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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
    790 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (5.3 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (502 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

5.3 billion keywords

  • 1,983,654,312 United States
  • 401,299,524 Brazil
  • 265,802,338 France
  • 245,990,024 United Kingdom
  • 137,270,656 Poland
  • 135,331,399 Germany
  • 134,338,804 Spain
  • 116,786,552 Italy
  • 109,648,457 Russian Federation
  • 104,033,707 Mexico
  • 101,026,401 Canada
  • 87,948,728 Argentina
  • 82,883,228 India
  • 80,872,960 Colombia
  • 78,577,568 Japan
  • 74,195,236 Australia
  • 57,080,891 Ukraine
  • 45,682,248 Indonesia
  • 43,993,570 Chile
  • 42,215,665 Turkey
  • 38,900,619 Venezuela
  • 35,143,698 Czech Republic
  • 35,012,440 Philippines
  • 32,680,227 Taiwan
  • 31,359,706 Belgium
  • 31,329,597 Peru
  • 31,025,761 Netherlands
  • 27,726,382 Hungary
  • 26,991,758 Greece
  • 25,815,921 Ecuador
  • 22,738,324 Romania
  • 22,681,005 Finland
  • 22,006,344 Viet Nam
  • 21,529,959 Pakistan
  • 19,472,954 Egypt
  • 19,370,611 Portugal
  • 19,282,691 Algeria
  • 18,764,429 Norway
  • 18,730,991 Malaysia
  • 18,575,371 Sweden
  • 17,559,127 Morocco
  • 16,023,203 New Zealand
  • 15,229,679 Korea
  • 14,909,880 Austria
  • 14,900,876 South Africa
  • 13,835,114 Switzerland
  • 13,567,781 Serbia
  • 13,039,039 Bulgaria
  • 12,826,286 Slovakia
  • 11,899,802 Saudi Arabia
  • 11,844,951 Denmark
  • 10,380,984 Croatia
  • 10,245,478 Belarus
  • 9,924,589 Bolivia
  • 9,683,209 Uruguay
  • 9,009,330 Tunisia
  • 8,920,895 Hong Kong
  • 8,705,175 Kazakhstan
  • 8,530,326 Israel
  • 8,351,858 Ireland
  • 8,236,502 Thailand
  • 8,199,371 Dominican Republic
  • 7,661,534 Singapore
  • 7,470,309 Costa Rica
  • 6,597,049 Lithuania
  • 6,183,393 Slovenia
  • 5,714,525 Sri Lanka
  • 5,538,709 Guatemala
  • 5,386,364 Bangladesh
  • 4,943,957 United Arab Emirates
  • 4,775,081 Bosnia & Herzegovina
  • 4,548,611 Latvia
  • 4,534,975 El Salvador
  • 4,407,776 Panama
  • 4,256,233 Paraguay
  • 4,107,819 Moldova
  • 4,056,610 Estonia
  • 4,010,389 Nigeria
  • 3,308,491 Honduras
  • 2,976,345 Azerbaijan
  • 2,663,336 Armenia
  • 2,431,035 Puerto Rico
  • 2,108,697 Kenya
  • 2,004,763 Jordan
  • 1,968,155 Iraq
  • 1,960,795 Nicaragua
  • 1,924,637 Mauritius
  • 1,919,273 Reunion
  • 1,903,508 Macedonia
  • 1,897,378 Trinidad And Tobago
  • 1,891,140 Georgia
  • 1,645,587 Palestinian Territory
  • 1,582,759 Jamaica
  • 1,388,021 Ghana
  • 1,181,780 Albania
  • 1,160,258 Malta
  • 1,129,548 Qatar
  • 1,023,208 Cyprus
  • 1,018,183 Madagascar
  • 1,010,988 Lebanon
  • 972,543 Luxembourg
  • 965,541 Nepal
  • 957,316 Cote D'Ivoire
  • 940,165 Cameroon
  • 915,551 Kuwait
  • 912,228 Oman
  • 795,994 Senegal
  • 779,423 Montenegro
  • 771,673 Angola
  • 761,888 Iceland
  • 746,909 Guadeloupe
  • 692,331 Martinique
  • 654,620 Yemen
  • 636,558 Bahrain
  • 627,401 Tanzania
  • 615,819 Zimbabwe
  • 614,060 Cambodia
  • 604,170 Kyrgyzstan
  • 568,520 Mozambique
  • 556,551 New Caledonia
  • 500,591 Libya
  • 448,519 Mongolia
  • 390,791 Ethiopia
  • 370,145 Barbados
  • 345,493 French Guiana
  • 342,486 French Polynesia
  • 340,925 Brunei Darussalam
  • 326,800 Zambia
  • 318,171 Namibia
  • 315,092 Guyana
  • 310,542 Haiti
  • 271,574 Fiji
  • 221,867 Botswana
  • 221,733 Afghanistan
  • 219,735 Belize
  • 215,275 Bahamas
  • 204,960 Gabon
  • 203,569 Congo, Democratic Republic
  • 194,216 Maldives
  • 174,382 Mayotte
  • 160,491 Cape Verde
  • 157,251 Suriname
  • 139,238 Guam
  • 121,385 Saint Lucia
  • 120,812 Andorra
  • 117,492 Benin
  • 112,843 Antigua And Barbuda
  • 106,190 Rwanda
  • 103,902 Saint Vincent And Grenadines
  • 97,455 Burkina Faso
  • 96,974 Tajikistan
  • 96,803 Laos
  • 90,740 Aruba
  • 83,280 Grenada
  • 80,477 Djibouti
  • 73,107 Guinea
  • 73,057 Congo
  • 71,471 Togo
  • 70,697 Malawi
  • 69,933 Mauritania
  • 63,463 Monaco
  • 62,121 Saint Kitts And Nevis
  • 60,372 Bhutan
  • 58,412 Cayman Islands
  • 57,597 Seychelles
  • 56,364 Mali
  • 52,670 Faroe Islands
  • 48,103 Virgin Islands, U.S.
  • 38,243 Gibraltar
  • 30,967 Niger
  • 15,485 Equatorial Guinea
Site explorer

502 million keywords

  • 156,250,812 United States
  • 22,973,207 France
  • 21,640,900 Japan
  • 20,462,987 United Kingdom
  • 20,443,598 Germany
  • 18,071,327 India
  • 16,826,853 Brazil
  • 16,447,645 Canada
  • 15,392,195 Italy
  • 14,562,985 Australia
  • 12,507,615 Russian Federation
  • 11,486,933 Spain
  • 11,301,480 Poland
  • 11,301,021 Turkey
  • 11,269,708 Mexico
  • 8,104,836 Indonesia
  • 6,482,687 Netherlands
  • 6,292,326 Argentina
  • 5,716,422 Viet Nam
  • 5,407,264 Colombia
  • 4,963,448 Ukraine
  • 3,523,618 Taiwan
  • 3,361,833 Philippines
  • 3,227,286 Sweden
  • 2,963,983 Chile
  • 2,601,158 Venezuela
  • 2,580,511 Thailand
  • 2,503,749 Peru
  • 2,417,662 Greece
  • 2,384,666 Belgium
  • 2,224,129 Austria
  • 2,214,174 Hungary
  • 2,171,637 Pakistan
  • 2,164,303 Egypt
  • 2,112,068 Malaysia
  • 2,091,010 Denmark
  • 2,029,238 Czech Republic
  • 2,016,438 Romania
  • 1,965,286 Korea
  • 1,814,980 Algeria
  • 1,761,262 Finland
  • 1,728,939 Israel
  • 1,642,747 Saudi Arabia
  • 1,626,926 South Africa
  • 1,586,843 Portugal
  • 1,574,008 Ecuador
  • 1,426,512 Morocco
  • 1,389,540 Switzerland
  • 1,337,586 Hong Kong
  • 1,278,771 Singapore
  • 1,257,021 Norway
  • 1,111,968 Bulgaria
  • 1,057,812 New Zealand
  • 1,010,147 Serbia
  • 980,182 Slovakia
  • 841,061 Kazakhstan
  • 838,804 Ireland
  • 807,624 Croatia
  • 732,682 Belarus
  • 684,299 United Arab Emirates
  • 593,364 Tunisia
  • 579,846 Uruguay
  • 568,499 Dominican Republic
  • 560,256 Bangladesh
  • 556,222 Bolivia
  • 541,906 Sri Lanka
  • 528,365 Lithuania
  • 476,406 Costa Rica
  • 461,303 Slovenia
  • 437,536 Guatemala
  • 401,985 Nigeria
  • 398,549 Iraq
  • 358,390 Azerbaijan
  • 354,220 Bosnia & Herzegovina
  • 313,102 Latvia
  • 294,468 Panama
  • 285,579 El Salvador
  • 277,101 Estonia
  • 265,878 Kenya
  • 255,817 Moldova
  • 253,432 Paraguay
  • 242,658 Jordan
  • 230,712 Armenia
  • 229,893 Puerto Rico
  • 220,318 Honduras
  • 218,911 Georgia
  • 148,670 Palestinian Territory
  • 147,326 Qatar
  • 145,787 Ghana
  • 140,160 Macedonia
  • 136,567 Nicaragua
  • 132,205 Jamaica
  • 131,801 Trinidad And Tobago
  • 130,031 Lebanon
  • 123,755 Kuwait
  • 115,743 Mauritius
  • 113,925 Oman
  • 112,025 Albania
  • 106,295 Nepal
  • 93,865 Cote D'Ivoire
  • 91,202 Tanzania
  • 91,003 Cyprus
  • 77,554 Malta
  • 76,430 Cameroon
  • 76,004 Kyrgyzstan
  • 75,659 Senegal
  • 74,506 Luxembourg
  • 72,725 Cambodia
  • 68,032 Bahrain
  • 63,580 Angola
  • 62,934 Libya
  • 60,835 Iceland
  • 57,916 Mozambique
  • 54,050 Guadeloupe
  • 53,486 Montenegro
  • 53,407 Zimbabwe
  • 50,560 Mongolia
  • 49,384 Madagascar
  • 46,881 Ethiopia
  • 30,128 Zambia
  • 30,123 Haiti
  • 26,991 Namibia
  • 26,912 Brunei Darussalam
  • 26,048 Afghanistan
  • 22,581 Martinique
  • 20,048 Bahamas
  • 19,779 Guyana
  • 19,610 Congo, Democratic Republic
  • 18,802 Fiji
  • 18,435 Maldives
  • 17,823 Laos
  • 17,550 Tajikistan
  • 16,715 Suriname
  • 15,973 New Caledonia
  • 15,649 Botswana
  • 15,447 Gabon
  • 12,895 Burkina Faso
  • 12,657 Belize
  • 11,875 Rwanda
  • 11,067 Benin
  • 10,381 Congo
  • 10,297 Cape Verde
  • 9,789 Mali
  • 8,943 French Polynesia
  • 8,301 Saint Vincent And Grenadines
  • 7,747 Togo
  • 7,242 Andorra
  • 6,899 Bhutan
  • 6,043 Antigua And Barbuda
  • 6,036 Malawi
  • 5,984 Niger
  • 5,401 Djibouti
  • 5,224 Virgin Islands, U.S.
  • 3,967 Barbados
  • 3,777 Mauritania
  • 3,657 Seychelles
  • 3,619 Gibraltar
  • 3,148 Guam
  • 2,928 Monaco
  • 2,174 Saint Kitts And Nevis
  • 1,531 Guinea
  • 1,516 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