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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
  • 20,921,380 Germany
  • 20,114,563 United Kingdom
  • 19,946,166 France
  • 17,367,939 Brazil
  • 17,298,773 Canada
  • 16,337,697 Australia
  • 16,248,310 India
  • 13,633,336 Italy
  • 12,273,123 Russian Federation
  • 10,462,451 Spain
  • 10,118,419 Turkey
  • 9,377,569 Poland
  • 8,973,277 Mexico
  • 8,270,064 Indonesia
  • 5,925,092 Netherlands
  • 5,132,368 Ukraine
  • 4,850,234 Viet Nam
  • 4,736,107 Argentina
  • 3,993,617 Thailand
  • 3,749,839 Colombia
  • 3,491,020 Sweden
  • 2,979,755 Taiwan
  • 2,897,856 Philippines
  • 2,710,742 Chile
  • 2,401,911 Venezuela
  • 2,318,685 Austria
  • 2,184,671 Denmark
  • 2,128,661 Czech Republic
  • 1,980,406 Peru
  • 1,894,993 Israel
  • 1,889,006 Greece
  • 1,808,076 Belgium
  • 1,747,344 Egypt
  • 1,673,207 Hungary
  • 1,579,467 Pakistan
  • 1,555,506 Singapore
  • 1,526,903 Malaysia
  • 1,517,617 Norway
  • 1,456,714 Romania
  • 1,426,506 Hong Kong
  • 1,395,415 Korea
  • 1,340,778 Finland
  • 1,214,587 Portugal
  • 1,181,995 New Zealand
  • 1,181,312 South Africa
  • 1,140,800 Algeria
  • 1,109,156 Ecuador
  • 1,086,091 Saudi Arabia
  • 1,018,254 Switzerland
  • 944,619 Morocco
  • 826,254 Bulgaria
  • 754,503 Serbia
  • 741,934 Slovakia
  • 656,699 Ireland
  • 600,591 Croatia
  • 541,107 Kazakhstan
  • 518,443 Belarus
  • 504,045 United Arab Emirates
  • 411,879 Uruguay
  • 397,316 Bangladesh
  • 394,664 Bolivia
  • 393,672 Dominican Republic
  • 390,837 Tunisia
  • 390,140 Sri Lanka
  • 384,134 Lithuania
  • 348,887 Costa Rica
  • 335,819 Slovenia
  • 318,087 Guatemala
  • 313,387 Nigeria
  • 252,008 Iraq
  • 242,354 Azerbaijan
  • 237,596 Bosnia & Herzegovina
  • 226,118 Latvia
  • 224,764 Panama
  • 218,551 Kenya
  • 214,668 Estonia
  • 205,520 El Salvador
  • 186,366 Paraguay
  • 179,888 Jordan
  • 175,352 Moldova
  • 166,105 Puerto Rico
  • 159,264 Honduras
  • 155,755 Armenia
  • 150,955 Georgia
  • 116,323 Ghana
  • 114,554 Trinidad And Tobago
  • 114,298 Jamaica
  • 106,026 Palestinian Territory
  • 103,063 Qatar
  • 101,471 Macedonia
  • 100,279 Lebanon
  • 95,275 Kuwait
  • 93,906 Mauritius
  • 93,778 Nicaragua
  • 89,381 Nepal
  • 81,758 Albania
  • 76,419 Cyprus
  • 74,562 Oman
  • 70,555 Tanzania
  • 70,523 Cote D'Ivoire
  • 63,052 Malta
  • 56,888 Luxembourg
  • 56,342 Senegal
  • 56,130 Cameroon
  • 56,129 Kyrgyzstan
  • 53,989 Cambodia
  • 48,070 Angola
  • 47,440 Bahrain
  • 47,220 Libya
  • 46,381 Iceland
  • 43,820 Guadeloupe
  • 40,988 Zimbabwe
  • 39,915 Mozambique
  • 39,135 Montenegro
  • 37,712 Madagascar
  • 37,712 Mongolia
  • 34,703 Ethiopia
  • 24,057 Namibia
  • 23,923 Haiti
  • 22,775 Zambia
  • 20,096 Brunei Darussalam
  • 18,092 Fiji
  • 17,491 Afghanistan
  • 16,217 Bahamas
  • 15,993 Laos
  • 15,460 Guyana
  • 15,202 Suriname
  • 14,076 Congo, Democratic Republic
  • 13,838 Maldives
  • 13,698 Botswana
  • 13,036 Tajikistan
  • 13,021 Gabon
  • 11,402 Rwanda
  • 10,861 Belize
  • 10,098 Burkina Faso
  • 9,148 Congo
  • 8,853 Benin
  • 8,815 Cape Verde
  • 8,017 Mali
  • 7,193 Togo
  • 6,612 Saint Vincent And Grenadines
  • 6,336 Bhutan
  • 6,087 Andorra
  • 5,623 Antigua And Barbuda
  • 5,450 Niger
  • 5,170 Malawi
  • 4,431 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