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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
    940 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (6 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (529 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

6 billion keywords

  • 2,305,993,895 United States
  • 451,556,041 Brazil
  • 304,689,111 France
  • 264,346,984 United Kingdom
  • 156,023,384 Poland
  • 155,702,635 Germany
  • 154,785,754 Spain
  • 133,891,145 Italy
  • 125,036,928 Russian Federation
  • 118,966,699 Mexico
  • 111,637,097 Canada
  • 99,825,985 Argentina
  • 94,062,273 India
  • 91,578,294 Colombia
  • 90,314,205 Japan
  • 81,128,518 Australia
  • 67,132,226 Ukraine
  • 52,452,054 Indonesia
  • 49,942,903 Chile
  • 47,268,073 Turkey
  • 44,081,745 Venezuela
  • 41,323,414 Czech Republic
  • 40,380,209 Philippines
  • 38,264,978 Taiwan
  • 36,845,961 Belgium
  • 36,140,395 Netherlands
  • 35,753,889 Peru
  • 32,084,531 Hungary
  • 31,138,582 Greece
  • 29,498,724 Ecuador
  • 26,250,176 Romania
  • 26,123,702 Finland
  • 24,688,805 Viet Nam
  • 24,488,289 Pakistan
  • 22,484,930 Portugal
  • 22,118,965 Egypt
  • 22,030,380 Sweden
  • 21,797,288 Malaysia
  • 21,665,977 Algeria
  • 20,170,674 Norway
  • 20,039,399 Morocco
  • 17,902,561 Korea
  • 17,518,516 Austria
  • 17,467,233 New Zealand
  • 17,283,567 South Africa
  • 16,497,946 Switzerland
  • 15,747,169 Serbia
  • 14,976,549 Bulgaria
  • 14,921,752 Slovakia
  • 14,320,449 Denmark
  • 13,545,036 Saudi Arabia
  • 12,044,859 Croatia
  • 11,875,648 Belarus
  • 11,381,793 Bolivia
  • 11,029,422 Uruguay
  • 10,854,502 Hong Kong
  • 10,284,598 Tunisia
  • 10,201,375 Israel
  • 10,047,178 Kazakhstan
  • 9,803,363 Ireland
  • 9,790,493 Thailand
  • 9,373,165 Singapore
  • 9,366,971 Dominican Republic
  • 8,471,559 Costa Rica
  • 7,653,596 Lithuania
  • 7,218,902 Slovenia
  • 6,554,558 Sri Lanka
  • 6,516,132 Guatemala
  • 6,307,472 Bangladesh
  • 5,734,467 United Arab Emirates
  • 5,496,828 Bosnia & Herzegovina
  • 5,291,725 Latvia
  • 5,228,503 El Salvador
  • 5,060,280 Panama
  • 4,852,263 Paraguay
  • 4,810,692 Estonia
  • 4,718,267 Moldova
  • 4,682,645 Nigeria
  • 3,856,479 Honduras
  • 3,357,624 Azerbaijan
  • 3,001,233 Armenia
  • 2,713,686 Puerto Rico
  • 2,552,283 Kenya
  • 2,311,418 Jordan
  • 2,282,240 Reunion
  • 2,231,526 Nicaragua
  • 2,231,307 Iraq
  • 2,226,544 Mauritius
  • 2,213,938 Trinidad And Tobago
  • 2,212,984 Macedonia
  • 2,192,979 Georgia
  • 1,862,046 Palestinian Territory
  • 1,861,967 Jamaica
  • 1,621,071 Ghana
  • 1,381,635 Albania
  • 1,371,374 Malta
  • 1,302,357 Qatar
  • 1,205,592 Madagascar
  • 1,200,449 Nepal
  • 1,198,209 Cyprus
  • 1,197,354 Lebanon
  • 1,152,831 Luxembourg
  • 1,114,069 Cote D'Ivoire
  • 1,106,057 Cameroon
  • 1,052,880 Kuwait
  • 1,049,386 Oman
  • 929,618 Senegal
  • 908,262 Montenegro
  • 907,015 Iceland
  • 894,804 Angola
  • 886,873 Guadeloupe
  • 821,490 Martinique
  • 748,829 Yemen
  • 747,050 Cambodia
  • 740,675 Zimbabwe
  • 734,016 Bahrain
  • 716,094 Tanzania
  • 715,481 Kyrgyzstan
  • 653,337 New Caledonia
  • 643,561 Mozambique
  • 621,088 Libya
  • 540,035 Mongolia
  • 477,519 Ethiopia
  • 410,693 Brunei Darussalam
  • 410,276 French Polynesia
  • 407,904 French Guiana
  • 389,075 Zambia
  • 372,301 Guyana
  • 372,070 Namibia
  • 360,792 Haiti
  • 328,824 Fiji
  • 263,016 Botswana
  • 259,476 Belize
  • 258,090 Afghanistan
  • 256,886 Bahamas
  • 240,149 Gabon
  • 236,742 Congo, Democratic Republic
  • 227,387 Maldives
  • 209,400 Mayotte
  • 188,324 Cape Verde
  • 186,995 Suriname
  • 170,842 Guam
  • 148,810 Saint Lucia
  • 144,135 Andorra
  • 140,696 Benin
  • 133,097 Antigua And Barbuda
  • 132,049 Rwanda
  • 123,996 Saint Vincent And Grenadines
  • 116,625 Laos
  • 113,389 Burkina Faso
  • 111,920 Tajikistan
  • 108,370 Aruba
  • 99,773 Grenada
  • 92,966 Djibouti
  • 88,287 Congo
  • 86,227 Togo
  • 85,674 Malawi
  • 80,668 Guinea
  • 80,154 Mauritania
  • 77,383 Monaco
  • 74,345 Saint Kitts And Nevis
  • 71,172 Bhutan
  • 69,936 Cayman Islands
  • 68,834 Seychelles
  • 65,716 Mali
  • 63,352 Faroe Islands
  • 56,539 Virgin Islands, U.S.
  • 46,030 Gibraltar
  • 35,322 Niger
  • 18,503 Equatorial Guinea
Site explorer

529 million keywords

  • 169,387,843 United States
  • 26,052,419 Japan
  • 22,778,742 France
  • 20,189,501 Germany
  • 18,235,638 India
  • 18,088,533 United Kingdom
  • 17,662,098 Brazil
  • 17,272,474 Canada
  • 16,116,649 Australia
  • 15,155,060 Italy
  • 14,205,440 Russian Federation
  • 11,849,387 Mexico
  • 11,630,636 Spain
  • 11,129,434 Turkey
  • 10,973,506 Poland
  • 9,160,974 Indonesia
  • 6,428,075 Argentina
  • 6,311,812 Netherlands
  • 5,980,001 Ukraine
  • 5,545,273 Viet Nam
  • 5,469,403 Colombia
  • 3,791,409 Sweden
  • 3,655,127 Taiwan
  • 3,460,540 Philippines
  • 3,043,358 Chile
  • 2,673,716 Venezuela
  • 2,656,680 Thailand
  • 2,578,793 Peru
  • 2,547,975 Austria
  • 2,521,885 Greece
  • 2,485,169 Czech Republic
  • 2,464,475 Belgium
  • 2,382,683 Denmark
  • 2,311,530 Hungary
  • 2,243,010 Egypt
  • 2,224,396 Pakistan
  • 2,162,560 Malaysia
  • 2,096,923 Romania
  • 2,024,764 Korea
  • 1,984,742 Israel
  • 1,861,437 Algeria
  • 1,829,653 Finland
  • 1,682,696 Saudi Arabia
  • 1,642,666 Norway
  • 1,641,537 Singapore
  • 1,640,421 South Africa
  • 1,630,793 Portugal
  • 1,606,416 Ecuador
  • 1,506,505 Hong Kong
  • 1,476,531 Morocco
  • 1,438,805 Switzerland
  • 1,201,750 New Zealand
  • 1,141,637 Bulgaria
  • 1,052,901 Serbia
  • 1,024,002 Slovakia
  • 866,521 Kazakhstan
  • 862,462 Ireland
  • 840,086 Croatia
  • 760,169 Belarus
  • 680,448 United Arab Emirates
  • 612,200 Tunisia
  • 604,027 Uruguay
  • 581,326 Dominican Republic
  • 576,023 Bangladesh
  • 564,991 Bolivia
  • 559,238 Sri Lanka
  • 547,712 Lithuania
  • 488,166 Costa Rica
  • 480,872 Slovenia
  • 443,790 Guatemala
  • 413,541 Nigeria
  • 403,244 Iraq
  • 367,601 Azerbaijan
  • 363,410 Bosnia & Herzegovina
  • 324,266 Latvia
  • 300,324 Panama
  • 291,409 El Salvador
  • 287,941 Estonia
  • 267,415 Kenya
  • 265,577 Moldova
  • 260,450 Paraguay
  • 247,779 Jordan
  • 237,046 Armenia
  • 231,300 Puerto Rico
  • 225,598 Georgia
  • 223,876 Honduras
  • 153,598 Palestinian Territory
  • 152,302 Qatar
  • 151,287 Ghana
  • 145,564 Macedonia
  • 139,159 Nicaragua
  • 137,524 Jamaica
  • 137,121 Trinidad And Tobago
  • 132,007 Lebanon
  • 127,107 Kuwait
  • 119,775 Mauritius
  • 115,397 Oman
  • 115,273 Albania
  • 112,179 Nepal
  • 97,587 Cote D'Ivoire
  • 94,167 Tanzania
  • 94,001 Cyprus
  • 80,319 Malta
  • 79,492 Cameroon
  • 78,944 Kyrgyzstan
  • 78,106 Senegal
  • 77,296 Luxembourg
  • 75,359 Cambodia
  • 67,812 Bahrain
  • 65,537 Libya
  • 64,966 Angola
  • 63,047 Iceland
  • 59,383 Mozambique
  • 55,917 Montenegro
  • 55,910 Guadeloupe
  • 52,421 Zimbabwe
  • 52,369 Mongolia
  • 51,420 Madagascar
  • 48,486 Ethiopia
  • 31,068 Haiti
  • 29,231 Zambia
  • 27,802 Brunei Darussalam
  • 27,769 Namibia
  • 26,194 Afghanistan
  • 20,708 Guyana
  • 20,640 Bahamas
  • 20,039 Congo, Democratic Republic
  • 19,703 Fiji
  • 18,921 Maldives
  • 18,883 Laos
  • 17,667 Tajikistan
  • 17,302 Suriname
  • 16,160 Botswana
  • 15,983 Gabon
  • 13,143 Belize
  • 12,861 Burkina Faso
  • 12,501 Rwanda
  • 11,216 Benin
  • 10,797 Congo
  • 10,622 Cape Verde
  • 10,065 Mali
  • 7,890 Togo
  • 7,602 Saint Vincent And Grenadines
  • 7,376 Andorra
  • 7,234 Bhutan
  • 6,204 Antigua And Barbuda
  • 6,171 Malawi
  • 6,070 Niger
  • 5,452 Djibouti
  • 4,647 Virgin Islands, U.S.
  • 3,732 Seychelles
  • 3,566 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