We're hiring data scientist!

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
    1 billion pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (7.4 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (473 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

7.4 billion keywords

  • 3,098,963,599 United States
  • 513,609,745 Brazil
  • 341,901,490 France
  • 316,249,691 United Kingdom
  • 184,956,208 Germany
  • 179,593,079 Spain
  • 174,901,237 Poland
  • 158,016,053 Italy
  • 137,956,553 Russian Federation
  • 136,096,148 Mexico
  • 133,666,748 Canada
  • 118,135,951 Argentina
  • 111,204,081 Japan
  • 109,890,325 India
  • 101,602,220 Colombia
  • 96,779,195 Australia
  • 76,304,825 Ukraine
  • 59,000,182 Indonesia
  • 57,443,412 Chile
  • 55,371,395 Turkey
  • 48,953,021 Venezuela
  • 48,568,929 Czech Republic
  • 47,226,516 Philippines
  • 45,928,417 Netherlands
  • 44,055,194 Taiwan
  • 42,774,281 Belgium
  • 41,162,339 Peru
  • 36,634,856 Hungary
  • 36,387,149 Greece
  • 33,510,593 Ecuador
  • 29,851,561 Romania
  • 29,744,267 Finland
  • 27,150,711 Pakistan
  • 27,109,775 Viet Nam
  • 26,655,841 Portugal
  • 26,149,455 Sweden
  • 25,677,300 Egypt
  • 25,414,527 Malaysia
  • 23,591,658 Algeria
  • 22,623,189 Norway
  • 22,319,219 Morocco
  • 21,625,984 South Africa
  • 21,478,164 Thailand
  • 20,687,977 Austria
  • 20,423,539 Korea
  • 20,221,795 New Zealand
  • 19,251,479 Switzerland
  • 18,070,916 Serbia
  • 17,273,056 Denmark
  • 17,164,333 Slovakia
  • 16,848,234 Bulgaria
  • 15,425,017 Saudi Arabia
  • 13,896,500 Croatia
  • 13,511,391 Israel
  • 13,483,408 Hong Kong
  • 13,399,998 Bolivia
  • 13,321,442 Belarus
  • 12,830,448 Uruguay
  • 12,350,583 Ireland
  • 11,756,127 Singapore
  • 11,401,817 Tunisia
  • 11,091,641 Kazakhstan
  • 10,687,503 Dominican Republic
  • 10,038,765 Costa Rica
  • 8,705,142 Lithuania
  • 8,183,165 Slovenia
  • 7,665,120 Guatemala
  • 7,610,256 Sri Lanka
  • 7,529,508 Bangladesh
  • 6,852,704 United Arab Emirates
  • 6,225,758 Panama
  • 6,204,308 Bosnia & Herzegovina
  • 6,065,524 El Salvador
  • 5,993,519 Latvia
  • 5,866,752 Nigeria
  • 5,718,337 Paraguay
  • 5,572,253 Estonia
  • 5,174,673 Moldova
  • 4,546,942 Honduras
  • 3,690,585 Azerbaijan
  • 3,410,223 Kenya
  • 3,265,838 Armenia
  • 3,232,907 Puerto Rico
  • 3,008,289 Trinidad And Tobago
  • 2,814,391 Jordan
  • 2,779,498 Mauritius
  • 2,618,207 Reunion
  • 2,548,773 Macedonia
  • 2,539,612 Nicaragua
  • 2,499,012 Jamaica
  • 2,468,156 Georgia
  • 2,340,374 Iraq
  • 2,027,622 Palestinian Territory
  • 2,023,144 Ghana
  • 1,668,465 Malta
  • 1,616,273 Albania
  • 1,569,906 Qatar
  • 1,566,462 Cyprus
  • 1,564,540 Lebanon
  • 1,526,166 Nepal
  • 1,462,127 Zimbabwe
  • 1,399,838 Madagascar
  • 1,378,072 Luxembourg
  • 1,347,706 Cote D'Ivoire
  • 1,327,881 Kuwait
  • 1,324,559 Cameroon
  • 1,256,880 Oman
  • 1,110,786 Senegal
  • 1,074,279 Angola
  • 1,052,083 Iceland
  • 1,026,163 Montenegro
  • 1,015,649 Guadeloupe
  • 954,042 Martinique
  • 904,560 Cambodia
  • 902,100 Yemen
  • 883,768 Tanzania
  • 880,331 Bahrain
  • 819,093 Kyrgyzstan
  • 754,866 Mozambique
  • 735,492 Libya
  • 732,620 New Caledonia
  • 625,493 Mongolia
  • 577,560 Ethiopia
  • 508,295 Zambia
  • 486,651 Namibia
  • 481,390 Brunei Darussalam
  • 469,251 French Polynesia
  • 468,595 Haiti
  • 461,526 French Guiana
  • 449,645 Fiji
  • 437,180 Guyana
  • 341,336 Belize
  • 339,498 Botswana
  • 323,144 Bahamas
  • 300,210 Gabon
  • 287,095 Afghanistan
  • 275,764 Congo, Democratic Republic
  • 262,847 Maldives
  • 237,418 Mayotte
  • 235,577 Suriname
  • 229,442 Cape Verde
  • 220,656 Guam
  • 187,025 Saint Lucia
  • 174,107 Antigua And Barbuda
  • 171,666 Rwanda
  • 169,416 Benin
  • 166,590 Andorra
  • 162,334 Laos
  • 145,130 Saint Vincent And Grenadines
  • 138,857 Burkina Faso
  • 136,498 Aruba
  • 123,952 Tajikistan
  • 121,132 Grenada
  • 107,290 Togo
  • 104,640 Malawi
  • 104,322 Djibouti
  • 102,047 Congo
  • 92,182 Mauritania
  • 88,486 Monaco
  • 87,158 Guinea
  • 86,626 Saint Kitts And Nevis
  • 84,232 Seychelles
  • 84,102 Bhutan
  • 84,078 Cayman Islands
  • 79,612 Mali
  • 72,750 Faroe Islands
  • 64,901 Virgin Islands, U.S.
  • 55,827 Gibraltar
  • 43,374 Niger
  • 21,690 Equatorial Guinea
Site explorer

473 million keywords

  • 150,126,015 United States
  • 25,056,686 Japan
  • 20,978,478 Germany
  • 20,183,605 United Kingdom
  • 19,986,170 France
  • 17,326,894 Brazil
  • 17,280,214 Canada
  • 16,327,059 Australia
  • 16,250,474 India
  • 13,685,692 Italy
  • 12,307,098 Russian Federation
  • 10,495,703 Spain
  • 10,162,869 Turkey
  • 9,416,152 Poland
  • 9,006,459 Mexico
  • 8,312,466 Indonesia
  • 5,939,291 Netherlands
  • 5,150,851 Ukraine
  • 4,871,276 Viet Nam
  • 4,757,988 Argentina
  • 4,027,196 Thailand
  • 3,760,266 Colombia
  • 3,497,049 Sweden
  • 2,979,608 Taiwan
  • 2,897,647 Philippines
  • 2,710,712 Chile
  • 2,401,846 Venezuela
  • 2,318,666 Austria
  • 2,184,554 Denmark
  • 2,128,505 Czech Republic
  • 1,980,331 Peru
  • 1,891,663 Israel
  • 1,888,875 Greece
  • 1,808,005 Belgium
  • 1,747,239 Egypt
  • 1,673,112 Hungary
  • 1,579,339 Pakistan
  • 1,555,453 Singapore
  • 1,526,794 Malaysia
  • 1,517,550 Norway
  • 1,456,675 Romania
  • 1,426,474 Hong Kong
  • 1,395,369 Korea
  • 1,340,620 Finland
  • 1,214,517 Portugal
  • 1,181,992 New Zealand
  • 1,181,250 South Africa
  • 1,140,755 Algeria
  • 1,109,094 Ecuador
  • 1,085,969 Saudi Arabia
  • 1,018,227 Switzerland
  • 944,557 Morocco
  • 826,185 Bulgaria
  • 754,500 Serbia
  • 741,925 Slovakia
  • 656,697 Ireland
  • 600,590 Croatia
  • 541,100 Kazakhstan
  • 518,433 Belarus
  • 504,045 United Arab Emirates
  • 411,879 Uruguay
  • 397,315 Bangladesh
  • 394,664 Bolivia
  • 393,671 Dominican Republic
  • 390,837 Tunisia
  • 390,137 Sri Lanka
  • 384,133 Lithuania
  • 348,885 Costa Rica
  • 335,819 Slovenia
  • 318,087 Guatemala
  • 313,384 Nigeria
  • 252,007 Iraq
  • 242,353 Azerbaijan
  • 237,596 Bosnia & Herzegovina
  • 226,118 Latvia
  • 224,764 Panama
  • 218,551 Kenya
  • 214,668 Estonia
  • 205,518 El Salvador
  • 186,365 Paraguay
  • 179,887 Jordan
  • 175,351 Moldova
  • 166,105 Puerto Rico
  • 159,263 Honduras
  • 155,753 Armenia
  • 150,954 Georgia
  • 116,322 Ghana
  • 114,554 Trinidad And Tobago
  • 114,298 Jamaica
  • 106,026 Palestinian Territory
  • 103,062 Qatar
  • 101,471 Macedonia
  • 100,279 Lebanon
  • 95,275 Kuwait
  • 93,906 Mauritius
  • 93,778 Nicaragua
  • 89,381 Nepal
  • 81,758 Albania
  • 76,418 Cyprus
  • 74,562 Oman
  • 70,555 Tanzania
  • 70,523 Cote D'Ivoire
  • 63,052 Malta
  • 56,888 Luxembourg
  • 56,341 Senegal
  • 56,130 Cameroon
  • 56,129 Kyrgyzstan
  • 53,989 Cambodia
  • 48,070 Angola
  • 47,440 Bahrain
  • 47,220 Libya
  • 46,381 Iceland
  • 43,820 Guadeloupe
  • 40,988 Zimbabwe
  • 39,915 Mozambique
  • 39,135 Montenegro
  • 37,712 Madagascar
  • 37,712 Mongolia
  • 34,703 Ethiopia
  • 24,057 Namibia
  • 23,923 Haiti
  • 22,775 Zambia
  • 20,096 Brunei Darussalam
  • 18,092 Fiji
  • 17,491 Afghanistan
  • 16,217 Bahamas
  • 15,993 Laos
  • 15,460 Guyana
  • 15,202 Suriname
  • 14,076 Congo, Democratic Republic
  • 13,838 Maldives
  • 13,698 Botswana
  • 13,036 Tajikistan
  • 13,021 Gabon
  • 11,402 Rwanda
  • 10,861 Belize
  • 10,098 Burkina Faso
  • 9,148 Congo
  • 8,853 Benin
  • 8,815 Cape Verde
  • 8,017 Mali
  • 7,193 Togo
  • 6,612 Saint Vincent And Grenadines
  • 6,336 Bhutan
  • 6,087 Andorra
  • 5,623 Antigua And Barbuda
  • 5,450 Niger
  • 5,170 Malawi
  • 4,431 Djibouti
  • 3,608 Virgin Islands, U.S.
  • 3,359 Seychelles
  • 3,032 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.

2,000 Servers

  • 65,000 CPU cores
  • 360TB RAM
  • 48PB HDD
  • 7PB SSD