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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
    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

  • 150,265,977 United States
  • 25,056,682 Japan
  • 20,978,334 Germany
  • 20,184,069 United Kingdom
  • 19,986,505 France
  • 17,325,494 Brazil
  • 17,279,909 Canada
  • 16,327,102 Australia
  • 16,251,990 India
  • 13,686,029 Italy
  • 12,307,207 Russian Federation
  • 10,495,950 Spain
  • 10,163,529 Turkey
  • 9,416,312 Poland
  • 9,006,282 Mexico
  • 8,312,537 Indonesia
  • 5,939,447 Netherlands
  • 5,151,001 Ukraine
  • 4,871,412 Viet Nam
  • 4,758,087 Argentina
  • 4,027,446 Thailand
  • 3,760,301 Colombia
  • 3,497,110 Sweden
  • 2,979,927 Taiwan
  • 2,912,768 Philippines
  • 2,719,276 Chile
  • 2,403,426 Venezuela
  • 2,321,281 Austria
  • 2,186,162 Denmark
  • 2,129,433 Czech Republic
  • 1,981,783 Peru
  • 1,895,616 Israel
  • 1,895,003 Greece
  • 1,819,223 Belgium
  • 1,755,017 Egypt
  • 1,676,473 Hungary
  • 1,583,125 Pakistan
  • 1,557,588 Singapore
  • 1,533,869 Malaysia
  • 1,521,031 Norway
  • 1,461,519 Romania
  • 1,434,959 Hong Kong
  • 1,408,892 Korea
  • 1,349,687 Finland
  • 1,219,181 Portugal
  • 1,189,392 South Africa
  • 1,184,091 New Zealand
  • 1,152,995 Algeria
  • 1,110,806 Ecuador
  • 1,097,935 Saudi Arabia
  • 1,016,936 Switzerland
  • 948,591 Morocco
  • 830,722 Bulgaria
  • 758,747 Serbia
  • 746,044 Slovakia
  • 662,329 Ireland
  • 604,876 Croatia
  • 542,861 Kazakhstan
  • 519,760 Belarus
  • 509,017 United Arab Emirates
  • 412,197 Uruguay
  • 400,028 Bangladesh
  • 396,485 Bolivia
  • 395,335 Dominican Republic
  • 392,424 Sri Lanka
  • 392,264 Tunisia
  • 387,826 Lithuania
  • 350,864 Costa Rica
  • 337,500 Slovenia
  • 319,509 Guatemala
  • 316,070 Nigeria
  • 254,978 Iraq
  • 243,800 Azerbaijan
  • 238,979 Bosnia & Herzegovina
  • 227,135 Latvia
  • 225,806 Panama
  • 219,487 Kenya
  • 216,052 Estonia
  • 206,453 El Salvador
  • 187,219 Paraguay
  • 181,063 Jordan
  • 175,709 Moldova
  • 166,472 Puerto Rico
  • 159,949 Honduras
  • 157,048 Armenia
  • 152,577 Georgia
  • 117,120 Ghana
  • 115,298 Trinidad And Tobago
  • 115,271 Jamaica
  • 107,270 Palestinian Territory
  • 103,174 Qatar
  • 102,430 Macedonia
  • 101,640 Lebanon
  • 96,397 Kuwait
  • 94,297 Mauritius
  • 94,158 Nicaragua
  • 90,031 Nepal
  • 82,429 Albania
  • 77,075 Cyprus
  • 74,554 Oman
  • 71,363 Tanzania
  • 71,043 Cote D'Ivoire
  • 63,298 Malta
  • 57,261 Luxembourg
  • 56,695 Senegal
  • 56,659 Cameroon
  • 56,439 Kyrgyzstan
  • 54,329 Cambodia
  • 48,328 Angola
  • 48,016 Bahrain
  • 47,429 Libya
  • 46,679 Iceland
  • 44,033 Guadeloupe
  • 41,383 Zimbabwe
  • 40,011 Mozambique
  • 39,410 Montenegro
  • 38,074 Mongolia
  • 37,905 Madagascar
  • 35,212 Ethiopia
  • 24,273 Namibia
  • 24,049 Haiti
  • 23,075 Zambia
  • 20,225 Brunei Darussalam
  • 18,251 Fiji
  • 17,356 Afghanistan
  • 16,418 Bahamas
  • 16,078 Laos
  • 15,610 Guyana
  • 15,331 Suriname
  • 14,237 Congo, Democratic Republic
  • 13,993 Maldives
  • 13,808 Botswana
  • 13,165 Gabon
  • 13,092 Tajikistan
  • 11,518 Rwanda
  • 10,956 Belize
  • 10,183 Burkina Faso
  • 9,203 Congo
  • 8,924 Benin
  • 8,893 Cape Verde
  • 8,104 Mali
  • 7,232 Togo
  • 6,655 Saint Vincent And Grenadines
  • 6,386 Bhutan
  • 6,113 Andorra
  • 5,675 Antigua And Barbuda
  • 5,460 Niger
  • 5,230 Malawi
  • 4,458 Djibouti
  • 3,616 Virgin Islands, U.S.
  • 3,364 Seychelles
  • 3,053 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