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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
    998 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (7 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (941 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

7 billion keywords

  • 2,895,029,439 United States
  • 494,547,545 Brazil
  • 330,158,585 France
  • 308,785,546 United Kingdom
  • 177,226,925 Germany
  • 172,447,104 Spain
  • 168,793,628 Poland
  • 151,556,312 Italy
  • 133,344,444 Russian Federation
  • 130,640,247 Mexico
  • 129,841,601 Canada
  • 113,014,431 Argentina
  • 106,422,655 Japan
  • 105,729,060 India
  • 98,546,099 Colombia
  • 94,184,525 Australia
  • 72,850,702 Ukraine
  • 56,864,403 Indonesia
  • 55,127,347 Chile
  • 53,254,120 Turkey
  • 47,389,879 Venezuela
  • 46,247,222 Czech Republic
  • 45,136,257 Philippines
  • 43,551,901 Netherlands
  • 42,034,944 Taiwan
  • 40,898,937 Belgium
  • 39,397,799 Peru
  • 35,135,366 Hungary
  • 34,817,823 Greece
  • 32,173,846 Ecuador
  • 28,675,777 Romania
  • 28,571,868 Finland
  • 26,346,013 Viet Nam
  • 26,058,661 Pakistan
  • 25,442,027 Portugal
  • 24,953,577 Sweden
  • 24,586,348 Egypt
  • 24,248,677 Malaysia
  • 22,823,175 Algeria
  • 22,140,510 Norway
  • 21,548,742 Morocco
  • 20,498,818 South Africa
  • 20,015,464 Thailand
  • 19,858,404 Austria
  • 19,712,581 New Zealand
  • 19,428,300 Korea
  • 18,340,074 Switzerland
  • 17,327,957 Serbia
  • 16,436,586 Slovakia
  • 16,393,529 Denmark
  • 16,208,764 Bulgaria
  • 14,789,907 Saudi Arabia
  • 13,328,926 Croatia
  • 12,820,088 Bolivia
  • 12,794,957 Belarus
  • 12,771,184 Hong Kong
  • 12,639,068 Israel
  • 12,331,424 Uruguay
  • 11,672,340 Ireland
  • 11,121,202 Singapore
  • 10,999,688 Tunisia
  • 10,636,859 Kazakhstan
  • 10,273,972 Dominican Republic
  • 9,654,073 Costa Rica
  • 8,342,765 Lithuania
  • 7,859,233 Slovenia
  • 7,403,324 Guatemala
  • 7,270,231 Sri Lanka
  • 7,121,278 Bangladesh
  • 6,514,214 United Arab Emirates
  • 5,977,324 Bosnia & Herzegovina
  • 5,958,345 Panama
  • 5,845,091 El Salvador
  • 5,754,410 Latvia
  • 5,551,964 Nigeria
  • 5,483,894 Paraguay
  • 5,301,339 Estonia
  • 4,999,913 Moldova
  • 4,353,222 Honduras
  • 3,569,055 Azerbaijan
  • 3,174,533 Armenia
  • 3,171,222 Kenya
  • 3,091,483 Puerto Rico
  • 2,836,081 Trinidad And Tobago
  • 2,681,307 Jordan
  • 2,645,861 Mauritius
  • 2,505,979 Reunion
  • 2,450,277 Nicaragua
  • 2,438,744 Macedonia
  • 2,359,133 Georgia
  • 2,349,687 Jamaica
  • 2,250,475 Iraq
  • 1,956,013 Palestinian Territory
  • 1,914,706 Ghana
  • 1,585,510 Malta
  • 1,540,781 Albania
  • 1,492,025 Qatar
  • 1,482,450 Cyprus
  • 1,474,764 Lebanon
  • 1,427,592 Nepal
  • 1,406,666 Zimbabwe
  • 1,332,508 Madagascar
  • 1,311,774 Luxembourg
  • 1,281,583 Cote D'Ivoire
  • 1,261,029 Cameroon
  • 1,258,795 Kuwait
  • 1,191,756 Oman
  • 1,057,577 Senegal
  • 1,019,811 Angola
  • 1,001,190 Iceland
  • 986,017 Montenegro
  • 973,188 Guadeloupe
  • 912,168 Martinique
  • 863,879 Yemen
  • 856,483 Cambodia
  • 838,378 Tanzania
  • 838,273 Bahrain
  • 779,631 Kyrgyzstan
  • 725,565 Mozambique
  • 705,971 New Caledonia
  • 693,221 Libya
  • 586,773 Mongolia
  • 534,419 Ethiopia
  • 474,903 Zambia
  • 456,393 Brunei Darussalam
  • 455,748 Namibia
  • 449,198 French Polynesia
  • 443,702 French Guiana
  • 442,730 Haiti
  • 420,000 Fiji
  • 416,652 Guyana
  • 320,216 Belize
  • 319,794 Botswana
  • 304,737 Bahamas
  • 284,702 Gabon
  • 276,492 Afghanistan
  • 261,365 Congo, Democratic Republic
  • 251,003 Maldives
  • 228,015 Mayotte
  • 222,754 Suriname
  • 218,375 Cape Verde
  • 208,015 Guam
  • 175,617 Saint Lucia
  • 164,754 Antigua And Barbuda
  • 160,215 Benin
  • 159,474 Andorra
  • 158,176 Rwanda
  • 151,019 Laos
  • 138,335 Saint Vincent And Grenadines
  • 130,948 Burkina Faso
  • 129,254 Aruba
  • 118,134 Tajikistan
  • 113,587 Grenada
  • 100,466 Togo
  • 99,963 Djibouti
  • 98,099 Malawi
  • 97,751 Congo
  • 88,797 Mauritania
  • 84,845 Monaco
  • 84,277 Guinea
  • 82,759 Saint Kitts And Nevis
  • 80,053 Cayman Islands
  • 79,688 Bhutan
  • 79,378 Seychelles
  • 75,014 Mali
  • 69,546 Faroe Islands
  • 62,236 Virgin Islands, U.S.
  • 53,055 Gibraltar
  • 41,470 Niger
  • 20,604 Equatorial Guinea
Site explorer

941 million keywords

  • 308,261,708 United States
  • 48,413,914 Japan
  • 42,293,978 France
  • 37,645,612 United Kingdom
  • 37,489,916 Germany
  • 33,877,697 India
  • 32,818,446 Brazil
  • 31,783,556 Canada
  • 29,919,897 Australia
  • 24,956,272 Italy
  • 22,608,561 Russian Federation
  • 22,003,133 Mexico
  • 20,686,201 Turkey
  • 19,202,547 Spain
  • 17,292,588 Poland
  • 17,018,644 Indonesia
  • 11,936,608 Argentina
  • 11,102,815 Ukraine
  • 10,948,965 Netherlands
  • 10,134,311 Colombia
  • 8,954,180 Viet Nam
  • 7,052,000 Sweden
  • 6,813,134 Taiwan
  • 6,425,729 Philippines
  • 5,649,374 Chile
  • 5,207,273 Thailand
  • 4,651,921 Austria
  • 4,634,011 Venezuela
  • 4,423,245 Czech Republic
  • 4,340,357 Peru
  • 4,247,039 Denmark
  • 4,197,632 Greece
  • 4,065,665 Belgium
  • 3,727,516 Hungary
  • 3,624,193 Egypt
  • 3,494,113 Israel
  • 3,451,474 Pakistan
  • 3,320,753 Malaysia
  • 3,173,080 Romania
  • 2,980,175 Korea
  • 2,872,851 Singapore
  • 2,812,665 Norway
  • 2,674,091 Finland
  • 2,628,433 Algeria
  • 2,610,860 Hong Kong
  • 2,281,935 South Africa
  • 2,270,051 Portugal
  • 2,249,106 Saudi Arabia
  • 2,169,611 New Zealand
  • 2,166,268 Ecuador
  • 1,898,769 Switzerland
  • 1,842,912 Morocco
  • 1,510,223 Bulgaria
  • 1,378,948 Serbia
  • 1,352,554 Slovakia
  • 1,198,175 Ireland
  • 1,101,931 Croatia
  • 996,240 Kazakhstan
  • 954,718 Belarus
  • 923,139 United Arab Emirates
  • 762,251 Uruguay
  • 726,191 Bolivia
  • 724,737 Dominican Republic
  • 721,490 Bangladesh
  • 718,662 Tunisia
  • 705,143 Sri Lanka
  • 704,911 Lithuania
  • 639,579 Costa Rica
  • 622,141 Slovenia
  • 584,015 Guatemala
  • 569,941 Nigeria
  • 453,648 Iraq
  • 439,603 Azerbaijan
  • 438,568 Bosnia & Herzegovina
  • 414,824 Latvia
  • 411,681 Panama
  • 393,253 Kenya
  • 393,157 Estonia
  • 377,632 El Salvador
  • 341,120 Paraguay
  • 323,233 Jordan
  • 321,734 Moldova
  • 301,637 Puerto Rico
  • 292,300 Honduras
  • 286,987 Armenia
  • 275,245 Georgia
  • 211,460 Ghana
  • 208,063 Trinidad And Tobago
  • 206,511 Jamaica
  • 191,301 Palestinian Territory
  • 186,106 Qatar
  • 185,326 Macedonia
  • 182,949 Lebanon
  • 173,942 Kuwait
  • 172,246 Nicaragua
  • 170,356 Mauritius
  • 160,813 Nepal
  • 149,295 Albania
  • 138,291 Cyprus
  • 133,603 Oman
  • 128,782 Tanzania
  • 127,923 Cote D'Ivoire
  • 114,777 Malta
  • 103,966 Luxembourg
  • 102,092 Cameroon
  • 101,732 Senegal
  • 100,143 Kyrgyzstan
  • 98,811 Cambodia
  • 86,854 Angola
  • 86,589 Bahrain
  • 84,670 Iceland
  • 83,984 Libya
  • 79,782 Guadeloupe
  • 73,280 Zimbabwe
  • 72,269 Mozambique
  • 71,063 Montenegro
  • 68,052 Madagascar
  • 67,864 Mongolia
  • 62,346 Ethiopia
  • 43,069 Namibia
  • 42,659 Haiti
  • 40,659 Zambia
  • 35,799 Brunei Darussalam
  • 31,460 Afghanistan
  • 31,447 Fiji
  • 28,986 Bahamas
  • 28,792 Laos
  • 27,541 Guyana
  • 27,410 Suriname
  • 25,336 Congo, Democratic Republic
  • 24,955 Maldives
  • 24,487 Botswana
  • 23,333 Gabon
  • 22,965 Tajikistan
  • 20,303 Rwanda
  • 19,467 Belize
  • 18,375 Burkina Faso
  • 16,450 Congo
  • 16,013 Benin
  • 15,952 Cape Verde
  • 14,488 Mali
  • 12,990 Togo
  • 12,062 Saint Vincent And Grenadines
  • 11,605 Bhutan
  • 11,228 Andorra
  • 10,232 Antigua And Barbuda
  • 9,955 Niger
  • 9,309 Malawi
  • 8,087 Djibouti
  • 6,666 Virgin Islands, U.S.
  • 5,863 Seychelles
  • 5,553 Gibraltar
  • 8 New Caledonia
  • 4 Mauritania
  • 2 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