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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

  • 150,258,211 United States
  • 25,056,682 Japan
  • 20,978,486 Germany
  • 20,184,069 United Kingdom
  • 19,986,507 France
  • 17,325,683 Brazil
  • 17,279,974 Canada
  • 16,327,133 Australia
  • 16,251,990 India
  • 13,686,031 Italy
  • 12,307,207 Russian Federation
  • 10,495,950 Spain
  • 10,163,552 Turkey
  • 9,416,312 Poland
  • 9,006,325 Mexico
  • 8,312,537 Indonesia
  • 5,939,460 Netherlands
  • 5,151,001 Ukraine
  • 4,871,416 Viet Nam
  • 4,758,087 Argentina
  • 4,027,448 Thailand
  • 3,760,301 Colombia
  • 3,497,110 Sweden
  • 2,979,926 Taiwan
  • 2,912,758 Philippines
  • 2,719,275 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
  • 1,895,002 Greece
  • 1,819,215 Belgium
  • 1,755,007 Egypt
  • 1,676,473 Hungary
  • 1,583,120 Pakistan
  • 1,557,588 Singapore
  • 1,533,858 Malaysia
  • 1,521,031 Norway
  • 1,461,517 Romania
  • 1,434,959 Hong Kong
  • 1,408,875 Korea
  • 1,349,684 Finland
  • 1,219,181 Portugal
  • 1,189,392 South Africa
  • 1,184,090 New Zealand
  • 1,152,979 Algeria
  • 1,110,806 Ecuador
  • 1,097,927 Saudi Arabia
  • 1,016,936 Switzerland
  • 948,591 Morocco
  • 830,722 Bulgaria
  • 758,747 Serbia
  • 746,044 Slovakia
  • 662,329 Ireland
  • 604,876 Croatia
  • 542,860 Kazakhstan
  • 519,766 Belarus
  • 509,015 United Arab Emirates
  • 412,197 Uruguay
  • 400,030 Bangladesh
  • 396,485 Bolivia
  • 395,337 Dominican Republic
  • 392,426 Sri Lanka
  • 392,265 Tunisia
  • 387,831 Lithuania
  • 350,864 Costa Rica
  • 337,499 Slovenia
  • 319,510 Guatemala
  • 316,069 Nigeria
  • 254,977 Iraq
  • 243,800 Azerbaijan
  • 238,977 Bosnia & Herzegovina
  • 227,138 Latvia
  • 225,806 Panama
  • 219,486 Kenya
  • 216,051 Estonia
  • 206,453 El Salvador
  • 187,219 Paraguay
  • 181,063 Jordan
  • 175,706 Moldova
  • 166,471 Puerto Rico
  • 159,947 Honduras
  • 157,051 Armenia
  • 152,569 Georgia
  • 117,118 Ghana
  • 115,298 Trinidad And Tobago
  • 115,270 Jamaica
  • 107,269 Palestinian Territory
  • 103,172 Qatar
  • 102,430 Macedonia
  • 101,638 Lebanon
  • 96,394 Kuwait
  • 94,296 Mauritius
  • 94,157 Nicaragua
  • 90,028 Nepal
  • 82,427 Albania
  • 77,073 Cyprus
  • 74,550 Oman
  • 71,361 Tanzania
  • 71,041 Cote D'Ivoire
  • 63,297 Malta
  • 57,260 Luxembourg
  • 56,692 Senegal
  • 56,656 Cameroon
  • 56,434 Kyrgyzstan
  • 54,325 Cambodia
  • 48,325 Angola
  • 48,015 Bahrain
  • 47,425 Libya
  • 46,679 Iceland
  • 44,033 Guadeloupe
  • 41,379 Zimbabwe
  • 40,011 Mozambique
  • 39,408 Montenegro
  • 38,074 Mongolia
  • 37,903 Madagascar
  • 35,209 Ethiopia
  • 24,271 Namibia
  • 24,045 Haiti
  • 23,068 Zambia
  • 20,221 Brunei Darussalam
  • 18,249 Fiji
  • 17,355 Afghanistan
  • 16,416 Bahamas
  • 16,077 Laos
  • 15,609 Guyana
  • 15,330 Suriname
  • 14,236 Congo, Democratic Republic
  • 13,989 Maldives
  • 13,806 Botswana
  • 13,161 Gabon
  • 13,088 Tajikistan
  • 11,514 Rwanda
  • 10,956 Belize
  • 10,179 Burkina Faso
  • 9,203 Congo
  • 8,922 Benin
  • 8,890 Cape Verde
  • 8,102 Mali
  • 7,232 Togo
  • 6,654 Saint Vincent And Grenadines
  • 6,386 Bhutan
  • 6,113 Andorra
  • 5,673 Antigua And Barbuda
  • 5,460 Niger
  • 5,229 Malawi
  • 4,457 Djibouti
  • 3,615 Virgin Islands, U.S.
  • 3,364 Seychelles
  • 3,052 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