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
    846 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (4.6 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (429 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

4.6 billion keywords

  • 1,724,219,557 United States
  • 359,927,258 Brazil
  • 238,132,857 France
  • 233,236,215 United Kingdom
  • 124,001,389 Poland
  • 120,374,116 Spain
  • 120,099,310 Germany
  • 103,455,538 Italy
  • 98,765,459 Russian Federation
  • 93,385,785 Canada
  • 92,009,615 Mexico
  • 78,252,189 Argentina
  • 72,981,558 India
  • 71,930,325 Colombia
  • 70,155,357 Japan
  • 69,183,332 Australia
  • 50,674,396 Ukraine
  • 39,821,037 Indonesia
  • 38,959,925 Chile
  • 37,807,299 Turkey
  • 35,153,940 Venezuela
  • 30,913,948 Czech Republic
  • 30,553,261 Philippines
  • 27,816,009 Taiwan
  • 27,696,644 Peru
  • 27,532,269 Belgium
  • 26,954,913 Netherlands
  • 24,706,807 Hungary
  • 24,031,894 Greece
  • 22,998,416 Ecuador
  • 20,341,861 Romania
  • 20,110,894 Finland
  • 20,102,942 Vietnam
  • 19,533,699 Pakistan
  • 17,782,023 Norway
  • 17,687,683 Algeria
  • 17,580,007 Egypt
  • 17,154,538 Portugal
  • 16,314,839 Malaysia
  • 16,215,444 Sweden
  • 15,966,379 Morocco
  • 15,006,082 New Zealand
  • 13,327,613 South Korea
  • 13,166,316 Austria
  • 13,061,684 South Africa
  • 12,116,635 Serbia
  • 12,001,220 Switzerland
  • 11,715,738 Bulgaria
  • 11,417,954 Slovakia
  • 10,710,098 Saudi Arabia
  • 10,217,769 Denmark
  • 9,232,018 Croatia
  • 9,115,265 Belarus
  • 8,713,879 Bolivia
  • 8,555,938 Uruguay
  • 8,153,149 Tunisia
  • 7,814,617 Kazakhstan
  • 7,640,729 Hong Kong
  • 7,486,467 Israel
  • 7,304,781 Dominican Republic
  • 7,291,591 Ireland
  • 7,188,384 Thailand
  • 6,631,911 Costa Rica
  • 6,553,365 Singapore
  • 5,873,031 Lithuania
  • 5,488,771 Slovenia
  • 5,087,147 Sri Lanka
  • 4,910,134 Guatemala
  • 4,726,127 Bangladesh
  • 4,388,298 United Arab Emirates
  • 4,284,586 Bosnia & Herzegovina
  • 4,036,938 Latvia
  • 4,005,950 El Salvador
  • 3,849,556 Panama
  • 3,772,888 Paraguay
  • 3,709,298 Moldova
  • 3,540,673 Estonia
  • 3,493,302 Nigeria
  • 2,903,771 Honduras
  • 2,717,388 Azerbaijan
  • 2,427,871 Armenia
  • 2,281,904 Puerto Rico
  • 1,822,662 Kenya
  • 1,792,852 Jordan
  • 1,778,381 Iraq
  • 1,733,260 Nicaragua
  • 1,705,232 Georgia
  • 1,698,597 Mauritius
  • 1,697,012 Macedonia
  • 1,667,596 Trinidad and Tobago
  • 1,646,746 Reunion
  • 1,496,424 Palestinian Territory
  • 1,381,780 Jamaica
  • 1,220,743 Ghana
  • 1,053,186 Albania
  • 1,012,097 Malta
  • 1,004,217 Qatar
  • 892,140 Madagascar
  • 892,004 Cyprus
  • 886,922 Lebanon
  • 848,954 Luxembourg
  • 846,557 Cote D"Ivoire
  • 833,644 Nepal
  • 817,472 Oman
  • 817,181 Kuwait
  • 808,963 Cameroon
  • 715,300 Senegal
  • 688,044 Montenegro
  • 682,351 Angola
  • 657,390 Guadeloupe
  • 656,508 Iceland
  • 596,850 Martinique
  • 579,384 Yemen
  • 569,166 Bahrain
  • 561,536 Tanzania
  • 538,453 Kyrgyzstan
  • 529,820 Zimbabwe
  • 525,201 Cambodia
  • 506,309 Mozambique
  • 483,126 New Caledonia
  • 424,957 Libya
  • 394,107 Mongolia
  • 336,261 Ethiopia
  • 320,446 Barbados
  • 303,372 French Guiana
  • 291,599 French Polynesia
  • 289,056 Zambia
  • 286,577 Brunei
  • 278,253 Namibia
  • 275,570 Guyana
  • 273,928 Haiti
  • 230,709 Fiji
  • 195,204 Afghanistan
  • 191,254 Botswana
  • 190,481 Belize
  • 186,950 Bahamas
  • 180,880 Gabon
  • 178,746 Congo
  • 168,442 Maldives
  • 151,562 Mayotte
  • 142,869 Cape Verde
  • 138,546 Suriname
  • 118,484 Guam
  • 105,573 Andorra
  • 102,409 Saint Lucia
  • 101,614 Benin
  • 97,809 Antigua
  • 91,107 Rwanda
  • 89,544 Saint Vincent
  • 86,602 Burkina Faso
  • 85,837 Tajikistan
  • 83,823 Laos
  • 78,553 Aruba
  • 72,526 Djibouti
  • 71,341 Grenada
  • 67,153 Guinea
  • 64,665 Congo
  • 63,407 Mauritania
  • 62,099 Togo
  • 60,255 Malawi
  • 54,600 Monaco
  • 53,689 Saint Kitts and Nevis
  • 52,411 Bhutan
  • 49,831 Mali
  • 49,566 Seychelles
  • 49,220 Cayman Islands
  • 45,079 Faroe Islands
  • 44,082 Virgin Islands, U.S.
  • 32,389 Gibraltar
  • 27,834 Niger
  • 13,652 Equatorial Guinea
Site explorer

429 million keywords

  • 117,877,203 United States
  • 21,086,651 France
  • 19,890,615 United Kingdom
  • 18,052,548 Japan
  • 16,549,442 Germany
  • 16,387,427 Brazil
  • 14,007,892 Australia
  • 13,022,699 Italy
  • 12,516,575 India
  • 12,366,583 Canada
  • 12,042,747 Russian Federation
  • 11,068,189 Spain
  • 10,868,795 Poland
  • 9,314,253 Turkey
  • 8,796,356 Mexico
  • 7,573,065 Indonesia
  • 5,898,413 Argentina
  • 5,533,229 Vietnam
  • 5,092,413 Netherlands
  • 4,796,035 Ukraine
  • 3,395,611 Sweden
  • 3,186,645 Taiwan
  • 3,099,116 Philippines
  • 2,773,708 Chile
  • 2,488,933 Venezuela
  • 2,338,603 Peru
  • 2,325,952 Thailand
  • 2,279,864 Israel
  • 2,229,719 Greece
  • 2,228,326 Belgium
  • 2,159,346 Austria
  • 2,055,953 Hungary
  • 2,043,177 Pakistan
  • 2,027,352 Czech Republic
  • 2,011,273 Egypt
  • 1,998,989 Denmark
  • 1,954,446 Malaysia
  • 1,880,951 Romania
  • 1,855,285 Norway
  • 1,795,926 South Korea
  • 1,731,895 Algeria
  • 1,641,039 Finland
  • 1,530,065 Saudi Arabia
  • 1,526,370 South Africa
  • 1,486,112 Portugal
  • 1,479,109 Ecuador
  • 1,360,358 Morocco
  • 1,291,302 Switzerland
  • 1,255,302 Hong Kong
  • 1,215,095 Singapore
  • 1,046,063 Bulgaria
  • 1,007,470 New Zealand
  • 942,675 Serbia
  • 918,298 Slovakia
  • 791,232 Kazakhstan
  • 776,072 Ireland
  • 75,2526 Croatia
  • 686,370 Belarus
  • 639,560 United Arab Emirates
  • 562,674 Tunisia
  • 548,649 Uruguay
  • 534,813 Dominican Republic
  • 520,346 Bolivia
  • 516,966 Bangladesh
  • 507,627 Sri Lanka
  • 496,420 Lithuania
  • 446,790 Costa Rica
  • 433,311 Slovenia
  • 406,563 Guatemala
  • 372,561 Iraq
  • 367,152 Nigeria
  • 339,128 Azerbaijan
  • 334,419 Bosnia & Herzegovina
  • 292,945 Latvia
  • 273,496 Panama
  • 267,864 El Salvador
  • 256,783 Estonia
  • 244,866 Kenya
  • 243,737 Moldova
  • 237,415 Paraguay
  • 223,894 Jordan
  • 221,198 Puerto Rico
  • 218,050 Armenia
  • 205,946 Georgia
  • 205,188 Honduras
  • 140,648 Palestinian Territory
  • 136,720 Qatar
  • 13,4718 Ghana
  • 131,215 Macedonia
  • 128,239 Nicaragua
  • 122,588 Trinidad and Tobago
  • 122,417 Jamaica
  • 120,428 Lebanon
  • 115,832 Kuwait
  • 107,935 Mauritius
  • 106,694 Oman
  • 105,342 Albania
  • 101,815 Luxembourg
  • 97,159 Nepal
  • 87,514 Cote D"Ivoire
  • 84,632 Tanzania
  • 84,597 Cyprus
  • 72,946 Montenegro
  • 72,057 Malta
  • 70,850 Kyrgyzstan
  • 70,383 Senegal
  • 69,444 Cameroon
  • 66,446 Cambodia
  • 64,128 Bahrain
  • 59,172 Angola
  • 56,272 Libya
  • 56,254 Iceland
  • 53,613 Mozambique
  • 50,205 Guadeloupe
  • 49,048 Zimbabwe
  • 47,136 Mongolia
  • 45,965 Madagascar
  • 42,975 Ethiopia
  • 28,527 Maldives
  • 28,244 Zambia
  • 27,820 Haiti
  • 25,017 Namibia
  • 24,414 Afghanistan
  • 24,391 Brunei
  • 22,586 Martinique
  • 18,257 Bahamas
  • 18222 Congo
  • 18,127 Guyana
  • 16822 Fiji
  • 16,363 Tajikistan
  • 16,269 Laos
  • 15,976 New Caledonia
  • 1,5735 Suriname
  • 14,447 Gabon
  • 14,315 Botswana
  • 12,087 Burkina Faso
  • 11653 Belize
  • 11,065 Rwanda
  • 10,273 Benin
  • 9864 Congo
  • 9,695 Cape Verde
  • 9,055 Mali
  • 8,945 French Polynesia
  • 7,977 Saint Vincent
  • 7,364 Togo
  • 7,016 Bhutan
  • 6,840 Andorra
  • 5,790 Niger
  • 5,649 Antigua
  • 5,559 Malawi
  • 5,156 Djibouti
  • 5,119 Virgin Islands, U.S.
  • 3,967 Barbados
  • 3,778 Mauritania
  • 3,481 Gibraltar
  • 3,480 Seychelles
  • 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

Backlink index

Ahrefs boasts the world's largest index of live backlinks that is updated with fresh data every 15-30 minutes. We use this backlink data to calculate our proprietary metrics: Ahrefs Rank, Domain Rating & URL Rating.

Domains (POST-VETTING)
Pages in index
Internal backlinks
External backlinks

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

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