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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
    855 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (5.5 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (549 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

5.5 billion keywords

  • 2,091,988,518 United States
  • 417,768,083 Brazil
  • 279,578,281 France
  • 252,021,114 United Kingdom
  • 143,995,706 Poland
  • 142,663,490 Germany
  • 141,236,075 Spain
  • 122,728,111 Italy
  • 115,087,132 Russian Federation
  • 108,420,751 Mexico
  • 104,695,048 Canada
  • 91,591,117 Argentina
  • 86,655,686 India
  • 83,364,158 Colombia
  • 82,339,298 Japan
  • 76,300,724 Australia
  • 60,562,539 Ukraine
  • 47,785,550 Indonesia
  • 45,826,184 Chile
  • 43,969,888 Turkey
  • 40,478,314 Venezuela
  • 37,356,000 Czech Republic
  • 36,825,752 Philippines
  • 34,635,265 Taiwan
  • 33,322,009 Belgium
  • 32,825,875 Netherlands
  • 32,619,871 Peru
  • 29,259,092 Hungary
  • 28,441,283 Greece
  • 27,096,789 Ecuador
  • 23,966,229 Romania
  • 23,904,095 Finland
  • 22,807,475 Viet Nam
  • 22,495,313 Pakistan
  • 20,428,362 Portugal
  • 20,357,679 Egypt
  • 20,111,235 Algeria
  • 19,937,660 Sweden
  • 19,765,129 Malaysia
  • 19,311,192 Norway
  • 18,396,094 Morocco
  • 16,462,013 New Zealand
  • 16,131,143 Korea
  • 15,944,741 Austria
  • 15,619,091 South Africa
  • 14,772,375 Switzerland
  • 14,324,096 Serbia
  • 13,722,658 Bulgaria
  • 13,575,815 Slovakia
  • 12,821,570 Denmark
  • 12,446,276 Saudi Arabia
  • 10,961,700 Croatia
  • 10,819,012 Belarus
  • 10,327,550 Bolivia
  • 10,091,589 Uruguay
  • 9,461,719 Hong Kong
  • 9,438,795 Tunisia
  • 9,233,813 Israel
  • 9,160,588 Kazakhstan
  • 8,841,063 Ireland
  • 8,697,088 Thailand
  • 8,554,121 Dominican Republic
  • 8,406,393 Singapore
  • 7,757,781 Costa Rica
  • 6,963,213 Lithuania
  • 6,552,098 Slovenia
  • 6,007,013 Sri Lanka
  • 5,764,929 Guatemala
  • 5,687,881 Bangladesh
  • 5,203,027 United Arab Emirates
  • 5,028,983 Bosnia & Herzegovina
  • 4,811,994 Latvia
  • 4,710,549 El Salvador
  • 4,574,519 Panama
  • 4,435,088 Paraguay
  • 4,322,161 Moldova
  • 4,316,319 Estonia
  • 4,229,646 Nigeria
  • 3,431,226 Honduras
  • 3,107,208 Azerbaijan
  • 2,779,718 Armenia
  • 2,509,593 Puerto Rico
  • 2,240,341 Kenya
  • 2,105,908 Jordan
  • 2,055,603 Iraq
  • 2,040,075 Reunion
  • 2,037,605 Nicaragua
  • 2,020,985 Mauritius
  • 2,010,111 Macedonia
  • 1,998,248 Trinidad And Tobago
  • 1,988,029 Georgia
  • 1,717,586 Palestinian Territory
  • 1,669,169 Jamaica
  • 1,462,983 Ghana
  • 1,247,432 Albania
  • 1,232,438 Malta
  • 1,188,185 Qatar
  • 1,083,069 Cyprus
  • 1,076,367 Madagascar
  • 1,073,336 Lebanon
  • 1,036,782 Luxembourg
  • 1,036,264 Nepal
  • 1,007,892 Cote D'Ivoire
  • 995,329 Cameroon
  • 960,891 Kuwait
  • 956,234 Oman
  • 837,217 Senegal
  • 822,946 Montenegro
  • 810,283 Iceland
  • 809,055 Angola
  • 792,094 Guadeloupe
  • 734,442 Martinique
  • 687,309 Yemen
  • 668,277 Bahrain
  • 659,761 Cambodia
  • 657,267 Tanzania
  • 650,981 Zimbabwe
  • 641,026 Kyrgyzstan
  • 590,154 Mozambique
  • 588,056 New Caledonia
  • 539,699 Libya
  • 476,830 Mongolia
  • 419,434 Ethiopia
  • 391,815 Barbados
  • 366,247 French Guiana
  • 365,372 French Polynesia
  • 362,737 Brunei Darussalam
  • 344,899 Zambia
  • 333,654 Namibia
  • 332,405 Guyana
  • 326,922 Haiti
  • 284,703 Fiji
  • 234,159 Afghanistan
  • 233,244 Botswana
  • 231,746 Belize
  • 228,737 Bahamas
  • 216,118 Gabon
  • 213,500 Congo, Democratic Republic
  • 204,042 Maldives
  • 185,509 Mayotte
  • 169,782 Cape Verde
  • 166,115 Suriname
  • 149,937 Guam
  • 129,593 Saint Lucia
  • 128,834 Andorra
  • 124,992 Benin
  • 119,335 Antigua And Barbuda
  • 113,619 Rwanda
  • 110,018 Saint Vincent And Grenadines
  • 103,298 Laos
  • 102,884 Burkina Faso
  • 101,884 Tajikistan
  • 96,593 Aruba
  • 88,460 Grenada
  • 84,627 Djibouti
  • 77,894 Congo
  • 75,891 Togo
  • 75,551 Guinea
  • 75,376 Malawi
  • 73,177 Mauritania
  • 68,137 Monaco
  • 66,400 Saint Kitts And Nevis
  • 63,209 Bhutan
  • 62,357 Cayman Islands
  • 60,837 Seychelles
  • 59,388 Mali
  • 56,435 Faroe Islands
  • 50,493 Virgin Islands, U.S.
  • 41,037 Gibraltar
  • 32,392 Niger
  • 16,311 Equatorial Guinea
Site explorer

549 million keywords

  • 185,922,534 United States
  • 25,961,772 Japan
  • 23,571,440 France
  • 20,917,688 Germany
  • 20,706,716 United Kingdom
  • 18,423,370 India
  • 17,159,078 Canada
  • 16,901,314 Brazil
  • 15,847,919 Italy
  • 14,771,486 Australia
  • 12,762,647 Russian Federation
  • 11,728,210 Spain
  • 11,676,212 Mexico
  • 11,675,558 Turkey
  • 11,514,922 Poland
  • 8,318,963 Indonesia
  • 6,675,856 Netherlands
  • 6,511,754 Argentina
  • 5,804,102 Viet Nam
  • 5,522,970 Colombia
  • 5,108,269 Ukraine
  • 4,025,683 Sweden
  • 3,688,178 Taiwan
  • 3,480,168 Philippines
  • 3,366,620 Venezuela
  • 3,075,136 Chile
  • 2,758,108 Austria
  • 2,741,963 Thailand
  • 2,613,781 Peru
  • 2,534,844 Greece
  • 2,527,351 Denmark
  • 2,504,606 Belgium
  • 2,328,756 Hungary
  • 2,274,964 Egypt
  • 2,270,170 Pakistan
  • 2,215,167 Malaysia
  • 2,173,613 Czech Republic
  • 2,124,772 South Africa
  • 2,120,037 Romania
  • 2,076,829 Korea
  • 1,893,407 Algeria
  • 1,856,312 Finland
  • 1,855,039 Israel
  • 1,726,561 Saudi Arabia
  • 1,664,559 Portugal
  • 1,660,606 Norway
  • 1,639,919 Ecuador
  • 1,494,747 Morocco
  • 1,473,810 Switzerland
  • 1,424,789 Singapore
  • 1,404,562 Hong Kong
  • 1,173,141 Bulgaria
  • 1,094,234 New Zealand
  • 1,068,157 Serbia
  • 1,040,920 Slovakia
  • 886,858 Kazakhstan
  • 883,634 Ireland
  • 853,206 Croatia
  • 780,341 Uruguay
  • 772,845 Belarus
  • 718,175 United Arab Emirates
  • 621,766 Tunisia
  • 593,541 Dominican Republic
  • 592,705 Bangladesh
  • 580,249 Bolivia
  • 569,920 Sri Lanka
  • 558,448 Lithuania
  • 496,146 Costa Rica
  • 488,455 Slovenia
  • 452,347 Guatemala
  • 423,446 Nigeria
  • 417,477 Iraq
  • 375,791 Azerbaijan
  • 371,752 Bosnia & Herzegovina
  • 330,219 Latvia
  • 306,126 Panama
  • 296,330 El Salvador
  • 293,213 Estonia
  • 281,174 Kenya
  • 268,969 Moldova
  • 264,662 Paraguay
  • 254,466 Jordan
  • 241,880 Armenia
  • 236,865 Puerto Rico
  • 228,631 Georgia
  • 228,295 Honduras
  • 155,999 Palestinian Territory
  • 155,965 Qatar
  • 154,318 Ghana
  • 147,843 Macedonia
  • 142,205 Nicaragua
  • 139,975 Jamaica
  • 139,181 Trinidad And Tobago
  • 138,023 Lebanon
  • 130,505 Kuwait
  • 121,720 Mauritius
  • 119,109 Oman
  • 118,673 Albania
  • 115,161 Nepal
  • 99,098 Cote D'Ivoire
  • 96,175 Cyprus
  • 96,155 Tanzania
  • 81,989 Malta
  • 80,866 Cameroon
  • 80,795 Kyrgyzstan
  • 79,327 Senegal
  • 78,903 Luxembourg
  • 77,905 Cambodia
  • 71,208 Bahrain
  • 67,452 Libya
  • 66,773 Angola
  • 64,525 Iceland
  • 60,517 Mozambique
  • 56,718 Guadeloupe
  • 56,610 Montenegro
  • 54,707 Zimbabwe
  • 53,716 Mongolia
  • 52,197 Madagascar
  • 49,969 Ethiopia
  • 31,743 Haiti
  • 31,328 Zambia
  • 28,979 Brunei Darussalam
  • 28,287 Namibia
  • 27,400 Afghanistan
  • 22,581 Martinique
  • 21,334 Bahamas
  • 21,035 Guyana
  • 20,472 Congo, Democratic Republic
  • 19,932 Fiji
  • 19,440 Maldives
  • 19,061 Laos
  • 18,459 Tajikistan
  • 17,520 Suriname
  • 16,564 Botswana
  • 16,253 Gabon
  • 15,973 New Caledonia
  • 13,496 Burkina Faso
  • 13,380 Belize
  • 12,605 Rwanda
  • 11,692 Benin
  • 10,928 Congo
  • 10,813 Cape Verde
  • 10,307 Mali
  • 8,943 French Polynesia
  • 8,476 Saint Vincent And Grenadines
  • 8,024 Togo
  • 7,622 Andorra
  • 7,179 Bhutan
  • 6,404 Antigua And Barbuda
  • 6,349 Malawi
  • 6,155 Niger
  • 5,580 Djibouti
  • 5,304 Virgin Islands, U.S.
  • 3,967 Barbados
  • 3,797 Seychelles
  • 3,777 Mauritania
  • 3,729 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