websites.

Google Tag Manager

The Apache HTTP Server is a popular open source web server by the Apache Software Foundation.

Apache

Akamai is a content delivery network.

Akamai
hosting info based on data from ipinfo.io

United States Government

.gov

United States
Netherlands
Hong Kong
(used until recently)

English

Technology Score

The technology score rates a site based on its technologies in a range from 0 to 100. It consists in a popularity score (how many sites use the same technologies), a traffic score (how much traffic have other sites using the same technologies) and a version score (how many sites use more recent technology versions). Quality alerts also affect the rating.

TotalPopularity TrafficVersion
Technology Score61605995
Content Management Systems57225495
Server-side Programming Languages779163
Client-side Programming Languages7510051
JavaScript Libraries729847
Markup Languages708852
SSL Certificate Authorities471580
Social Widgets627153
Traffic Analysis Tools381066
Web Servers547038
Reverse Proxy Services573381

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