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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
    785 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (5.3 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (497 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

5.3 billion keywords

  • 1,983,654,312 United States
  • 401,299,524 Brazil
  • 265,802,338 France
  • 245,990,024 United Kingdom
  • 137,270,656 Poland
  • 135,331,399 Germany
  • 134,338,804 Spain
  • 116,786,552 Italy
  • 109,648,457 Russian Federation
  • 104,033,707 Mexico
  • 101,026,401 Canada
  • 87,948,728 Argentina
  • 82,883,228 India
  • 80,872,960 Colombia
  • 78,577,568 Japan
  • 74,195,236 Australia
  • 57,080,891 Ukraine
  • 45,682,248 Indonesia
  • 43,993,570 Chile
  • 42,215,665 Turkey
  • 38,900,619 Venezuela
  • 35,143,698 Czech Republic
  • 35,012,440 Philippines
  • 32,680,227 Taiwan
  • 31,359,706 Belgium
  • 31,329,597 Peru
  • 31,025,761 Netherlands
  • 27,726,382 Hungary
  • 26,991,758 Greece
  • 25,815,921 Ecuador
  • 22,738,324 Romania
  • 22,681,005 Finland
  • 22,006,344 Viet Nam
  • 21,529,959 Pakistan
  • 19,472,954 Egypt
  • 19,370,611 Portugal
  • 19,282,691 Algeria
  • 18,764,429 Norway
  • 18,730,991 Malaysia
  • 18,575,371 Sweden
  • 17,559,127 Morocco
  • 16,023,203 New Zealand
  • 15,229,679 Korea
  • 14,909,880 Austria
  • 14,900,876 South Africa
  • 13,835,114 Switzerland
  • 13,567,781 Serbia
  • 13,039,039 Bulgaria
  • 12,826,286 Slovakia
  • 11,899,802 Saudi Arabia
  • 11,844,951 Denmark
  • 10,380,984 Croatia
  • 10,245,478 Belarus
  • 9,924,589 Bolivia
  • 9,683,209 Uruguay
  • 9,009,330 Tunisia
  • 8,920,895 Hong Kong
  • 8,705,175 Kazakhstan
  • 8,530,326 Israel
  • 8,351,858 Ireland
  • 8,236,502 Thailand
  • 8,199,371 Dominican Republic
  • 7,661,534 Singapore
  • 7,470,309 Costa Rica
  • 6,597,049 Lithuania
  • 6,183,393 Slovenia
  • 5,714,525 Sri Lanka
  • 5,538,709 Guatemala
  • 5,386,364 Bangladesh
  • 4,943,957 United Arab Emirates
  • 4,775,081 Bosnia & Herzegovina
  • 4,548,611 Latvia
  • 4,534,975 El Salvador
  • 4,407,776 Panama
  • 4,256,233 Paraguay
  • 4,107,819 Moldova
  • 4,056,610 Estonia
  • 4,010,389 Nigeria
  • 3,308,491 Honduras
  • 2,976,345 Azerbaijan
  • 2,663,336 Armenia
  • 2,431,035 Puerto Rico
  • 2,108,697 Kenya
  • 2,004,763 Jordan
  • 1,968,155 Iraq
  • 1,960,795 Nicaragua
  • 1,924,637 Mauritius
  • 1,919,273 Reunion
  • 1,903,508 Macedonia
  • 1,897,378 Trinidad And Tobago
  • 1,891,140 Georgia
  • 1,645,587 Palestinian Territory
  • 1,582,759 Jamaica
  • 1,388,021 Ghana
  • 1,181,780 Albania
  • 1,160,258 Malta
  • 1,129,548 Qatar
  • 1,023,208 Cyprus
  • 1,018,183 Madagascar
  • 1,010,988 Lebanon
  • 972,543 Luxembourg
  • 965,541 Nepal
  • 957,316 Cote D'Ivoire
  • 940,165 Cameroon
  • 915,551 Kuwait
  • 912,228 Oman
  • 795,994 Senegal
  • 779,423 Montenegro
  • 771,673 Angola
  • 761,888 Iceland
  • 746,909 Guadeloupe
  • 692,331 Martinique
  • 654,620 Yemen
  • 636,558 Bahrain
  • 627,401 Tanzania
  • 615,819 Zimbabwe
  • 614,060 Cambodia
  • 604,170 Kyrgyzstan
  • 568,520 Mozambique
  • 556,551 New Caledonia
  • 500,591 Libya
  • 448,519 Mongolia
  • 390,791 Ethiopia
  • 370,145 Barbados
  • 345,493 French Guiana
  • 342,486 French Polynesia
  • 340,925 Brunei Darussalam
  • 326,800 Zambia
  • 318,171 Namibia
  • 315,092 Guyana
  • 310,542 Haiti
  • 271,574 Fiji
  • 221,867 Botswana
  • 221,733 Afghanistan
  • 219,735 Belize
  • 215,275 Bahamas
  • 204,960 Gabon
  • 203,569 Congo, Democratic Republic
  • 194,216 Maldives
  • 174,382 Mayotte
  • 160,491 Cape Verde
  • 157,251 Suriname
  • 139,238 Guam
  • 121,385 Saint Lucia
  • 120,812 Andorra
  • 117,492 Benin
  • 112,843 Antigua And Barbuda
  • 106,190 Rwanda
  • 103,902 Saint Vincent And Grenadines
  • 97,455 Burkina Faso
  • 96,974 Tajikistan
  • 96,803 Laos
  • 90,740 Aruba
  • 83,280 Grenada
  • 80,477 Djibouti
  • 73,107 Guinea
  • 73,057 Congo
  • 71,471 Togo
  • 70,697 Malawi
  • 69,933 Mauritania
  • 63,463 Monaco
  • 62,121 Saint Kitts And Nevis
  • 60,372 Bhutan
  • 58,412 Cayman Islands
  • 57,597 Seychelles
  • 56,364 Mali
  • 52,670 Faroe Islands
  • 48,103 Virgin Islands, U.S.
  • 38,243 Gibraltar
  • 30,967 Niger
  • 15,485 Equatorial Guinea
Site explorer

497 million keywords

  • 151,419,899 United States
  • 22,965,735 France
  • 21,429,855 Japan
  • 20,460,608 United Kingdom
  • 20,440,123 Germany
  • 18,007,665 India
  • 16,825,778 Brazil
  • 16,443,423 Canada
  • 15,374,797 Italy
  • 14,562,225 Australia
  • 12,503,752 Russian Federation
  • 11,484,572 Spain
  • 11,297,481 Poland
  • 11,296,155 Turkey
  • 11,258,645 Mexico
  • 8,092,661 Indonesia
  • 6,476,750 Netherlands
  • 6,289,622 Argentina
  • 5,706,103 Viet Nam
  • 5,405,566 Colombia
  • 4,962,053 Ukraine
  • 3,522,163 Taiwan
  • 3,359,438 Philippines
  • 3,226,631 Sweden
  • 2,962,350 Chile
  • 2,590,898 Venezuela
  • 2,579,297 Thailand
  • 2,501,829 Peru
  • 2,413,679 Greece
  • 2,384,254 Belgium
  • 2,223,835 Austria
  • 2,209,429 Hungary
  • 2,170,384 Pakistan
  • 2,162,696 Egypt
  • 2,110,358 Malaysia
  • 2,090,207 Denmark
  • 2,028,862 Czech Republic
  • 2,015,063 Romania
  • 1,963,956 Korea
  • 1,814,116 Algeria
  • 1,758,116 Finland
  • 1,728,811 Israel
  • 1,642,087 Saudi Arabia
  • 1,619,958 South Africa
  • 1,586,009 Portugal
  • 1,573,172 Ecuador
  • 1,425,805 Morocco
  • 1,388,696 Switzerland
  • 1,334,538 Hong Kong
  • 1,278,443 Singapore
  • 1,257,154 Norway
  • 1,111,765 Bulgaria
  • 1,057,288 New Zealand
  • 1,009,542 Serbia
  • 979,843 Slovakia
  • 840,582 Kazakhstan
  • 837,159 Ireland
  • 806,349 Croatia
  • 732,439 Belarus
  • 684,039 United Arab Emirates
  • 593,196 Tunisia
  • 577,336 Uruguay
  • 568,291 Dominican Republic
  • 560,195 Bangladesh
  • 556,141 Bolivia
  • 541,546 Sri Lanka
  • 527,991 Lithuania
  • 476,227 Costa Rica
  • 461,128 Slovenia
  • 437,072 Guatemala
  • 401,657 Nigeria
  • 398,031 Iraq
  • 358,338 Azerbaijan
  • 354,176 Bosnia & Herzegovina
  • 312,912 Latvia
  • 294,250 Panama
  • 285,507 El Salvador
  • 276,904 Estonia
  • 265,637 Kenya
  • 255,673 Moldova
  • 253,270 Paraguay
  • 242,476 Jordan
  • 230,592 Armenia
  • 229,843 Puerto Rico
  • 220,019 Honduras
  • 218,576 Georgia
  • 148,582 Palestinian Territory
  • 147,262 Qatar
  • 145,550 Ghana
  • 140,059 Macedonia
  • 136,445 Nicaragua
  • 132,050 Jamaica
  • 131,751 Trinidad And Tobago
  • 129,951 Lebanon
  • 123,684 Kuwait
  • 115,676 Mauritius
  • 113,853 Oman
  • 111,997 Albania
  • 106,185 Nepal
  • 93,834 Cote D'Ivoire
  • 91,160 Tanzania
  • 90,957 Cyprus
  • 77,507 Malta
  • 76,394 Cameroon
  • 75,952 Kyrgyzstan
  • 75,638 Senegal
  • 74,457 Luxembourg
  • 72,648 Cambodia
  • 68,022 Bahrain
  • 63,566 Angola
  • 62,902 Libya
  • 60,758 Iceland
  • 57,870 Mozambique
  • 53,992 Guadeloupe
  • 53,448 Montenegro
  • 53,020 Zimbabwe
  • 50,518 Mongolia
  • 49,355 Madagascar
  • 46,791 Ethiopia
  • 30,077 Haiti
  • 29,998 Zambia
  • 26,966 Namibia
  • 26,909 Brunei Darussalam
  • 26,040 Afghanistan
  • 22,581 Martinique
  • 20,038 Bahamas
  • 19,729 Guyana
  • 19,594 Congo, Democratic Republic
  • 18,770 Fiji
  • 18,425 Maldives
  • 17,811 Laos
  • 17,545 Tajikistan
  • 16,712 Suriname
  • 15,973 New Caledonia
  • 15,643 Botswana
  • 15,406 Gabon
  • 12,894 Burkina Faso
  • 12,654 Belize
  • 11,869 Rwanda
  • 11,064 Benin
  • 10,376 Congo
  • 10,291 Cape Verde
  • 9,785 Mali
  • 8,943 French Polynesia
  • 8,275 Saint Vincent And Grenadines
  • 7,745 Togo
  • 7,237 Andorra
  • 6,899 Bhutan
  • 6,041 Antigua And Barbuda
  • 6,031 Malawi
  • 5,980 Niger
  • 5,399 Djibouti
  • 5,220 Virgin Islands, U.S.
  • 3,967 Barbados
  • 3,777 Mauritania
  • 3,655 Seychelles
  • 3,617 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