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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
    751 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (5.1 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (478 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

5.1 billion keywords

  • 1,899,159,358 United States
  • 391,238,804 Brazil
  • 258,539,508 France
  • 242,776,905 United Kingdom
  • 133,771,483 Poland
  • 131,584,556 Germany
  • 130,513,112 Spain
  • 113,496,906 Italy
  • 106,810,128 Russian Federation
  • 101,018,245 Mexico
  • 99,069,721 Canada
  • 85,605,984 Argentina
  • 80,859,545 India
  • 78,801,427 Colombia
  • 76,605,250 Japan
  • 73,016,214 Australia
  • 55,304,550 Ukraine
  • 44,297,613 Indonesia
  • 42,712,271 Chile
  • 41,245,899 Turkey
  • 37,882,148 Venezuela
  • 34,007,665 Czech Republic
  • 33,944,815 Philippines
  • 31,508,499 Taiwan
  • 30,395,106 Peru
  • 30,358,690 Belgium
  • 30,084,095 Netherlands
  • 26,929,793 Hungary
  • 26,232,292 Greece
  • 25,048,868 Ecuador
  • 22,101,216 Romania
  • 22,038,641 Finland
  • 21,561,649 Viet Nam
  • 21,039,416 Pakistan
  • 19,016,389 Egypt
  • 18,857,889 Algeria
  • 18,797,960 Portugal
  • 18,511,081 Norway
  • 18,133,368 Malaysia
  • 17,986,045 Sweden
  • 17,144,010 Morocco
  • 15,784,391 New Zealand
  • 14,758,586 Korea
  • 14,478,005 South Africa
  • 14,462,020 Austria
  • 13,353,355 Switzerland
  • 13,188,787 Serbia
  • 12,690,410 Bulgaria
  • 12,444,057 Slovakia
  • 11,587,751 Saudi Arabia
  • 11,420,050 Denmark
  • 10,085,175 Croatia
  • 9,950,955 Belarus
  • 9,632,399 Bolivia
  • 9,425,024 Uruguay
  • 8,782,919 Tunisia
  • 8,608,886 Hong Kong
  • 8,462,772 Kazakhstan
  • 8,270,217 Israel
  • 8,078,170 Ireland
  • 7,978,103 Thailand
  • 7,969,592 Dominican Republic
  • 7,391,406 Singapore
  • 7,273,888 Costa Rica
  • 6,403,457 Lithuania
  • 5,996,247 Slovenia
  • 5,563,502 Sri Lanka
  • 5,422,798 Guatemala
  • 5,224,090 Bangladesh
  • 4,803,390 United Arab Emirates
  • 4,646,606 Bosnia & Herzegovina
  • 4,426,560 El Salvador
  • 4,414,248 Latvia
  • 4,276,495 Panama
  • 4,139,239 Paraguay
  • 3,996,594 Moldova
  • 3,922,199 Estonia
  • 3,890,104 Nigeria
  • 3,223,499 Honduras
  • 2,909,763 Azerbaijan
  • 2,602,790 Armenia
  • 2,402,146 Puerto Rico
  • 2,035,222 Kenya
  • 1,953,339 Jordan
  • 1,922,395 Iraq
  • 1,908,643 Nicaragua
  • 1,868,719 Mauritius
  • 1,852,100 Reunion
  • 1,849,570 Macedonia
  • 1,843,455 Georgia
  • 1,837,366 Trinidad And Tobago
  • 1,606,049 Palestinian Territory
  • 1,529,075 Jamaica
  • 1,347,310 Ghana
  • 1,147,222 Albania
  • 1,122,002 Malta
  • 1,097,858 Qatar
  • 990,871 Cyprus
  • 986,895 Madagascar
  • 978,836 Lebanon
  • 940,478 Luxembourg
  • 931,505 Nepal
  • 930,349 Cote D'Ivoire
  • 911,200 Cameroon
  • 890,705 Kuwait
  • 887,100 Oman
  • 775,689 Senegal
  • 756,737 Montenegro
  • 751,256 Angola
  • 735,337 Iceland
  • 724,382 Guadeloupe
  • 668,894 Martinique
  • 636,184 Yemen
  • 619,597 Bahrain
  • 611,836 Tanzania
  • 594,511 Zimbabwe
  • 589,937 Cambodia
  • 585,994 Kyrgyzstan
  • 554,587 Mozambique
  • 538,538 New Caledonia
  • 481,521 Libya
  • 432,667 Mongolia
  • 375,997 Ethiopia
  • 357,612 Barbados
  • 334,431 French Guiana
  • 330,018 French Polynesia
  • 327,635 Brunei Darussalam
  • 317,571 Zambia
  • 308,987 Namibia
  • 304,119 Guyana
  • 301,369 Haiti
  • 262,961 Fiji
  • 215,222 Afghanistan
  • 214,721 Botswana
  • 211,940 Belize
  • 207,867 Bahamas
  • 198,943 Gabon
  • 197,530 Congo, Democratic Republic
  • 188,290 Maldives
  • 168,730 Mayotte
  • 155,360 Cape Verde
  • 152,655 Suriname
  • 134,174 Guam
  • 117,178 Andorra
  • 116,511 Saint Lucia
  • 113,642 Benin
  • 108,670 Antigua And Barbuda
  • 102,212 Rwanda
  • 100,305 Saint Vincent And Grenadines
  • 94,601 Burkina Faso
  • 94,315 Tajikistan
  • 93,613 Laos
  • 87,684 Aruba
  • 80,348 Grenada
  • 78,429 Djibouti
  • 71,746 Guinea
  • 70,738 Congo
  • 69,211 Togo
  • 68,247 Malawi
  • 68,109 Mauritania
  • 61,204 Monaco
  • 59,836 Saint Kitts And Nevis
  • 58,543 Bhutan
  • 56,271 Cayman Islands
  • 55,706 Seychelles
  • 54,654 Mali
  • 50,757 Faroe Islands
  • 47,285 Virgin Islands, U.S.
  • 36,876 Gibraltar
  • 30,122 Niger
  • 15,023 Equatorial Guinea
Site explorer

478 million keywords

  • 136,030,723 United States
  • 22,703,062 France
  • 20,406,201 United Kingdom
  • 20,155,285 Germany
  • 20,030,974 Japan
  • 17,817,856 India
  • 16,786,570 Brazil
  • 15,827,190 Canada
  • 15,205,506 Italy
  • 14,512,181 Australia
  • 12,475,537 Russian Federation
  • 11,484,843 Spain
  • 11,273,990 Poland
  • 11,185,322 Turkey
  • 11,180,788 Mexico
  • 8,059,843 Indonesia
  • 6,335,668 Netherlands
  • 6,274,637 Argentina
  • 5,681,055 Viet Nam
  • 5,394,659 Colombia
  • 4,976,400 Ukraine
  • 3,503,517 Taiwan
  • 3,346,944 Philippines
  • 3,287,994 Sweden
  • 2,954,872 Chile
  • 2,571,747 Venezuela
  • 2,563,571 Thailand
  • 2,495,755 Peru
  • 2,406,740 Greece
  • 2,378,335 Belgium
  • 2,221,304 Austria
  • 2,202,418 Hungary
  • 2,163,198 Pakistan
  • 2,154,672 Egypt
  • 2,123,658 Malaysia
  • 2,085,764 Denmark
  • 2,047,286 Czech Republic
  • 2,009,046 Romania
  • 1,968,946 Israel
  • 1,953,915 Korea
  • 1,823,964 Algeria
  • 1,754,070 Finland
  • 1,636,525 Saudi Arabia
  • 1,624,414 South Africa
  • 1,582,411 Portugal
  • 1,568,930 Ecuador
  • 1,444,628 Morocco
  • 1,384,941 Switzerland
  • 1,327,691 Hong Kong
  • 1,288,763 Norway
  • 1,275,503 Singapore
  • 1,108,688 Bulgaria
  • 1,063,413 New Zealand
  • 1,006,928 Serbia
  • 977,774 Slovakia
  • 838,269 Kazakhstan
  • 834,507 Ireland
  • 804,315 Croatia
  • 730,004 Belarus
  • 682,124 United Arab Emirates
  • 592,083 Tunisia
  • 573,253 Uruguay
  • 567,170 Dominican Republic
  • 557,831 Bangladesh
  • 555,021 Bolivia
  • 546,173 Sri Lanka
  • 526,920 Lithuania
  • 475,291 Costa Rica
  • 460,386 Slovenia
  • 436,262 Guatemala
  • 400,122 Nigeria
  • 396,607 Iraq
  • 357,404 Azerbaijan
  • 353,515 Bosnia & Herzegovina
  • 312,207 Latvia
  • 293,593 Panama
  • 285,069 El Salvador
  • 276,211 Estonia
  • 264,719 Kenya
  • 259,074 Moldova
  • 252,862 Paraguay
  • 241,833 Jordan
  • 229,875 Armenia
  • 229,641 Puerto Rico
  • 219,550 Honduras
  • 218,149 Georgia
  • 148,239 Palestinian Territory
  • 146,884 Qatar
  • 145,087 Ghana
  • 139,768 Macedonia
  • 136,149 Nicaragua
  • 131,746 Jamaica
  • 131,482 Trinidad And Tobago
  • 129,678 Lebanon
  • 123,381 Kuwait
  • 116,964 Mauritius
  • 113,575 Oman
  • 111,784 Albania
  • 105,783 Nepal
  • 93,552 Cote D'Ivoire
  • 91,555 Cyprus
  • 90,818 Tanzania
  • 86,392 Luxembourg
  • 77,368 Malta
  • 76,075 Cameroon
  • 75,753 Kyrgyzstan
  • 75,463 Senegal
  • 72,388 Cambodia
  • 67,878 Bahrain
  • 63,389 Angola
  • 62,583 Libya
  • 60,586 Iceland
  • 57,701 Mozambique
  • 54,185 Montenegro
  • 53,883 Guadeloupe
  • 52,352 Zimbabwe
  • 50,429 Mongolia
  • 49,239 Madagascar
  • 46,590 Ethiopia
  • 29,997 Haiti
  • 29,755 Zambia
  • 26,892 Namibia
  • 26,788 Brunei Darussalam
  • 26,183 Afghanistan
  • 22,586 Martinique
  • 19,978 Bahamas
  • 19,685 Guyana
  • 19,555 Congo, Democratic Republic
  • 18,875 Maldives
  • 18,705 Fiji
  • 17,753 Laos
  • 17,499 Tajikistan
  • 16,683 Suriname
  • 15,976 New Caledonia
  • 15,707 Botswana
  • 15,378 Gabon
  • 12,850 Burkina Faso
  • 12,637 Belize
  • 11,872 Rwanda
  • 11,046 Benin
  • 10,346 Congo
  • 10,275 Cape Verde
  • 9,745 Mali
  • 8,945 French Polynesia
  • 8,234 Saint Vincent And Grenadines
  • 7,728 Togo
  • 7,231 Andorra
  • 7,007 Bhutan
  • 6,076 Malawi
  • 6,036 Antigua And Barbuda
  • 5,975 Niger
  • 5,388 Djibouti
  • 5,203 Virgin Islands, U.S.
  • 3,967 Barbados
  • 3,778 Mauritania
  • 3,690 Seychelles
  • 3,612 Gibraltar
  • 3,148 Guam
  • 2,931 Monaco
  • 2,175 Saint Kitts And Nevis
  • 1,533 Guinea
  • 1,517 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