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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 (7.2 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (475 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

7.2 billion keywords

  • 2,960,862,978 United States
  • 501,805,872 Brazil
  • 334,049,313 France
  • 311,363,776 United Kingdom
  • 179,805,447 Germany
  • 174,867,465 Spain
  • 170,810,193 Poland
  • 153,801,693 Italy
  • 134,861,405 Russian Federation
  • 132,777,232 Mexico
  • 131,141,935 Canada
  • 114,850,482 Argentina
  • 108,094,382 Japan
  • 107,222,570 India
  • 99,818,769 Colombia
  • 95,114,173 Australia
  • 73,942,808 Ukraine
  • 57,654,674 Indonesia
  • 55,989,089 Chile
  • 53,947,036 Turkey
  • 47,941,444 Venezuela
  • 47,019,237 Czech Republic
  • 45,913,498 Philippines
  • 44,353,701 Netherlands
  • 42,725,358 Taiwan
  • 41,525,925 Belgium
  • 40,047,167 Peru
  • 35,631,623 Hungary
  • 35,357,313 Greece
  • 32,673,082 Ecuador
  • 29,070,145 Romania
  • 28,964,863 Finland
  • 26,615,901 Viet Nam
  • 26,438,154 Pakistan
  • 25,859,338 Portugal
  • 25,359,492 Sweden
  • 24,961,181 Egypt
  • 24,666,064 Malaysia
  • 23,084,080 Algeria
  • 22,303,964 Norway
  • 21,808,479 Morocco
  • 20,923,519 South Africa
  • 20,528,483 Thailand
  • 20,139,458 Austria
  • 19,891,321 New Zealand
  • 19,765,580 Korea
  • 18,646,976 Switzerland
  • 17,570,037 Serbia
  • 16,684,796 Denmark
  • 16,675,286 Slovakia
  • 16,414,362 Bulgaria
  • 15,019,808 Saudi Arabia
  • 13,519,173 Croatia
  • 13,046,581 Bolivia
  • 13,019,674 Hong Kong
  • 12,967,275 Belarus
  • 12,923,736 Israel
  • 12,514,127 Uruguay
  • 11,903,466 Ireland
  • 11,340,938 Singapore
  • 11,136,875 Tunisia
  • 10,787,703 Kazakhstan
  • 10,431,283 Dominican Republic
  • 9,800,378 Costa Rica
  • 8,462,002 Lithuania
  • 7,965,488 Slovenia
  • 7,519,932 Guatemala
  • 7,388,814 Sri Lanka
  • 7,260,922 Bangladesh
  • 6,635,923 United Arab Emirates
  • 6,069,518 Panama
  • 6,050,942 Bosnia & Herzegovina
  • 5,941,213 El Salvador
  • 5,834,890 Latvia
  • 5,667,578 Nigeria
  • 5,574,874 Paraguay
  • 5,392,677 Estonia
  • 5,054,423 Moldova
  • 4,436,196 Honduras
  • 3,609,607 Azerbaijan
  • 3,257,915 Kenya
  • 3,206,079 Armenia
  • 3,142,200 Puerto Rico
  • 2,898,323 Trinidad And Tobago
  • 2,726,667 Jordan
  • 2,694,264 Mauritius
  • 2,545,588 Reunion
  • 2,485,255 Nicaragua
  • 2,474,564 Macedonia
  • 2,404,490 Jamaica
  • 2,396,158 Georgia
  • 2,281,742 Iraq
  • 1,980,112 Palestinian Territory
  • 1,953,760 Ghana
  • 1,614,343 Malta
  • 1,565,917 Albania
  • 1,519,704 Qatar
  • 1,512,511 Cyprus
  • 1,505,692 Lebanon
  • 1,460,880 Nepal
  • 1,427,175 Zimbabwe
  • 1,356,171 Madagascar
  • 1,333,849 Luxembourg
  • 1,305,632 Cote D'Ivoire
  • 1,284,011 Cameroon
  • 1,283,123 Kuwait
  • 1,214,123 Oman
  • 1,075,479 Senegal
  • 1,040,883 Angola
  • 1,019,307 Iceland
  • 999,423 Montenegro
  • 987,839 Guadeloupe
  • 926,521 Martinique
  • 877,080 Yemen
  • 872,657 Cambodia
  • 854,018 Tanzania
  • 853,146 Bahrain
  • 792,544 Kyrgyzstan
  • 737,188 Mozambique
  • 715,159 New Caledonia
  • 708,195 Libya
  • 600,154 Mongolia
  • 547,341 Ethiopia
  • 486,428 Zambia
  • 466,265 Namibia
  • 465,703 Brunei Darussalam
  • 456,481 French Polynesia
  • 452,180 Haiti
  • 449,885 French Guiana
  • 433,834 Fiji
  • 424,283 Guyana
  • 328,752 Belize
  • 327,591 Botswana
  • 311,427 Bahamas
  • 290,081 Gabon
  • 281,014 Afghanistan
  • 266,377 Congo, Democratic Republic
  • 255,864 Maldives
  • 231,153 Mayotte
  • 226,988 Suriname
  • 222,367 Cape Verde
  • 212,723 Guam
  • 179,801 Saint Lucia
  • 167,888 Antigua And Barbuda
  • 163,605 Benin
  • 163,368 Rwanda
  • 161,821 Andorra
  • 154,997 Laos
  • 140,589 Saint Vincent And Grenadines
  • 133,372 Burkina Faso
  • 131,892 Aruba
  • 120,067 Tajikistan
  • 116,359 Grenada
  • 102,793 Togo
  • 101,368 Djibouti
  • 100,333 Malawi
  • 99,324 Congo
  • 89,925 Mauritania
  • 86,194 Monaco
  • 85,324 Guinea
  • 84,281 Saint Kitts And Nevis
  • 81,482 Bhutan
  • 81,373 Cayman Islands
  • 81,051 Seychelles
  • 76,685 Mali
  • 70,673 Faroe Islands
  • 63,125 Virgin Islands, U.S.
  • 53,983 Gibraltar
  • 42,163 Niger
  • 21,028 Equatorial Guinea
Site explorer

475 million keywords

  • 149,946,138 United States
  • 25,548,238 Japan
  • 20,897,411 Germany
  • 20,026,367 United Kingdom
  • 19,803,446 France
  • 18,267,540 India
  • 17,340,757 Brazil
  • 17,285,143 Canada
  • 16,321,066 Australia
  • 13,620,555 Italy
  • 12,276,630 Russian Federation
  • 11,151,814 Turkey
  • 10,405,892 Spain
  • 9,360,003 Poland
  • 8,941,866 Mexico
  • 8,250,181 Indonesia
  • 5,922,161 Netherlands
  • 5,104,500 Ukraine
  • 4,830,004 Viet Nam
  • 4,732,645 Argentina
  • 3,907,395 Thailand
  • 3,743,672 Colombia
  • 3,491,719 Sweden
  • 2,935,142 Taiwan
  • 2,883,287 Philippines
  • 2,698,604 Chile
  • 2,385,858 Venezuela
  • 2,323,181 Austria
  • 2,180,452 Denmark
  • 2,130,144 Czech Republic
  • 1,959,793 Peru
  • 1,890,592 Israel
  • 1,863,878 Greece
  • 1,806,667 Belgium
  • 1,712,038 Egypt
  • 1,668,483 Hungary
  • 1,551,881 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
  • 1,178,715 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
  • 815,806 Bulgaria
  • 749,159 Serbia
  • 739,485 Slovakia
  • 654,276 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
  • 316,873 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