Bringing Big Data to SEO Professionals - Ahrefs

Ahrefs by the numbers

The Ahrefs team takes great pride in collecting, processing and storing large amounts of data for search marketing professionals.

We crawl the entire web 24/7 (much like search engines do) storing petabytes of information about live websites — how they link to each other and what keywords they rank for in search results.

We process large amounts of clickstream data to maintain the world's largest third-party database of search queries, with estimated monthly search volume and advanced keyword research metrics.

We're proud of our backend infrastructure. All existing solutions couldn't keep up with the volume of data that we operate, so we had to custom build the larger part of our software infrastructure in-house.

2906 Servers

  • 332K CPU cores
  • 2.4PB RAM
  • 51PB HDD
  • 210PB SSD

Content index

Our content index is basically a mini search engine. You can search for any word and we'll return all the pages mentioning that word with our useful SEO metrics attached to them.

  • Every 24 hours we discover
    30 million new pages
  • Every 24 hours we update metrics for
    420 million pages
  • Total content index size
    10 billion pages

Search traffic index

Search Traffic index is a database of search queries that we use to approximate the search traffic that any website or URL has, and show you the actual keywords that it ranks for.

500 million keywords. 189 countries

  • 148 M United States
  • 30 M India
  • 28 M Japan
  • 22 M United Kingdom
  • 19 M Germany
  • 15 M France
  • 14 M Indonesia
  • 13 M Canada
  • 13 M Australia
  • 12 M Turkey
  • 12 M Italy
  • 12 M Brazil
  • 10 M Spain
  • 10 M Mexico
  • 9.2 M Poland
  • 9.1 M Russian Federation
  • 6.8 M Vietnam
  • 6.7 M Thailand
  • 6.6 M Netherlands
  • 5.5 M Philippines
  • 5.2 M Ukraine
  • 4.9 M Argentina
  • 4.2 M Colombia
  • 3.7 M Sweden
  • 3.4 M Taiwan
  • 3.1 M Malaysia
  • 2.7 M South Africa
  • 2.7 M Chile
  • 2.7 M Saudi Arabia
  • 2.5 M Egypt
  • 2.4 M Belgium
  • 2.4 M Peru
  • 2.3 M Pakistan
  • 2.1 M Denmark
  • 2.1 M Austria
  • 2 M Greece
  • 2 M Romania
  • 1.9 M Czechia
  • 1.8 M Israel
  • 1.8 M Switzerland
  • 1.8 M Korea
  • 1.8 M Singapore
  • 1.7 M Hungary
  • 1.6 M Hong Kong
  • 1.6 M Finland
  • 1.5 M Norway
  • 1.5 M Portugal
  • 1.4 M Nigeria
  • 1.4 M United Arab Emirates
  • 1.3 M Ireland
  • 1.3 M New Zealand
  • 1.2 M Bangladesh
  • 1.1 M Ecuador
  • 1.1 M Venezuela
  • 1 M Algeria
  • 933 K Kazakhstan
  • 927 K Morocco
  • 899 K Slovakia
  • 889 K Bulgaria
  • 809 K Serbia
  • 675 K Croatia
  • 667 K Belarus
  • 625 K Kenya
  • 603 K Sri Lanka
  • 593 K Iraq
  • 551 K Bolivia
  • 524 K Guatemala
  • 489 K Dominican Republic
  • 463 K Lithuania
  • 436 K Nepal
  • 434 K Costa Rica
  • 393 K Uruguay
  • 389 K Jordan
  • 389 K Tunisia
  • 373 K Ghana
  • 330 K Azerbaijan
  • 316 K Panama
  • 306 K Slovenia
  • 301 K Kuwait
  • 300 K Paraguay
  • 287 K Uzbekistan
  • 281 K Puerto Rico
  • 251 K El Salvador
  • 248 K Honduras
  • 246 K Bosnia & Herzegovina
  • 229 K Lebanon
  • 228 K Qatar
  • 221 K Estonia
  • 220 K Latvia
  • 206 K Oman
  • 197 K Georgia
  • 190 K Tanzania
  • 175 K Moldova
  • 170 K Uganda
  • 167 K Kyrgyzstan
  • 157 K China
  • 157 K Cyprus
  • 151 K Nicaragua
  • 148 K Myanmar
  • 148 K Jamaica
  • 146 K Côte d'Ivoire
  • 134 K Armenia
  • 129 K Zambia
  • 129 K Libya
  • 127 K Cambodia
  • 127 K Bahrain
  • 126 K Cameroon
  • 122 K Senegal
  • 120 K Palestinian Territory
  • 120 K Ethiopia
  • 117 K Trinidad And Tobago
  • 114 K North Macedonia
  • 110 K Congo, Democratic Republic
  • 109 K Albania
  • 99 K Luxembourg
  • 90 K Zimbabwe
  • 90 K Mauritius
  • 86 K Angola
  • 85 K Malta
  • 75 K Mozambique
  • 69 K Mongolia
  • 63 K Montenegro
  • 61 K Laos
  • 58 K Turkmenistan
  • 57 K Haiti
  • 57 K Iceland
  • 56 K Afghanistan
  • 49 K Namibia
  • 45 K Cuba
  • 45 K Guadeloupe
  • 44 K Burkina Faso
  • 43 K Tajikistan
  • 41 K Brunei Darussalam
  • 40 K Mali
  • 39 K Benin
  • 36 K Somalia
  • 36 K Madagascar
  • 36 K Botswana
  • 35 K Maldives
  • 31 K Rwanda
  • 28 K Bahamas
  • 27 K Guyana
  • 27 K Fiji
  • 26 K Gabon
  • 24 K Togo
  • 22 K Suriname
  • 21 K Papua New Guinea
  • 19 K Bhutan
  • 19 K Malawi
  • 18 K Belize
  • 17 K Gibraltar
  • 16 K Congo
  • 16 K Niger
  • 15 K Sierra Leone
  • 12 K Lesotho
  • 9.8 K Jersey
  • 8.5 K Cape Verde
  • 7.8 K Chad
  • 7.8 K Isle Of Man
  • 7.8 K Andorra
  • 6.8 K Gambia
  • 6.8 K Virgin Islands, U.S.
  • 5.5 K Antigua And Barbuda
  • 5.4 K Timor-Leste
  • 5.3 K Saint Vincent And Grenadines
  • 4.7 K Guernsey
  • 4.5 K Seychelles
  • 4.4 K Burundi
  • 3.9 K Djibouti
  • 2.7 K Greenland
  • 2.7 K Central African Republic
  • 2.4 K Liechtenstein
  • 1.9 K Virgin Islands, British
  • 1.8 K San Marino
  • 1.6 K Dominica
  • 1.4 K Sao Tome And Principe
  • 483 Solomon Islands
  • 423 American Samoa
  • 412 Vanuatu
  • 372 Samoa
  • 278 Anguilla
  • 205 Tonga
  • 166 Cook Islands
  • 161 Micronesia, Federated States Of
  • 109 Kiribati
  • 100 Nauru
  • 39 Montserrat
  • 23 Niue
  • 20 Saint Helena
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