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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
    953 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (6.1 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (526 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

6.1 billion keywords

  • 2,351,416,387 United States
  • 460,034,634 Brazil
  • 310,203,660 France
  • 266,859,497 United Kingdom
  • 158,720,309 Poland
  • 158,641,134 Germany
  • 157,705,283 Spain
  • 136,427,872 Italy
  • 127,130,917 Russian Federation
  • 121,240,428 Mexico
  • 113,144,852 Canada
  • 101,856,062 Argentina
  • 95,873,621 India
  • 93,121,690 Colombia
  • 92,068,555 Japan
  • 82,170,059 Australia
  • 68,542,854 Ukraine
  • 53,175,383 Indonesia
  • 51,080,050 Chile
  • 47,989,535 Turkey
  • 44,915,522 Venezuela
  • 42,209,974 Czech Republic
  • 41,258,175 Philippines
  • 39,182,786 Taiwan
  • 37,661,616 Belgium
  • 36,921,268 Netherlands
  • 36,618,383 Peru
  • 32,735,982 Hungary
  • 31,792,968 Greece
  • 30,189,825 Ecuador
  • 26,791,966 Romania
  • 26,602,727 Finland
  • 25,068,575 Viet Nam
  • 24,914,028 Pakistan
  • 22,969,733 Portugal
  • 22,551,305 Egypt
  • 22,464,809 Sweden
  • 22,227,508 Malaysia
  • 22,005,550 Algeria
  • 20,435,957 Morocco
  • 20,355,159 Norway
  • 18,362,273 Korea
  • 17,871,533 Austria
  • 17,686,634 New Zealand
  • 17,664,295 South Africa
  • 16,873,587 Switzerland
  • 16,076,186 Serbia
  • 15,274,488 Bulgaria
  • 15,218,022 Slovakia
  • 14,656,235 Denmark
  • 13,748,086 Saudi Arabia
  • 12,290,984 Croatia
  • 12,115,243 Belarus
  • 11,649,666 Bolivia
  • 11,267,524 Uruguay
  • 11,107,444 Hong Kong
  • 10,471,021 Tunisia
  • 10,451,789 Israel
  • 10,231,761 Kazakhstan
  • 10,012,171 Thailand
  • 9,998,215 Ireland
  • 9,601,469 Singapore
  • 9,546,393 Dominican Republic
  • 8,654,337 Costa Rica
  • 7,800,373 Lithuania
  • 7,364,587 Slovenia
  • 6,696,372 Sri Lanka
  • 6,674,096 Guatemala
  • 6,447,507 Bangladesh
  • 5,860,674 United Arab Emirates
  • 5,603,563 Bosnia & Herzegovina
  • 5,392,001 Latvia
  • 5,348,623 El Salvador
  • 5,185,811 Panama
  • 4,961,660 Paraguay
  • 4,917,735 Estonia
  • 4,800,298 Moldova
  • 4,794,638 Nigeria
  • 3,954,493 Honduras
  • 3,411,783 Azerbaijan
  • 3,048,812 Armenia
  • 2,756,635 Puerto Rico
  • 2,631,260 Kenya
  • 2,357,324 Jordan
  • 2,338,787 Reunion
  • 2,277,147 Nicaragua
  • 2,274,282 Mauritius
  • 2,273,264 Iraq
  • 2,262,820 Trinidad And Tobago
  • 2,259,828 Macedonia
  • 2,245,913 Georgia
  • 1,903,670 Jamaica
  • 1,892,153 Palestinian Territory
  • 1,658,011 Ghana
  • 1,411,664 Albania
  • 1,402,584 Malta
  • 1,330,346 Qatar
  • 1,247,448 Nepal
  • 1,237,461 Madagascar
  • 1,225,665 Cyprus
  • 1,224,929 Lebanon
  • 1,180,749 Luxembourg
  • 1,139,544 Cote D'Ivoire
  • 1,132,016 Cameroon
  • 1,074,633 Kuwait
  • 1,068,394 Oman
  • 951,762 Senegal
  • 928,060 Montenegro
  • 927,248 Iceland
  • 918,594 Angola
  • 908,506 Guadeloupe
  • 842,423 Martinique
  • 767,806 Cambodia
  • 760,716 Zimbabwe
  • 760,173 Yemen
  • 748,375 Bahrain
  • 731,710 Kyrgyzstan
  • 730,872 Tanzania
  • 668,049 New Caledonia
  • 655,957 Mozambique
  • 638,143 Libya
  • 553,683 Mongolia
  • 492,003 Ethiopia
  • 420,593 Brunei Darussalam
  • 420,520 French Polynesia
  • 417,633 French Guiana
  • 400,410 Zambia
  • 382,094 Namibia
  • 381,618 Guyana
  • 368,969 Haiti
  • 337,605 Fiji
  • 270,302 Botswana
  • 265,248 Belize
  • 263,624 Afghanistan
  • 262,808 Bahamas
  • 246,148 Gabon
  • 242,416 Congo, Democratic Republic
  • 232,434 Maldives
  • 215,026 Mayotte
  • 192,895 Cape Verde
  • 192,563 Suriname
  • 175,011 Guam
  • 153,590 Saint Lucia
  • 147,134 Andorra
  • 144,651 Benin
  • 136,878 Rwanda
  • 136,105 Antigua And Barbuda
  • 127,080 Saint Vincent And Grenadines
  • 120,116 Laos
  • 116,058 Burkina Faso
  • 114,252 Tajikistan
  • 111,142 Aruba
  • 102,467 Grenada
  • 94,647 Djibouti
  • 90,716 Congo
  • 88,700 Togo
  • 88,293 Malawi
  • 81,893 Guinea
  • 81,805 Mauritania
  • 79,781 Monaco
  • 76,309 Saint Kitts And Nevis
  • 73,231 Bhutan
  • 71,716 Cayman Islands
  • 70,745 Seychelles
  • 67,260 Mali
  • 64,889 Faroe Islands
  • 57,716 Virgin Islands, U.S.
  • 47,042 Gibraltar
  • 36,040 Niger
  • 19,017 Equatorial Guinea
Site explorer

526 million keywords

  • 165,996,271 United States
  • 26,053,791 Japan
  • 22,779,513 France
  • 20,190,014 Germany
  • 18,352,657 United Kingdom
  • 18,236,547 India
  • 17,662,805 Brazil
  • 17,272,806 Canada
  • 16,116,984 Australia
  • 15,155,549 Italy
  • 14,205,919 Russian Federation
  • 11,849,550 Mexico
  • 11,631,085 Spain
  • 11,129,812 Turkey
  • 10,975,837 Poland
  • 9,161,189 Indonesia
  • 6,428,159 Argentina
  • 6,309,552 Netherlands
  • 5,980,074 Ukraine
  • 5,559,710 Viet Nam
  • 5,468,663 Colombia
  • 3,795,500 Sweden
  • 3,664,003 Taiwan
  • 3,452,809 Philippines
  • 3,045,579 Chile
  • 2,677,382 Venezuela
  • 2,675,588 Thailand
  • 2,585,647 Peru
  • 2,547,821 Austria
  • 2,520,342 Greece
  • 2,482,488 Czech Republic
  • 2,459,843 Belgium
  • 2,379,078 Denmark
  • 2,308,334 Hungary
  • 2,247,182 Egypt
  • 2,230,014 Pakistan
  • 2,171,255 Malaysia
  • 2,097,808 Romania
  • 2,030,088 Korea
  • 1,987,635 Israel
  • 1,866,141 Algeria
  • 1,831,295 Finland
  • 1,689,332 Saudi Arabia
  • 1,644,418 Norway
  • 1,641,435 Singapore
  • 1,640,370 South Africa
  • 1,630,014 Portugal
  • 1,604,772 Ecuador
  • 1,512,427 Hong Kong
  • 1,477,976 Morocco
  • 1,430,150 Switzerland
  • 1,206,784 New Zealand
  • 1,142,448 Bulgaria
  • 1,051,941 Serbia
  • 1,024,989 Slovakia
  • 869,385 Kazakhstan
  • 865,037 Ireland
  • 839,798 Croatia
  • 761,785 Belarus
  • 683,344 United Arab Emirates
  • 612,981 Tunisia
  • 598,724 Uruguay
  • 579,788 Dominican Republic
  • 578,847 Bangladesh
  • 565,357 Bolivia
  • 560,522 Sri Lanka
  • 548,745 Lithuania
  • 488,412 Costa Rica
  • 481,184 Slovenia
  • 444,379 Guatemala
  • 412,313 Nigeria
  • 404,938 Iraq
  • 367,455 Azerbaijan
  • 363,676 Bosnia & Herzegovina
  • 324,406 Latvia
  • 299,862 Panama
  • 291,559 El Salvador
  • 288,311 Estonia
  • 269,091 Kenya
  • 265,385 Moldova
  • 260,535 Paraguay
  • 248,926 Jordan
  • 237,415 Armenia
  • 231,664 Puerto Rico
  • 225,923 Georgia
  • 224,139 Honduras
  • 153,732 Palestinian Territory
  • 152,498 Qatar
  • 151,458 Ghana
  • 145,496 Macedonia
  • 139,214 Nicaragua
  • 137,609 Jamaica
  • 137,169 Trinidad And Tobago
  • 131,836 Lebanon
  • 127,133 Kuwait
  • 119,772 Mauritius
  • 115,424 Oman
  • 115,306 Albania
  • 112,262 Nepal
  • 97,617 Cote D'Ivoire
  • 94,056 Tanzania
  • 93,880 Cyprus
  • 80,354 Malta
  • 79,487 Cameroon
  • 78,934 Kyrgyzstan
  • 78,250 Senegal
  • 77,350 Luxembourg
  • 75,538 Cambodia
  • 67,877 Bahrain
  • 65,800 Libya
  • 64,982 Angola
  • 63,160 Iceland
  • 59,388 Mozambique
  • 56,008 Montenegro
  • 55,989 Guadeloupe
  • 52,551 Zimbabwe
  • 52,409 Mongolia
  • 51,442 Madagascar
  • 48,759 Ethiopia
  • 30,988 Haiti
  • 29,292 Zambia
  • 27,927 Brunei Darussalam
  • 27,876 Namibia
  • 26,247 Afghanistan
  • 20,785 Guyana
  • 20,680 Bahamas
  • 20,093 Congo, Democratic Republic
  • 19,839 Fiji
  • 18,945 Maldives
  • 18,917 Laos
  • 17,728 Tajikistan
  • 17,357 Suriname
  • 16,237 Botswana
  • 16,025 Gabon
  • 13,161 Belize
  • 12,878 Burkina Faso
  • 12,592 Rwanda
  • 11,266 Benin
  • 10,792 Congo
  • 10,626 Cape Verde
  • 10,118 Mali
  • 7,922 Togo
  • 7,619 Saint Vincent And Grenadines
  • 7,383 Andorra
  • 7,245 Bhutan
  • 6,216 Antigua And Barbuda
  • 6,177 Malawi
  • 6,070 Niger
  • 5,468 Djibouti
  • 4,635 Virgin Islands, U.S.
  • 3,735 Seychelles
  • 3,563 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