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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
    784 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 (495 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

495 million keywords

  • 149,446,294 United States
  • 22,883,126 France
  • 21,341,807 Japan
  • 20,434,893 United Kingdom
  • 20,396,786 Germany
  • 17,994,491 India
  • 16,812,055 Brazil
  • 16,366,468 Canada
  • 15,359,677 Italy
  • 14,555,314 Australia
  • 12,499,026 Russian Federation
  • 11,455,951 Spain
  • 11,294,877 Turkey
  • 11,294,153 Poland
  • 11,256,058 Mexico
  • 8,090,040 Indonesia
  • 6,471,274 Netherlands
  • 6,288,872 Argentina
  • 5,702,431 Viet Nam
  • 5,403,649 Colombia
  • 4,961,792 Ukraine
  • 3,521,842 Taiwan
  • 3,358,874 Philippines
  • 3,226,432 Sweden
  • 2,960,623 Chile
  • 2,589,276 Venezuela
  • 2,578,839 Thailand
  • 2,501,413 Peru
  • 2,413,041 Greece
  • 2,383,290 Belgium
  • 2,223,675 Austria
  • 2,208,406 Hungary
  • 2,170,069 Pakistan
  • 2,161,627 Egypt
  • 2,109,936 Malaysia
  • 2,089,415 Denmark
  • 2,028,463 Czech Republic
  • 2,014,840 Romania
  • 1,963,549 Korea
  • 1,813,227 Algeria
  • 1,757,366 Finland
  • 1,728,516 Israel
  • 1,641,844 Saudi Arabia
  • 1,618,740 South Africa
  • 1,585,796 Portugal
  • 1,572,497 Ecuador
  • 1,425,574 Morocco
  • 1,387,745 Switzerland
  • 1,333,741 Hong Kong
  • 1,278,348 Singapore
  • 1,257,039 Norway
  • 1,111,337 Bulgaria
  • 1,057,172 New Zealand
  • 1,009,420 Serbia
  • 979,730 Slovakia
  • 840,453 Kazakhstan
  • 836,834 Ireland
  • 806,066 Croatia
  • 731,998 Belarus
  • 683,973 United Arab Emirates
  • 593,124 Tunisia
  • 576,953 Uruguay
  • 568,037 Dominican Republic
  • 560,028 Bangladesh
  • 555,949 Bolivia
  • 541,453 Sri Lanka
  • 527,881 Lithuania
  • 475,985 Costa Rica
  • 461,066 Slovenia
  • 436,963 Guatemala
  • 401,582 Nigeria
  • 397,929 Iraq
  • 358,250 Azerbaijan
  • 354,096 Bosnia & Herzegovina
  • 312,865 Latvia
  • 294,188 Panama
  • 285,488 El Salvador
  • 276,745 Estonia
  • 265,568 Kenya
  • 255,632 Moldova
  • 253,246 Paraguay
  • 242,438 Jordan
  • 230,572 Armenia
  • 229,833 Puerto Rico
  • 219,948 Honduras
  • 218,502 Georgia
  • 148,561 Palestinian Territory
  • 147,236 Qatar
  • 145,511 Ghana
  • 140,031 Macedonia
  • 136,424 Nicaragua
  • 132,016 Jamaica
  • 131,743 Trinidad And Tobago
  • 129,937 Lebanon
  • 123,658 Kuwait
  • 115,651 Mauritius
  • 113,825 Oman
  • 111,987 Albania
  • 106,158 Nepal
  • 93,794 Cote D'Ivoire
  • 91,152 Tanzania
  • 90,916 Cyprus
  • 77,495 Malta
  • 76,340 Cameroon
  • 75,942 Kyrgyzstan
  • 75,629 Senegal
  • 74,442 Luxembourg
  • 72,628 Cambodia
  • 67,993 Bahrain
  • 63,563 Angola
  • 62,893 Libya
  • 60,733 Iceland
  • 57,862 Mozambique
  • 53,975 Guadeloupe
  • 53,438 Montenegro
  • 52,953 Zimbabwe
  • 50,512 Mongolia
  • 49,345 Madagascar
  • 46,768 Ethiopia
  • 30,068 Haiti
  • 29,974 Zambia
  • 26,960 Namibia
  • 26,893 Brunei Darussalam
  • 26,037 Afghanistan
  • 22,581 Martinique
  • 20,024 Bahamas
  • 19,717 Guyana
  • 19,582 Congo, Democratic Republic
  • 18,762 Fiji
  • 18,424 Maldives
  • 17,811 Laos
  • 17,544 Tajikistan
  • 16,711 Suriname
  • 15,973 New Caledonia
  • 15,636 Botswana
  • 15,403 Gabon
  • 12,888 Burkina Faso
  • 12,647 Belize
  • 11,869 Rwanda
  • 11,062 Benin
  • 10,365 Congo
  • 10,288 Cape Verde
  • 9,784 Mali
  • 8,943 French Polynesia
  • 8,273 Saint Vincent And Grenadines
  • 7,745 Togo
  • 7,237 Andorra
  • 6,898 Bhutan
  • 6,041 Antigua And Barbuda
  • 6,030 Malawi
  • 5,979 Niger
  • 5,395 Djibouti
  • 5,219 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