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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
    1000 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (7 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (1 billion) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

7 billion keywords

  • 2,895,029,439 United States
  • 494,547,545 Brazil
  • 330,158,585 France
  • 308,785,546 United Kingdom
  • 177,226,925 Germany
  • 172,447,104 Spain
  • 168,793,628 Poland
  • 151,556,312 Italy
  • 133,344,444 Russian Federation
  • 130,640,247 Mexico
  • 129,841,601 Canada
  • 113,014,431 Argentina
  • 106,422,655 Japan
  • 105,729,060 India
  • 98,546,099 Colombia
  • 94,184,525 Australia
  • 72,850,702 Ukraine
  • 56,864,403 Indonesia
  • 55,127,347 Chile
  • 53,254,120 Turkey
  • 47,389,879 Venezuela
  • 46,247,222 Czech Republic
  • 45,136,257 Philippines
  • 43,551,901 Netherlands
  • 42,034,944 Taiwan
  • 40,898,937 Belgium
  • 39,397,799 Peru
  • 35,135,366 Hungary
  • 34,817,823 Greece
  • 32,173,846 Ecuador
  • 28,675,777 Romania
  • 28,571,868 Finland
  • 26,346,013 Viet Nam
  • 26,058,661 Pakistan
  • 25,442,027 Portugal
  • 24,953,577 Sweden
  • 24,586,348 Egypt
  • 24,248,677 Malaysia
  • 22,823,175 Algeria
  • 22,140,510 Norway
  • 21,548,742 Morocco
  • 20,498,818 South Africa
  • 20,015,464 Thailand
  • 19,858,404 Austria
  • 19,712,581 New Zealand
  • 19,428,300 Korea
  • 18,340,074 Switzerland
  • 17,327,957 Serbia
  • 16,436,586 Slovakia
  • 16,393,529 Denmark
  • 16,208,764 Bulgaria
  • 14,789,907 Saudi Arabia
  • 13,328,926 Croatia
  • 12,820,088 Bolivia
  • 12,794,957 Belarus
  • 12,771,184 Hong Kong
  • 12,639,068 Israel
  • 12,331,424 Uruguay
  • 11,672,340 Ireland
  • 11,121,202 Singapore
  • 10,999,688 Tunisia
  • 10,636,859 Kazakhstan
  • 10,273,972 Dominican Republic
  • 9,654,073 Costa Rica
  • 8,342,765 Lithuania
  • 7,859,233 Slovenia
  • 7,403,324 Guatemala
  • 7,270,231 Sri Lanka
  • 7,121,278 Bangladesh
  • 6,514,214 United Arab Emirates
  • 5,977,324 Bosnia & Herzegovina
  • 5,958,345 Panama
  • 5,845,091 El Salvador
  • 5,754,410 Latvia
  • 5,551,964 Nigeria
  • 5,483,894 Paraguay
  • 5,301,339 Estonia
  • 4,999,913 Moldova
  • 4,353,222 Honduras
  • 3,569,055 Azerbaijan
  • 3,174,533 Armenia
  • 3,171,222 Kenya
  • 3,091,483 Puerto Rico
  • 2,836,081 Trinidad And Tobago
  • 2,681,307 Jordan
  • 2,645,861 Mauritius
  • 2,505,979 Reunion
  • 2,450,277 Nicaragua
  • 2,438,744 Macedonia
  • 2,359,133 Georgia
  • 2,349,687 Jamaica
  • 2,250,475 Iraq
  • 1,956,013 Palestinian Territory
  • 1,914,706 Ghana
  • 1,585,510 Malta
  • 1,540,781 Albania
  • 1,492,025 Qatar
  • 1,482,450 Cyprus
  • 1,474,764 Lebanon
  • 1,427,592 Nepal
  • 1,406,666 Zimbabwe
  • 1,332,508 Madagascar
  • 1,311,774 Luxembourg
  • 1,281,583 Cote D'Ivoire
  • 1,261,029 Cameroon
  • 1,258,795 Kuwait
  • 1,191,756 Oman
  • 1,057,577 Senegal
  • 1,019,811 Angola
  • 1,001,190 Iceland
  • 986,017 Montenegro
  • 973,188 Guadeloupe
  • 912,168 Martinique
  • 863,879 Yemen
  • 856,483 Cambodia
  • 838,378 Tanzania
  • 838,273 Bahrain
  • 779,631 Kyrgyzstan
  • 725,565 Mozambique
  • 705,971 New Caledonia
  • 693,221 Libya
  • 586,773 Mongolia
  • 534,419 Ethiopia
  • 474,903 Zambia
  • 456,393 Brunei Darussalam
  • 455,748 Namibia
  • 449,198 French Polynesia
  • 443,702 French Guiana
  • 442,730 Haiti
  • 420,000 Fiji
  • 416,652 Guyana
  • 320,216 Belize
  • 319,794 Botswana
  • 304,737 Bahamas
  • 284,702 Gabon
  • 276,492 Afghanistan
  • 261,365 Congo, Democratic Republic
  • 251,003 Maldives
  • 228,015 Mayotte
  • 222,754 Suriname
  • 218,375 Cape Verde
  • 208,015 Guam
  • 175,617 Saint Lucia
  • 164,754 Antigua And Barbuda
  • 160,215 Benin
  • 159,474 Andorra
  • 158,176 Rwanda
  • 151,019 Laos
  • 138,335 Saint Vincent And Grenadines
  • 130,948 Burkina Faso
  • 129,254 Aruba
  • 118,134 Tajikistan
  • 113,587 Grenada
  • 100,466 Togo
  • 99,963 Djibouti
  • 98,099 Malawi
  • 97,751 Congo
  • 88,797 Mauritania
  • 84,845 Monaco
  • 84,277 Guinea
  • 82,759 Saint Kitts And Nevis
  • 80,053 Cayman Islands
  • 79,688 Bhutan
  • 79,378 Seychelles
  • 75,014 Mali
  • 69,546 Faroe Islands
  • 62,236 Virgin Islands, U.S.
  • 53,055 Gibraltar
  • 41,470 Niger
  • 20,604 Equatorial Guinea
Site explorer

1 billion keywords

  • 332,158,325 United States
  • 52,171,454 Japan
  • 45,572,861 France
  • 40,573,730 United Kingdom
  • 39,206,828 Germany
  • 36,512,033 India
  • 34,222,497 Brazil
  • 33,507,216 Canada
  • 32,239,668 Australia
  • 26,560,082 Italy
  • 24,209,215 Russian Federation
  • 23,707,920 Mexico
  • 22,296,130 Turkey
  • 20,747,964 Spain
  • 18,678,602 Poland
  • 18,342,806 Indonesia
  • 12,861,382 Argentina
  • 11,965,036 Ukraine
  • 11,817,001 Netherlands
  • 10,919,934 Colombia
  • 9,665,794 Viet Nam
  • 7,600,794 Sweden
  • 7,342,285 Taiwan
  • 6,924,520 Philippines
  • 6,084,060 Chile
  • 5,658,732 Thailand
  • 5,012,418 Austria
  • 4,839,289 Venezuela
  • 4,766,921 Czech Republic
  • 4,677,257 Peru
  • 4,576,784 Denmark
  • 4,523,899 Greece
  • 4,381,470 Belgium
  • 4,016,427 Hungary
  • 3,904,514 Egypt
  • 3,765,405 Israel
  • 3,719,386 Pakistan
  • 3,579,033 Malaysia
  • 3,419,639 Romania
  • 3,212,095 Korea
  • 3,095,708 Singapore
  • 3,031,704 Norway
  • 2,881,534 Finland
  • 2,832,669 Algeria
  • 2,813,788 Hong Kong
  • 2,459,715 South Africa
  • 2,446,559 Portugal
  • 2,424,237 Saudi Arabia
  • 2,338,974 New Zealand
  • 2,335,467 Ecuador
  • 2,046,534 Switzerland
  • 1,986,446 Morocco
  • 1,627,505 Bulgaria
  • 1,486,322 Serbia
  • 1,457,978 Slovakia
  • 1,298,283 Ireland
  • 1,192,469 Croatia
  • 1,078,618 Kazakhstan
  • 1,033,198 Belarus
  • 1,000,104 United Arab Emirates
  • 823,352 Uruguay
  • 785,126 Bolivia
  • 783,662 Dominican Republic
  • 782,406 Bangladesh
  • 777,485 Tunisia
  • 765,056 Sri Lanka
  • 762,728 Lithuania
  • 692,070 Costa Rica
  • 672,806 Slovenia
  • 631,368 Guatemala
  • 618,218 Nigeria
  • 493,016 Iraq
  • 475,774 Azerbaijan
  • 474,286 Bosnia & Herzegovina
  • 448,444 Latvia
  • 445,370 Panama
  • 427,218 Kenya
  • 425,087 Estonia
  • 408,392 El Salvador
  • 369,104 Paraguay
  • 350,228 Jordan
  • 347,962 Moldova
  • 326,357 Puerto Rico
  • 316,114 Honduras
  • 310,690 Armenia
  • 298,118 Georgia
  • 229,268 Ghana
  • 225,490 Trinidad And Tobago
  • 223,758 Jamaica
  • 206,974 Palestinian Territory
  • 201,692 Qatar
  • 200,598 Macedonia
  • 198,294 Lebanon
  • 188,764 Kuwait
  • 186,270 Nicaragua
  • 184,768 Mauritius
  • 174,602 Nepal
  • 161,612 Albania
  • 150,026 Cyprus
  • 144,990 Oman
  • 139,816 Tanzania
  • 138,720 Cote D'Ivoire
  • 124,326 Malta
  • 112,568 Luxembourg
  • 110,618 Cameroon
  • 110,370 Senegal
  • 108,416 Kyrgyzstan
  • 107,106 Cambodia
  • 94,106 Angola
  • 93,778 Bahrain
  • 91,440 Iceland
  • 91,216 Libya
  • 86,372 Guadeloupe
  • 79,484 Zimbabwe
  • 78,466 Mozambique
  • 76,996 Montenegro
  • 73,744 Madagascar
  • 73,608 Mongolia
  • 67,614 Ethiopia
  • 46,594 Namibia
  • 46,286 Haiti
  • 44,022 Zambia
  • 38,860 Brunei Darussalam
  • 34,276 Fiji
  • 34,108 Afghanistan
  • 31,450 Bahamas
  • 31,214 Laos
  • 29,814 Guyana
  • 29,658 Suriname
  • 27,508 Congo, Democratic Republic
  • 27,046 Maldives
  • 26,556 Botswana
  • 25,296 Gabon
  • 24,954 Tajikistan
  • 22,056 Rwanda
  • 21,088 Belize
  • 19,972 Burkina Faso
  • 17,882 Congo
  • 17,402 Benin
  • 17,328 Cape Verde
  • 15,736 Mali
  • 14,114 Togo
  • 13,062 Saint Vincent And Grenadines
  • 12,566 Bhutan
  • 12,168 Andorra
  • 11,104 Antigua And Barbuda
  • 10,776 Niger
  • 10,136 Malawi
  • 8,768 Djibouti
  • 7,214 Virgin Islands, U.S.
  • 6,354 Seychelles
  • 6,018 Gibraltar
  • 10 New Caledonia
  • 4 Mauritania
  • 2 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