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Bringing Big Data to SEO Professionals - Ahrefs

Ahrefs in numbers

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 biggest third party database of search queries with refined monthly search volume and advanced keyword research metrics.

Browse this page to explore the scale of data that powers Ahrefs marketing tools.

Content index

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

  • Every 24 hours we discover
    5 million new pages
  • Every 24 hours we update metrics for
    72 million pages
  • Total content index size
    828 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (5.4 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (530 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

5.4 billion keywords

  • 2,036,301,017 United States
  • 409,252,783 Brazil
  • 272,446,245 France
  • 248,805,125 United Kingdom
  • 140,441,862 Poland
  • 138,805,126 Germany
  • 137,656,016 Spain
  • 119,595,678 Italy
  • 112,336,536 Russian Federation
  • 106,062,605 Mexico
  • 102,789,763 Canada
  • 89,808,288 Argentina
  • 84,774,940 India
  • 82,047,534 Colombia
  • 80,418,293 Japan
  • 75,208,522 Australia
  • 58,802,744 Ukraine
  • 46,711,016 Indonesia
  • 44,947,837 Chile
  • 43,119,949 Turkey
  • 39,612,102 Venezuela
  • 36,184,288 Czech Republic
  • 35,853,752 Philippines
  • 33,655,619 Taiwan
  • 32,319,159 Belgium
  • 32,039,856 Peru
  • 31,891,267 Netherlands
  • 28,460,170 Hungary
  • 27,692,319 Greece
  • 26,389,495 Ecuador
  • 23,303,837 Romania
  • 23,267,721 Finland
  • 22,410,658 Viet Nam
  • 22,004,552 Pakistan
  • 19,921,010 Egypt
  • 19,874,153 Portugal
  • 19,702,953 Algeria
  • 19,353,542 Sweden
  • 19,251,636 Malaysia
  • 19,074,547 Norway
  • 17,988,563 Morocco
  • 16,231,285 New Zealand
  • 15,682,394 Korea
  • 15,473,506 Austria
  • 15,219,940 South Africa
  • 14,280,511 Switzerland
  • 13,942,584 Serbia
  • 13,364,055 Bulgaria
  • 13,181,601 Slovakia
  • 12,400,211 Denmark
  • 12,192,182 Saudi Arabia
  • 10,656,632 Croatia
  • 10,531,585 Belarus
  • 10,129,396 Bolivia
  • 9,891,695 Uruguay
  • 9,228,592 Tunisia
  • 9,190,230 Hong Kong
  • 8,932,175 Kazakhstan
  • 8,783,878 Israel
  • 8,583,169 Ireland
  • 8,459,814 Thailand
  • 8,374,158 Dominican Republic
  • 7,896,608 Singapore
  • 7,606,574 Costa Rica
  • 6,772,252 Lithuania
  • 6,356,929 Slovenia
  • 5,861,621 Sri Lanka
  • 5,618,434 Guatemala
  • 5,544,899 Bangladesh
  • 5,071,004 United Arab Emirates
  • 4,902,310 Bosnia & Herzegovina
  • 4,676,925 Latvia
  • 4,612,193 El Salvador
  • 4,490,073 Panama
  • 4,344,276 Paraguay
  • 4,215,589 Moldova
  • 4,181,258 Estonia
  • 4,113,720 Nigeria
  • 3,367,958 Honduras
  • 3,042,020 Azerbaijan
  • 2,721,275 Armenia
  • 2,465,883 Puerto Rico
  • 2,170,305 Kenya
  • 2,056,597 Jordan
  • 2,013,722 Iraq
  • 1,996,717 Nicaragua
  • 1,976,607 Reunion
  • 1,969,066 Mauritius
  • 1,956,194 Macedonia
  • 1,945,177 Trinidad And Tobago
  • 1,938,702 Georgia
  • 1,682,270 Palestinian Territory
  • 1,623,612 Jamaica
  • 1,424,026 Ghana
  • 1,214,173 Albania
  • 1,193,992 Malta
  • 1,158,369 Qatar
  • 1,052,545 Cyprus
  • 1,045,674 Madagascar
  • 1,041,582 Lebanon
  • 1,003,116 Luxembourg
  • 1,000,344 Nepal
  • 981,204 Cote D'Ivoire
  • 966,694 Cameroon
  • 938,294 Kuwait
  • 936,031 Oman
  • 815,761 Senegal
  • 801,915 Montenegro
  • 789,214 Angola
  • 784,554 Iceland
  • 768,124 Guadeloupe
  • 712,189 Martinique
  • 671,071 Yemen
  • 653,025 Bahrain
  • 642,021 Tanzania
  • 636,213 Cambodia
  • 631,199 Zimbabwe
  • 622,918 Kyrgyzstan
  • 579,329 Mozambique
  • 572,344 New Caledonia
  • 519,736 Libya
  • 463,070 Mongolia
  • 405,759 Ethiopia
  • 380,673 Barbados
  • 355,504 French Guiana
  • 353,587 French Polynesia
  • 351,039 Brunei Darussalam
  • 335,269 Zambia
  • 324,960 Namibia
  • 322,535 Guyana
  • 318,664 Haiti
  • 277,684 Fiji
  • 227,796 Afghanistan
  • 226,838 Botswana
  • 224,703 Belize
  • 221,290 Bahamas
  • 210,259 Gabon
  • 208,196 Congo, Democratic Republic
  • 199,006 Maldives
  • 179,675 Mayotte
  • 164,985 Cape Verde
  • 161,233 Suriname
  • 144,303 Guam
  • 125,064 Saint Lucia
  • 124,650 Andorra
  • 120,999 Benin
  • 116,037 Antigua And Barbuda
  • 109,708 Rwanda
  • 106,566 Saint Vincent And Grenadines
  • 99,983 Burkina Faso
  • 99,757 Laos
  • 99,369 Tajikistan
  • 93,453 Aruba
  • 85,535 Grenada
  • 82,607 Djibouti
  • 75,610 Congo
  • 74,394 Guinea
  • 73,654 Togo
  • 72,912 Malawi
  • 71,552 Mauritania
  • 65,624 Monaco
  • 64,188 Saint Kitts And Nevis
  • 61,844 Bhutan
  • 60,258 Cayman Islands
  • 59,126 Seychelles
  • 57,909 Mali
  • 54,521 Faroe Islands
  • 49,162 Virgin Islands, U.S.
  • 39,525 Gibraltar
  • 31,633 Niger
  • 15,891 Equatorial Guinea
Site explorer

530 million keywords

  • 173,031,540 United States
  • 23,787,317 Japan
  • 23,211,056 France
  • 20,600,771 Germany
  • 20,552,761 United Kingdom
  • 18,420,589 India
  • 16,899,695 Brazil
  • 16,751,408 Canada
  • 15,503,855 Italy
  • 14,619,322 Australia
  • 12,555,582 Russian Federation
  • 11,574,916 Spain
  • 11,396,123 Turkey
  • 11,375,150 Mexico
  • 11,340,356 Poland
  • 8,160,949 Indonesia
  • 6,542,888 Netherlands
  • 6,359,878 Argentina
  • 5,963,482 Venezuela
  • 5,705,425 Viet Nam
  • 5,452,270 Colombia
  • 4,987,236 Ukraine
  • 3,551,404 Taiwan
  • 3,413,785 South Africa
  • 3,389,303 Philippines
  • 3,240,798 Sweden
  • 3,001,849 Chile
  • 2,603,612 Thailand
  • 2,525,606 Peru
  • 2,445,237 Greece
  • 2,415,092 Belgium
  • 2,236,600 Hungary
  • 2,234,554 Austria
  • 2,191,203 Egypt
  • 2,186,560 Pakistan
  • 2,127,210 Malaysia
  • 2,108,661 Denmark
  • 2,039,736 Czech Republic
  • 2,033,599 Romania
  • 1,980,168 Korea
  • 1,834,974 Algeria
  • 1,787,743 Finland
  • 1,734,121 Israel
  • 1,656,427 Saudi Arabia
  • 1,598,479 Portugal
  • 1,590,011 Ecuador
  • 1,435,622 Morocco
  • 1,409,434 Switzerland
  • 1,353,594 Uruguay
  • 1,352,265 Hong Kong
  • 1,284,844 Singapore
  • 1,262,567 Norway
  • 1,124,465 Bulgaria
  • 1,063,801 New Zealand
  • 1,016,863 Serbia
  • 987,462 Slovakia
  • 847,068 Kazakhstan
  • 846,583 Ireland
  • 813,782 Croatia
  • 742,594 Belarus
  • 691,400 United Arab Emirates
  • 597,060 Tunisia
  • 574,448 Dominican Republic
  • 565,628 Bangladesh
  • 561,822 Bolivia
  • 546,050 Sri Lanka
  • 532,705 Lithuania
  • 481,876 Costa Rica
  • 465,043 Slovenia
  • 440,189 Guatemala
  • 405,275 Nigeria
  • 401,551 Iraq
  • 361,464 Azerbaijan
  • 356,920 Bosnia & Herzegovina
  • 315,731 Latvia
  • 296,823 Panama
  • 287,169 El Salvador
  • 280,555 Estonia
  • 268,301 Kenya
  • 257,441 Moldova
  • 255,354 Paraguay
  • 244,061 Jordan
  • 232,906 Armenia
  • 230,651 Puerto Rico
  • 221,796 Honduras
  • 221,416 Georgia
  • 149,705 Palestinian Territory
  • 148,476 Qatar
  • 147,596 Ghana
  • 141,200 Macedonia
  • 137,749 Nicaragua
  • 133,424 Jamaica
  • 132,845 Trinidad And Tobago
  • 131,033 Lebanon
  • 124,686 Kuwait
  • 116,609 Mauritius
  • 114,900 Oman
  • 113,143 Albania
  • 107,461 Nepal
  • 95,007 Cote D'Ivoire
  • 92,136 Cyprus
  • 91,739 Tanzania
  • 78,202 Malta
  • 77,474 Cameroon
  • 76,588 Kyrgyzstan
  • 76,049 Senegal
  • 75,119 Luxembourg
  • 73,601 Cambodia
  • 68,748 Bahrain
  • 64,199 Angola
  • 63,513 Libya
  • 61,349 Iceland
  • 58,350 Mozambique
  • 54,543 Guadeloupe
  • 53,990 Zimbabwe
  • 53,861 Montenegro
  • 50,954 Mongolia
  • 49,828 Madagascar
  • 47,740 Ethiopia
  • 30,378 Haiti
  • 30,352 Zambia
  • 27,338 Brunei Darussalam
  • 27,169 Namibia
  • 26,263 Afghanistan
  • 22,581 Martinique
  • 20,289 Bahamas
  • 20,031 Guyana
  • 19,864 Congo, Democratic Republic
  • 19,148 Fiji
  • 18,563 Maldives
  • 17,991 Laos
  • 17,666 Tajikistan
  • 16,808 Suriname
  • 15,973 New Caledonia
  • 15,879 Botswana
  • 15,672 Gabon
  • 13,023 Burkina Faso
  • 12,819 Belize
  • 11,988 Rwanda
  • 11,188 Benin
  • 10,490 Congo
  • 10,412 Cape Verde
  • 9,853 Mali
  • 8,943 French Polynesia
  • 8,284 Saint Vincent And Grenadines
  • 7,787 Togo
  • 7,317 Andorra
  • 6,963 Bhutan
  • 6,114 Antigua And Barbuda
  • 6,072 Malawi
  • 6,009 Niger
  • 5,425 Djibouti
  • 5,204 Virgin Islands, U.S.
  • 3,967 Barbados
  • 3,777 Mauritania
  • 3,678 Seychelles
  • 3,640 Gibraltar
  • 3,148 Guam
  • 2,928 Monaco
  • 2,174 Saint Kitts And Nevis
  • 1,531 Guinea
  • 1,516 Reunion
  • 1,075 Grenada
  • 770 Faroe Islands
  • 460 Aruba
  • 417 Yemen
  • 410 Equatorial Guinea
  • 85 Mayotte
  • 18 Cayman Islands
  • 9 Saint Lucia
  • 5 French Guiana

Server fleet

Above anything, 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.

2.5K Servers

  • 38,000 CPU cores
  • 256TB RAM
  • 25PB HDD
  • 2.5PB SSD