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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

  • 149,946,368 United States
  • 24,892,865 Japan
  • 20,959,173 Germany
  • 20,026,370 United Kingdom
  • 19,926,435 France
  • 17,411,929 Brazil
  • 17,285,393 Canada
  • 16,326,632 Australia
  • 16,231,608 India
  • 13,620,759 Italy
  • 12,276,690 Russian Federation
  • 10,405,892 Spain
  • 10,127,980 Turkey
  • 9,360,003 Poland
  • 8,941,873 Mexico
  • 8,250,190 Indonesia
  • 5,922,161 Netherlands
  • 5,104,509 Ukraine
  • 4,830,005 Viet Nam
  • 4,732,651 Argentina
  • 3,970,908 Thailand
  • 3,743,678 Colombia
  • 3,491,723 Sweden
  • 2,950,503 Taiwan
  • 2,896,676 Philippines
  • 2,713,091 Chile
  • 2,395,413 Venezuela
  • 2,323,181 Austria
  • 2,180,452 Denmark
  • 2,130,144 Czech Republic
  • 1,972,468 Peru
  • 1,890,592 Israel
  • 1,877,026 Greece
  • 1,808,201 Belgium
  • 1,731,949 Egypt
  • 1,668,483 Hungary
  • 1,565,509 Pakistan
  • 1,551,152 Singapore
  • 1,517,483 Malaysia
  • 1,514,985 Norway
  • 1,446,484 Romania
  • 1,422,588 Hong Kong
  • 1,380,174 Korea
  • 1,338,415 Finland
  • 1,207,215 Portugal
  • 1,178,730 New Zealand
  • 1,171,761 South Africa
  • 1,138,616 Algeria
  • 1,104,067 Ecuador
  • 1,087,526 Saudi Arabia
  • 1,012,646 Switzerland
  • 942,597 Morocco
  • 820,959 Bulgaria
  • 749,159 Serbia
  • 739,485 Slovakia
  • 654,339 Ireland
  • 599,034 Croatia
  • 537,530 Kazakhstan
  • 515,078 Belarus
  • 507,597 United Arab Emirates
  • 411,240 Uruguay
  • 393,323 Bolivia
  • 392,732 Bangladesh
  • 392,630 Dominican Republic
  • 388,057 Tunisia
  • 386,763 Sri Lanka
  • 384,474 Lithuania
  • 348,215 Costa Rica
  • 335,871 Slovenia
  • 316,874 Guatemala
  • 312,420 Nigeria
  • 251,645 Iraq
  • 239,952 Azerbaijan
  • 236,080 Bosnia & Herzegovina
  • 225,620 Latvia
  • 224,078 Panama
  • 215,516 Kenya
  • 213,855 Estonia
  • 205,205 El Salvador
  • 185,914 Paraguay
  • 177,521 Jordan
  • 174,080 Moldova
  • 165,150 Puerto Rico
  • 159,125 Honduras
  • 155,014 Armenia
  • 150,468 Georgia
  • 114,897 Ghana
  • 113,635 Trinidad And Tobago
  • 113,415 Jamaica
  • 105,166 Palestinian Territory
  • 102,400 Qatar
  • 101,460 Macedonia
  • 100,705 Lebanon
  • 94,664 Kuwait
  • 93,866 Nicaragua
  • 93,188 Mauritius
  • 88,211 Nepal
  • 81,703 Albania
  • 75,456 Cyprus
  • 73,726 Oman
  • 70,514 Tanzania
  • 69,677 Cote D'Ivoire
  • 62,742 Malta
  • 56,911 Luxembourg
  • 56,078 Cameroon
  • 55,730 Senegal
  • 55,383 Kyrgyzstan
  • 53,598 Cambodia
  • 47,624 Angola
  • 47,211 Bahrain
  • 46,777 Libya
  • 46,063 Iceland
  • 43,769 Guadeloupe
  • 40,520 Zimbabwe
  • 39,810 Mozambique
  • 39,081 Montenegro
  • 37,411 Mongolia
  • 37,398 Madagascar
  • 34,013 Ethiopia
  • 23,861 Namibia
  • 23,720 Haiti
  • 22,609 Zambia
  • 20,022 Brunei Darussalam
  • 17,837 Fiji
  • 17,569 Afghanistan
  • 16,229 Bahamas
  • 15,799 Laos
  • 15,386 Guyana
  • 15,087 Suriname
  • 14,095 Congo, Democratic Republic
  • 13,695 Maldives
  • 13,587 Botswana
  • 12,952 Gabon
  • 12,874 Tajikistan
  • 11,287 Rwanda
  • 10,794 Belize
  • 10,043 Burkina Faso
  • 9,099 Congo
  • 8,833 Benin
  • 8,805 Cape Verde
  • 7,908 Mali
  • 7,095 Togo
  • 6,574 Saint Vincent And Grenadines
  • 6,301 Bhutan
  • 6,057 Andorra
  • 5,604 Antigua And Barbuda
  • 5,427 Niger
  • 5,095 Malawi
  • 4,411 Djibouti
  • 3,584 Virgin Islands, U.S.
  • 3,343 Seychelles
  • 3,013 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