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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
    920 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (5.9 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (538 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

5.9 billion keywords

  • 2,254,878,805 United States
  • 442,607,717 Brazil
  • 298,482,609 France
  • 260,711,937 United Kingdom
  • 153,125,802 Poland
  • 152,481,291 Germany
  • 151,290,698 Spain
  • 131,054,493 Italy
  • 122,637,949 Russian Federation
  • 116,174,178 Mexico
  • 110,016,182 Canada
  • 97,552,913 Argentina
  • 92,143,944 India
  • 89,369,561 Colombia
  • 88,457,036 Japan
  • 79,958,931 Australia
  • 65,515,317 Ukraine
  • 51,421,210 Indonesia
  • 48,734,326 Chile
  • 46,403,598 Turkey
  • 43,166,573 Venezuela
  • 40,321,795 Czech Republic
  • 39,529,530 Philippines
  • 37,292,767 Taiwan
  • 35,931,853 Belgium
  • 35,313,810 Netherlands
  • 34,824,480 Peru
  • 31,367,358 Hungary
  • 30,432,180 Greece
  • 28,718,217 Ecuador
  • 25,665,366 Romania
  • 25,592,223 Finland
  • 24,264,966 Viet Nam
  • 23,993,307 Pakistan
  • 21,950,885 Portugal
  • 21,679,291 Egypt
  • 21,514,253 Sweden
  • 21,291,820 Algeria
  • 21,273,329 Malaysia
  • 19,955,830 Norway
  • 19,620,692 Morocco
  • 17,415,030 Korea
  • 17,228,018 New Zealand
  • 17,130,367 Austria
  • 16,835,271 South Africa
  • 16,062,593 Switzerland
  • 15,397,687 Serbia
  • 14,665,303 Bulgaria
  • 14,588,621 Slovakia
  • 13,945,933 Denmark
  • 13,304,048 Saudi Arabia
  • 11,776,580 Croatia
  • 11,606,934 Belarus
  • 11,096,664 Bolivia
  • 10,768,578 Uruguay
  • 10,568,813 Hong Kong
  • 10,071,547 Tunisia
  • 9,939,942 Israel
  • 9,825,301 Kazakhstan
  • 9,568,665 Ireland
  • 9,546,707 Thailand
  • 9,148,524 Dominican Republic
  • 9,121,783 Singapore
  • 8,279,464 Costa Rica
  • 7,483,239 Lithuania
  • 7,053,812 Slovenia
  • 6,405,992 Sri Lanka
  • 6,313,850 Guatemala
  • 6,141,895 Bangladesh
  • 5,594,232 United Arab Emirates
  • 5,381,039 Bosnia & Herzegovina
  • 5,176,400 Latvia
  • 5,089,518 El Salvador
  • 4,916,399 Panama
  • 4,735,428 Paraguay
  • 4,690,756 Estonia
  • 4,622,811 Moldova
  • 4,560,826 Nigeria
  • 3,743,919 Honduras
  • 3,294,205 Azerbaijan
  • 2,946,858 Armenia
  • 2,658,007 Puerto Rico
  • 2,469,256 Kenya
  • 2,258,036 Jordan
  • 2,220,920 Reunion
  • 2,186,221 Iraq
  • 2,184,426 Nicaragua
  • 2,173,468 Mauritius
  • 2,161,375 Macedonia
  • 2,159,515 Trinidad And Tobago
  • 2,137,045 Georgia
  • 1,828,300 Palestinian Territory
  • 1,812,928 Jamaica
  • 1,579,713 Ghana
  • 1,344,769 Albania
  • 1,333,206 Malta
  • 1,272,190 Qatar
  • 1,171,624 Madagascar
  • 1,167,798 Cyprus
  • 1,165,580 Lebanon
  • 1,152,749 Nepal
  • 1,123,550 Luxembourg
  • 1,086,777 Cote D'Ivoire
  • 1,078,312 Cameroon
  • 1,029,810 Kuwait
  • 1,026,633 Oman
  • 904,498 Senegal
  • 887,172 Montenegro
  • 881,593 Iceland
  • 870,631 Angola
  • 862,158 Guadeloupe
  • 799,270 Martinique
  • 735,256 Yemen
  • 723,099 Cambodia
  • 716,679 Bahrain
  • 715,398 Zimbabwe
  • 700,196 Tanzania
  • 694,932 Kyrgyzstan
  • 636,577 New Caledonia
  • 628,485 Mozambique
  • 601,184 Libya
  • 522,021 Mongolia
  • 460,138 Ethiopia
  • 398,754 Brunei Darussalam
  • 398,705 French Polynesia
  • 396,639 French Guiana
  • 377,138 Zambia
  • 361,909 Namibia
  • 360,848 Guyana
  • 351,549 Haiti
  • 315,760 Fiji
  • 254,747 Botswana
  • 252,507 Belize
  • 251,713 Afghanistan
  • 249,796 Bahamas
  • 233,645 Gabon
  • 230,526 Congo, Democratic Republic
  • 221,395 Maldives
  • 203,111 Mayotte
  • 183,129 Cape Verde
  • 181,024 Suriname
  • 165,848 Guam
  • 143,807 Saint Lucia
  • 140,520 Andorra
  • 136,441 Benin
  • 129,303 Antigua And Barbuda
  • 126,993 Rwanda
  • 120,618 Saint Vincent And Grenadines
  • 112,913 Laos
  • 110,811 Burkina Faso
  • 109,142 Tajikistan
  • 105,237 Aruba
  • 96,739 Grenada
  • 91,079 Djibouti
  • 85,383 Congo
  • 83,330 Togo
  • 82,836 Malawi
  • 79,282 Guinea
  • 78,317 Mauritania
  • 74,970 Monaco
  • 72,168 Saint Kitts And Nevis
  • 68,971 Bhutan
  • 68,025 Cayman Islands
  • 66,624 Seychelles
  • 64,190 Mali
  • 61,635 Faroe Islands
  • 55,111 Virgin Islands, U.S.
  • 44,852 Gibraltar
  • 34,556 Niger
  • 17,886 Equatorial Guinea
Site explorer

538 million keywords

  • 171,710,097 United States
  • 25,972,785 Japan
  • 23,572,738 France
  • 21,185,362 Germany
  • 19,320,726 United Kingdom
  • 18,429,941 India
  • 18,185,434 Brazil
  • 17,329,750 Canada
  • 15,632,146 Australia
  • 15,470,574 Italy
  • 14,588,798 Russian Federation
  • 12,090,044 Spain
  • 11,876,139 Mexico
  • 11,343,668 Turkey
  • 11,322,481 Poland
  • 9,264,919 Indonesia
  • 6,510,133 Netherlands
  • 6,492,702 Argentina
  • 6,111,447 Ukraine
  • 5,894,740 Viet Nam
  • 5,501,359 Colombia
  • 3,940,535 Sweden
  • 3,674,013 Taiwan
  • 3,478,392 Philippines
  • 3,060,841 Chile
  • 2,676,798 Thailand
  • 2,675,372 Venezuela
  • 2,644,697 Austria
  • 2,590,856 Peru
  • 2,541,728 Czech Republic
  • 2,534,755 Greece
  • 2,488,837 Belgium
  • 2,435,988 Denmark
  • 2,322,977 Hungary
  • 2,263,483 Egypt
  • 2,243,264 Pakistan
  • 2,177,311 Malaysia
  • 2,109,575 Romania
  • 2,046,327 Israel
  • 2,045,113 Korea
  • 1,876,055 Algeria
  • 1,839,539 Finland
  • 1,695,218 Singapore
  • 1,693,374 Saudi Arabia
  • 1,673,757 Norway
  • 1,655,382 South Africa
  • 1,639,703 Portugal
  • 1,616,673 Ecuador
  • 1,514,204 Hong Kong
  • 1,485,853 Morocco
  • 1,449,992 Switzerland
  • 1,205,060 New Zealand
  • 1,154,477 Bulgaria
  • 1,058,245 Serbia
  • 1,029,560 Slovakia
  • 874,133 Kazakhstan
  • 867,238 Ireland
  • 844,624 Croatia
  • 765,378 Belarus
  • 694,704 United Arab Emirates
  • 615,164 Tunisia
  • 608,132 Uruguay
  • 586,052 Dominican Republic
  • 582,191 Bangladesh
  • 570,917 Bolivia
  • 563,247 Sri Lanka
  • 551,200 Lithuania
  • 490,725 Costa Rica
  • 483,448 Slovenia
  • 446,461 Guatemala
  • 416,852 Nigeria
  • 409,487 Iraq
  • 372,497 Azerbaijan
  • 367,179 Bosnia & Herzegovina
  • 326,462 Latvia
  • 301,833 Panama
  • 292,530 El Salvador
  • 289,655 Estonia
  • 269,960 Kenya
  • 266,993 Moldova
  • 261,786 Paraguay
  • 249,630 Jordan
  • 239,813 Armenia
  • 233,121 Puerto Rico
  • 226,810 Georgia
  • 225,104 Honduras
  • 154,269 Palestinian Territory
  • 153,120 Qatar
  • 151,939 Ghana
  • 146,435 Macedonia
  • 140,077 Nicaragua
  • 138,045 Jamaica
  • 137,556 Trinidad And Tobago
  • 134,534 Lebanon
  • 128,020 Kuwait
  • 120,545 Mauritius
  • 116,758 Albania
  • 116,050 Oman
  • 112,868 Nepal
  • 97,754 Cote D'Ivoire
  • 94,731 Cyprus
  • 94,671 Tanzania
  • 80,810 Malta
  • 79,866 Cameroon
  • 79,488 Kyrgyzstan
  • 78,706 Luxembourg
  • 78,427 Senegal
  • 75,759 Cambodia
  • 69,375 Bahrain
  • 65,805 Libya
  • 65,575 Angola
  • 63,398 Iceland
  • 59,642 Mozambique
  • 56,613 Montenegro
  • 56,070 Guadeloupe
  • 53,646 Zimbabwe
  • 52,561 Mongolia
  • 51,682 Madagascar
  • 48,957 Ethiopia
  • 31,273 Haiti
  • 30,185 Zambia
  • 28,333 Brunei Darussalam
  • 27,892 Namibia
  • 26,566 Afghanistan
  • 22,573 Martinique
  • 20,878 Bahamas
  • 20,807 Guyana
  • 20,230 Congo, Democratic Republic
  • 19,794 Fiji
  • 19,394 Maldives
  • 18,968 Laos
  • 18,107 Tajikistan
  • 17,345 Suriname
  • 16,339 Botswana
  • 16,082 Gabon
  • 15,968 New Caledonia
  • 13,211 Belize
  • 13,153 Burkina Faso
  • 12,493 Rwanda
  • 11,365 Benin
  • 10,840 Congo
  • 10,712 Cape Verde
  • 10,131 Mali
  • 8,937 French Polynesia
  • 7,962 Saint Vincent And Grenadines
  • 7,946 Togo
  • 7,478 Andorra
  • 7,211 Bhutan
  • 6,283 Antigua And Barbuda
  • 6,198 Malawi
  • 6,108 Niger
  • 5,497 Djibouti
  • 4,941 Virgin Islands, U.S.
  • 3,776 Mauritania
  • 3,743 Seychelles
  • 3,608 Gibraltar
  • 3,146 Guam
  • 2,924 Monaco
  • 2,173 Saint Kitts And Nevis
  • 1,531 Guinea
  • 1,515 Reunion
  • 1,074 Grenada
  • 770 Faroe Islands
  • 460 Aruba
  • 417 Yemen
  • 409 Equatorial Guinea
  • 85 Mayotte
  • 18 Cayman Islands
  • 9 Saint Lucia
  • 5 French Guiana

Backlink index

Ahrefs boasts the world's largest index of live backlinks that is updated with fresh data every 15-30 minutes. We use this backlink data to calculate our proprietary metrics: Ahrefs Rank, Domain Rating & URL Rating.

Domains (POST-VETTING)
Pages in index
Internal backlinks
External backlinks

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

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