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

  • 150,125,078 United States
  • 25,056,685 Japan
  • 20,978,477 Germany
  • 20,183,602 United Kingdom
  • 19,986,166 France
  • 17,326,888 Brazil
  • 17,280,219 Canada
  • 16,327,067 Australia
  • 16,250,473 India
  • 13,685,690 Italy
  • 12,307,096 Russian Federation
  • 10,495,712 Spain
  • 10,162,863 Turkey
  • 9,416,166 Poland
  • 9,006,469 Mexico
  • 8,312,423 Indonesia
  • 5,939,310 Netherlands
  • 5,150,856 Ukraine
  • 4,871,292 Viet Nam
  • 4,757,989 Argentina
  • 4,027,214 Thailand
  • 3,760,270 Colombia
  • 3,497,054 Sweden
  • 2,979,599 Taiwan
  • 2,897,644 Philippines
  • 2,710,711 Chile
  • 2,401,677 Venezuela
  • 2,318,664 Austria
  • 2,184,538 Denmark
  • 2,128,494 Czech Republic
  • 1,980,332 Peru
  • 1,891,481 Israel
  • 1,888,862 Greece
  • 1,808,000 Belgium
  • 1,747,242 Egypt
  • 1,673,105 Hungary
  • 1,579,337 Pakistan
  • 1,555,451 Singapore
  • 1,526,786 Malaysia
  • 1,517,546 Norway
  • 1,456,676 Romania
  • 1,426,474 Hong Kong
  • 1,395,372 Korea
  • 1,340,601 Finland
  • 1,214,517 Portugal
  • 1,181,995 New Zealand
  • 1,181,241 South Africa
  • 1,140,753 Algeria
  • 1,109,094 Ecuador
  • 1,085,958 Saudi Arabia
  • 1,018,228 Switzerland
  • 944,557 Morocco
  • 826,174 Bulgaria
  • 754,495 Serbia
  • 741,923 Slovakia
  • 656,698 Ireland
  • 600,591 Croatia
  • 541,095 Kazakhstan
  • 518,430 Belarus
  • 504,046 United Arab Emirates
  • 411,880 Uruguay
  • 397,315 Bangladesh
  • 394,664 Bolivia
  • 393,671 Dominican Republic
  • 390,838 Tunisia
  • 390,138 Sri Lanka
  • 384,131 Lithuania
  • 348,883 Costa Rica
  • 335,819 Slovenia
  • 318,088 Guatemala
  • 313,383 Nigeria
  • 252,009 Iraq
  • 242,352 Azerbaijan
  • 237,596 Bosnia & Herzegovina
  • 226,116 Latvia
  • 224,764 Panama
  • 218,553 Kenya
  • 214,668 Estonia
  • 205,517 El Salvador
  • 186,365 Paraguay
  • 179,888 Jordan
  • 175,350 Moldova
  • 166,106 Puerto Rico
  • 159,263 Honduras
  • 155,749 Armenia
  • 150,953 Georgia
  • 116,323 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
  • 70,556 Tanzania
  • 70,522 Cote D'Ivoire
  • 63,052 Malta
  • 56,888 Luxembourg
  • 56,341 Senegal
  • 56,130 Cameroon
  • 56,129 Kyrgyzstan
  • 53,989 Cambodia
  • 48,070 Angola
  • 47,441 Bahrain
  • 47,220 Libya
  • 46,381 Iceland
  • 43,820 Guadeloupe
  • 40,988 Zimbabwe
  • 39,915 Mozambique
  • 39,135 Montenegro
  • 37,712 Mongolia
  • 37,711 Madagascar
  • 34,704 Ethiopia
  • 24,057 Namibia
  • 23,923 Haiti
  • 22,775 Zambia
  • 20,096 Brunei Darussalam
  • 18,089 Fiji
  • 17,490 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