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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

  • 150,138,169 United States
  • 25,056,682 Japan
  • 20,978,775 Germany
  • 20,184,069 United Kingdom
  • 19,986,528 France
  • 17,326,402 Brazil
  • 17,280,236 Canada
  • 16,327,186 Australia
  • 16,251,989 India
  • 13,686,052 Italy
  • 12,307,211 Russian Federation
  • 10,495,949 Spain
  • 10,163,555 Turkey
  • 9,416,309 Poland
  • 9,006,492 Mexico
  • 8,312,553 Indonesia
  • 5,939,498 Netherlands
  • 5,151,000 Ukraine
  • 4,871,448 Viet Nam
  • 4,758,086 Argentina
  • 4,027,451 Thailand
  • 3,760,301 Colombia
  • 3,497,109 Sweden
  • 2,979,832 Taiwan
  • 2,912,562 Philippines
  • 2,719,247 Chile
  • 2,403,399 Venezuela
  • 2,321,269 Austria
  • 2,186,148 Denmark
  • 2,129,415 Czech Republic
  • 1,981,731 Peru
  • 1,895,577 Israel
  • 1,894,925 Greece
  • 1,819,158 Belgium
  • 1,754,895 Egypt
  • 1,676,413 Hungary
  • 1,583,007 Pakistan
  • 1,557,564 Singapore
  • 1,533,772 Malaysia
  • 1,521,012 Norway
  • 1,461,431 Romania
  • 1,434,946 Hong Kong
  • 1,408,552 Korea
  • 1,349,620 Finland
  • 1,219,113 Portugal
  • 1,189,325 South Africa
  • 1,184,063 New Zealand
  • 1,152,888 Algeria
  • 1,110,768 Ecuador
  • 1,097,819 Saudi Arabia
  • 1,016,875 Switzerland
  • 948,512 Morocco
  • 830,654 Bulgaria
  • 758,676 Serbia
  • 746,008 Slovakia
  • 662,246 Ireland
  • 604,811 Croatia
  • 542,791 Kazakhstan
  • 519,747 Belarus
  • 508,898 United Arab Emirates
  • 412,177 Uruguay
  • 399,930 Bangladesh
  • 396,441 Bolivia
  • 395,278 Dominican Republic
  • 392,337 Sri Lanka
  • 392,200 Tunisia
  • 387,754 Lithuania
  • 350,828 Costa Rica
  • 337,453 Slovenia
  • 319,480 Guatemala
  • 315,994 Nigeria
  • 254,858 Iraq
  • 243,704 Azerbaijan
  • 238,926 Bosnia & Herzegovina
  • 227,093 Latvia
  • 225,774 Panama
  • 219,408 Kenya
  • 215,991 Estonia
  • 206,424 El Salvador
  • 187,187 Paraguay
  • 180,981 Jordan
  • 175,651 Moldova
  • 166,403 Puerto Rico
  • 159,913 Honduras
  • 156,994 Armenia
  • 152,475 Georgia
  • 117,062 Ghana
  • 115,245 Trinidad And Tobago
  • 115,214 Jamaica
  • 107,190 Palestinian Territory
  • 103,111 Qatar
  • 102,384 Macedonia
  • 101,555 Lebanon
  • 96,323 Kuwait
  • 94,259 Mauritius
  • 94,128 Nicaragua
  • 89,955 Nepal
  • 82,382 Albania
  • 77,016 Cyprus
  • 74,452 Oman
  • 71,291 Tanzania
  • 70,984 Cote D'Ivoire
  • 63,254 Malta
  • 57,218 Luxembourg
  • 56,653 Senegal
  • 56,613 Cameroon
  • 56,369 Kyrgyzstan
  • 54,266 Cambodia
  • 48,276 Angola
  • 47,952 Bahrain
  • 47,368 Libya
  • 46,647 Iceland
  • 44,012 Guadeloupe
  • 41,336 Zimbabwe
  • 39,984 Mozambique
  • 39,374 Montenegro
  • 38,008 Mongolia
  • 37,873 Madagascar
  • 35,133 Ethiopia
  • 24,242 Namibia
  • 24,016 Haiti
  • 23,026 Zambia
  • 20,199 Brunei Darussalam
  • 18,226 Fiji
  • 17,340 Afghanistan
  • 16,390 Bahamas
  • 16,054 Laos
  • 15,595 Guyana
  • 15,309 Suriname
  • 14,208 Congo, Democratic Republic
  • 13,968 Maldives
  • 13,788 Botswana
  • 13,142 Gabon
  • 13,063 Tajikistan
  • 11,503 Rwanda
  • 10,939 Belize
  • 10,165 Burkina Faso
  • 9,196 Congo
  • 8,910 Benin
  • 8,877 Cape Verde
  • 8,090 Mali
  • 7,228 Togo
  • 6,649 Saint Vincent And Grenadines
  • 6,378 Bhutan
  • 6,106 Andorra
  • 5,665 Antigua And Barbuda
  • 5,458 Niger
  • 5,222 Malawi
  • 4,449 Djibouti
  • 3,612 Virgin Islands, U.S.
  • 3,361 Seychelles
  • 3,049 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