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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
    1.8 million new pages
  • Every 24 hours we update metrics for
    72 million pages
  • Total content index size
    1 billion pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (7.3 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (472 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

7.3 billion keywords

  • 3,021,290,034 United States
  • 508,441,662 Brazil
  • 338,000,204 France
  • 313,785,283 United Kingdom
  • 182,373,943 Germany
  • 177,279,743 Spain
  • 172,489,693 Poland
  • 155,338,974 Italy
  • 136,363,779 Russian Federation
  • 134,279,833 Mexico
  • 132,426,465 Canada
  • 116,571,577 Argentina
  • 108,692,519 Japan
  • 108,055,600 India
  • 100,896,463 Colombia
  • 95,952,075 Australia
  • 75,087,406 Ukraine
  • 58,189,903 Indonesia
  • 56,775,899 Chile
  • 54,625,872 Turkey
  • 48,469,605 Venezuela
  • 47,798,064 Czech Republic
  • 46,548,168 Philippines
  • 44,947,249 Netherlands
  • 43,384,279 Taiwan
  • 42,149,631 Belgium
  • 40,660,772 Peru
  • 36,140,817 Hungary
  • 35,883,494 Greece
  • 33,143,932 Ecuador
  • 29,476,365 Romania
  • 29,357,160 Finland
  • 26,869,166 Viet Nam
  • 26,760,994 Pakistan
  • 26,267,052 Portugal
  • 25,754,105 Sweden
  • 25,314,556 Egypt
  • 25,037,006 Malaysia
  • 23,340,775 Algeria
  • 22,465,498 Norway
  • 22,057,920 Morocco
  • 21,309,833 South Africa
  • 21,023,838 Thailand
  • 20,418,150 Austria
  • 20,077,545 Korea
  • 20,052,269 New Zealand
  • 18,956,988 Switzerland
  • 17,815,198 Serbia
  • 16,983,023 Denmark
  • 16,923,279 Slovakia
  • 16,626,928 Bulgaria
  • 15,230,230 Saudi Arabia
  • 13,711,985 Croatia
  • 13,255,965 Hong Kong
  • 13,252,509 Bolivia
  • 13,180,090 Israel
  • 13,141,676 Belarus
  • 12,684,325 Uruguay
  • 12,135,500 Ireland
  • 11,553,530 Singapore
  • 11,270,256 Tunisia
  • 10,942,193 Kazakhstan
  • 10,573,122 Dominican Republic
  • 9,933,150 Costa Rica
  • 8,582,748 Lithuania
  • 8,077,530 Slovenia
  • 7,603,699 Guatemala
  • 7,498,958 Sri Lanka
  • 7,396,294 Bangladesh
  • 6,746,771 United Arab Emirates
  • 6,161,557 Panama
  • 6,127,979 Bosnia & Herzegovina
  • 6,013,244 El Salvador
  • 5,914,046 Latvia
  • 5,772,242 Nigeria
  • 5,654,298 Paraguay
  • 5,482,583 Estonia
  • 5,113,120 Moldova
  • 4,500,690 Honduras
  • 3,649,538 Azerbaijan
  • 3,340,689 Kenya
  • 3,236,132 Armenia
  • 3,188,942 Puerto Rico
  • 2,957,316 Trinidad And Tobago
  • 2,768,970 Jordan
  • 2,738,974 Mauritius
  • 2,585,029 Reunion
  • 2,516,623 Nicaragua
  • 2,511,494 Macedonia
  • 2,456,154 Jamaica
  • 2,431,781 Georgia
  • 2,311,433 Iraq
  • 2,004,307 Palestinian Territory
  • 1,990,054 Ghana
  • 1,642,295 Malta
  • 1,591,652 Albania
  • 1,544,935 Qatar
  • 1,540,366 Cyprus
  • 1,536,057 Lebanon
  • 1,492,860 Nepal
  • 1,447,510 Zimbabwe
  • 1,379,447 Madagascar
  • 1,356,231 Luxembourg
  • 1,328,085 Cote D'Ivoire
  • 1,305,803 Cameroon
  • 1,305,583 Kuwait
  • 1,235,389 Oman
  • 1,093,353 Senegal
  • 1,058,714 Angola
  • 1,036,595 Iceland
  • 1,012,968 Montenegro
  • 1,002,254 Guadeloupe
  • 940,945 Martinique
  • 889,563 Yemen
  • 888,337 Cambodia
  • 868,750 Tanzania
  • 866,858 Bahrain
  • 805,479 Kyrgyzstan
  • 746,996 Mozambique
  • 724,422 New Caledonia
  • 722,215 Libya
  • 612,957 Mongolia
  • 561,961 Ethiopia
  • 497,552 Zambia
  • 477,647 Namibia
  • 474,136 Brunei Darussalam
  • 463,421 French Polynesia
  • 460,958 Haiti
  • 455,952 French Guiana
  • 442,292 Fiji
  • 431,678 Guyana
  • 336,590 Belize
  • 334,612 Botswana
  • 317,468 Bahamas
  • 295,242 Gabon
  • 284,062 Afghanistan
  • 271,190 Congo, Democratic Republic
  • 259,545 Maldives
  • 234,510 Mayotte
  • 231,442 Suriname
  • 226,078 Cape Verde
  • 216,669 Guam
  • 183,838 Saint Lucia
  • 171,223 Antigua And Barbuda
  • 167,763 Rwanda
  • 166,841 Benin
  • 164,150 Andorra
  • 158,847 Laos
  • 143,197 Saint Vincent And Grenadines
  • 135,766 Burkina Faso
  • 134,383 Aruba
  • 122,020 Tajikistan
  • 119,121 Grenada
  • 105,095 Togo
  • 102,882 Djibouti
  • 102,683 Malawi
  • 100,746 Congo
  • 91,076 Mauritania
  • 87,433 Monaco
  • 86,330 Guinea
  • 85,622 Saint Kitts And Nevis
  • 82,976 Bhutan
  • 82,697 Seychelles
  • 82,670 Cayman Islands
  • 78,184 Mali
  • 71,742 Faroe Islands
  • 64,023 Virgin Islands, U.S.
  • 54,894 Gibraltar
  • 42,785 Niger
  • 21,408 Equatorial Guinea
Site explorer

472 million keywords

  • 150,136,571 United States
  • 24,940,202 Japan
  • 20,921,645 Germany
  • 20,114,563 United Kingdom
  • 19,945,966 France
  • 17,367,939 Brazil
  • 17,298,750 Canada
  • 16,337,657 Australia
  • 16,248,305 India
  • 13,633,336 Italy
  • 12,273,073 Russian Federation
  • 10,458,287 Spain
  • 10,118,279 Turkey
  • 9,377,569 Poland
  • 8,973,277 Mexico
  • 8,270,064 Indonesia
  • 5,925,072 Netherlands
  • 5,132,364 Ukraine
  • 4,850,195 Viet Nam
  • 4,736,102 Argentina
  • 3,993,534 Thailand
  • 3,749,839 Colombia
  • 3,491,021 Sweden
  • 2,979,747 Taiwan
  • 2,897,855 Philippines
  • 2,710,741 Chile
  • 2,401,901 Venezuela
  • 2,318,811 Austria
  • 2,184,493 Denmark
  • 2,128,661 Czech Republic
  • 1,980,406 Peru
  • 1,894,983 Israel
  • 1,889,005 Greece
  • 1,807,906 Belgium
  • 1,742,756 Egypt
  • 1,672,845 Hungary
  • 1,579,467 Pakistan
  • 1,555,504 Singapore
  • 1,526,895 Malaysia
  • 1,517,616 Norway
  • 1,455,912 Romania
  • 1,426,504 Hong Kong
  • 1,395,392 Korea
  • 1,340,572 Finland
  • 1,214,587 Portugal
  • 1,181,861 New Zealand
  • 1,181,298 South Africa
  • 1,140,655 Algeria
  • 1,109,156 Ecuador
  • 1,086,011 Saudi Arabia
  • 1,018,251 Switzerland
  • 944,504 Morocco
  • 826,254 Bulgaria
  • 754,498 Serbia
  • 741,467 Slovakia
  • 656,052 Ireland
  • 600,453 Croatia
  • 541,107 Kazakhstan
  • 518,440 Belarus
  • 505,007 United Arab Emirates
  • 411,879 Uruguay
  • 397,316 Bangladesh
  • 394,642 Bolivia
  • 393,672 Dominican Republic
  • 390,837 Tunisia
  • 389,309 Sri Lanka
  • 384,116 Lithuania
  • 348,769 Costa Rica
  • 335,819 Slovenia
  • 318,060 Guatemala
  • 313,125 Nigeria
  • 251,953 Iraq
  • 241,934 Azerbaijan
  • 237,596 Bosnia & Herzegovina
  • 226,051 Latvia
  • 224,703 Panama
  • 218,299 Kenya
  • 214,614 Estonia
  • 205,523 El Salvador
  • 186,366 Paraguay
  • 179,083 Jordan
  • 175,351 Moldova
  • 165,960 Puerto Rico
  • 159,246 Honduras
  • 155,755 Armenia
  • 150,859 Georgia
  • 116,323 Ghana
  • 114,486 Trinidad And Tobago
  • 114,080 Jamaica
  • 105,762 Palestinian Territory
  • 102,876 Qatar
  • 101,451 Macedonia
  • 100,328 Lebanon
  • 95,275 Kuwait
  • 93,864 Mauritius
  • 93,794 Nicaragua
  • 89,180 Nepal
  • 81,732 Albania
  • 76,389 Cyprus
  • 74,276 Oman
  • 70,534 Tanzania
  • 70,523 Cote D'Ivoire
  • 63,041 Malta
  • 56,882 Luxembourg
  • 56,316 Senegal
  • 56,125 Cameroon
  • 55,850 Kyrgyzstan
  • 53,989 Cambodia
  • 48,070 Angola
  • 47,440 Bahrain
  • 47,062 Libya
  • 46,381 Iceland
  • 43,805 Guadeloupe
  • 40,915 Zimbabwe
  • 39,903 Mozambique
  • 39,120 Montenegro
  • 37,695 Madagascar
  • 37,681 Mongolia
  • 34,650 Ethiopia
  • 24,037 Namibia
  • 23,893 Haiti
  • 22,733 Zambia
  • 20,074 Brunei Darussalam
  • 18,001 Fiji
  • 17,495 Afghanistan
  • 16,197 Bahamas
  • 15,993 Laos
  • 15,440 Guyana
  • 15,201 Suriname
  • 14,076 Congo, Democratic Republic
  • 13,838 Maldives
  • 13,692 Botswana
  • 13,008 Gabon
  • 12,985 Tajikistan
  • 11,369 Rwanda
  • 10,847 Belize
  • 10,098 Burkina Faso
  • 9,142 Congo
  • 8,843 Benin
  • 8,812 Cape Verde
  • 8,017 Mali
  • 7,172 Togo
  • 6,600 Saint Vincent And Grenadines
  • 6,336 Bhutan
  • 6,087 Andorra
  • 5,623 Antigua And Barbuda
  • 5,448 Niger
  • 5,163 Malawi
  • 4,430 Djibouti
  • 3,608 Virgin Islands, U.S.
  • 3,359 Seychelles
  • 3,032 Gibraltar
  • 5 New Caledonia
  • 2 Mauritania
  • 1 Monaco

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