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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
    982 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (6.9 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (544 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

6.9 billion keywords

  • 2,831,565,412 United States
  • 487,959,458 Brazil
  • 326,514,035 France
  • 306,358,940 United Kingdom
  • 174,751,056 Germany
  • 170,275,693 Spain
  • 166,975,266 Poland
  • 149,421,511 Italy
  • 132,052,682 Russian Federation
  • 128,697,087 Mexico
  • 128,635,045 Canada
  • 111,293,123 Argentina
  • 104,771,105 Japan
  • 104,294,918 India
  • 97,340,827 Colombia
  • 93,310,404 Australia
  • 71,889,422 Ukraine
  • 56,192,422 Indonesia
  • 54,404,649 Chile
  • 52,630,134 Turkey
  • 46,945,553 Venezuela
  • 45,563,159 Czech Republic
  • 44,411,134 Philippines
  • 42,785,197 Netherlands
  • 41,399,008 Taiwan
  • 40,327,422 Belgium
  • 38,801,729 Peru
  • 34,682,882 Hungary
  • 34,296,191 Greece
  • 31,801,989 Ecuador
  • 28,326,867 Romania
  • 28,188,223 Finland
  • 26,107,902 Viet Nam
  • 25,722,371 Pakistan
  • 25,054,453 Portugal
  • 24,563,095 Sweden
  • 24,239,241 Egypt
  • 23,882,882 Malaysia
  • 22,607,403 Algeria
  • 21,982,040 Norway
  • 21,324,753 Morocco
  • 20,114,199 South Africa
  • 19,599,551 Austria
  • 19,542,549 New Zealand
  • 19,528,069 Thailand
  • 19,123,067 Korea
  • 18,057,824 Switzerland
  • 17,109,477 Serbia
  • 16,224,651 Slovakia
  • 16,108,888 Denmark
  • 16,023,219 Bulgaria
  • 14,583,297 Saudi Arabia
  • 13,146,386 Croatia
  • 12,648,663 Belarus
  • 12,620,733 Bolivia
  • 12,532,437 Hong Kong
  • 12,379,850 Israel
  • 12,163,209 Uruguay
  • 11,452,542 Ireland
  • 10,912,595 Singapore
  • 10,881,911 Tunisia
  • 10,518,173 Kazakhstan
  • 10,131,844 Dominican Republic
  • 9,518,059 Costa Rica
  • 8,237,305 Lithuania
  • 7,764,538 Slovenia
  • 7,281,679 Guatemala
  • 7,162,190 Sri Lanka
  • 6,994,180 Bangladesh
  • 6,401,229 United Arab Emirates
  • 5,909,929 Bosnia & Herzegovina
  • 5,858,089 Panama
  • 5,758,700 El Salvador
  • 5,682,894 Latvia
  • 5,445,009 Nigeria
  • 5,401,087 Paraguay
  • 5,217,524 Estonia
  • 4,952,441 Moldova
  • 4,289,770 Honduras
  • 3,534,001 Azerbaijan
  • 3,146,465 Armenia
  • 3,093,848 Kenya
  • 3,043,244 Puerto Rico
  • 2,776,887 Trinidad And Tobago
  • 2,638,855 Jordan
  • 2,597,870 Mauritius
  • 2,469,290 Reunion
  • 2,420,826 Nicaragua
  • 2,406,556 Macedonia
  • 2,326,900 Georgia
  • 2,298,979 Jamaica
  • 2,221,668 Iraq
  • 1,935,842 Palestinian Territory
  • 1,878,417 Ghana
  • 1,559,011 Malta
  • 1,518,548 Albania
  • 1,466,897 Qatar
  • 1,453,953 Cyprus
  • 1,446,480 Lebanon
  • 1,392,539 Nepal
  • 1,389,161 Zimbabwe
  • 1,311,028 Madagascar
  • 1,290,928 Luxembourg
  • 1,259,332 Cote D'Ivoire
  • 1,240,269 Cameroon
  • 1,236,087 Kuwait
  • 1,171,466 Oman
  • 1,041,875 Senegal
  • 1,001,271 Angola
  • 984,700 Iceland
  • 973,668 Montenegro
  • 958,681 Guadeloupe
  • 898,076 Martinique
  • 850,810 Yemen
  • 840,089 Cambodia
  • 825,009 Bahrain
  • 823,845 Tanzania
  • 769,240 Kyrgyzstan
  • 714,924 Mozambique
  • 696,975 New Caledonia
  • 681,260 Libya
  • 577,017 Mongolia
  • 525,397 Ethiopia
  • 464,183 Zambia
  • 447,894 Brunei Darussalam
  • 446,100 Namibia
  • 442,155 French Polynesia
  • 438,109 French Guiana
  • 434,410 Haiti
  • 409,888 Guyana
  • 408,250 Fiji
  • 312,589 Belize
  • 312,574 Botswana
  • 298,693 Bahamas
  • 280,088 Gabon
  • 272,061 Afghanistan
  • 256,793 Congo, Democratic Republic
  • 247,289 Maldives
  • 224,712 Mayotte
  • 218,744 Suriname
  • 214,862 Cape Verde
  • 203,233 Guam
  • 171,611 Saint Lucia
  • 161,188 Antigua And Barbuda
  • 157,562 Benin
  • 157,385 Andorra
  • 154,212 Rwanda
  • 147,721 Laos
  • 136,177 Saint Vincent And Grenadines
  • 128,733 Burkina Faso
  • 126,701 Aruba
  • 116,603 Tajikistan
  • 111,388 Grenada
  • 98,856 Djibouti
  • 98,482 Togo
  • 96,525 Congo
  • 96,081 Malawi
  • 87,868 Mauritania
  • 83,539 Monaco
  • 83,390 Guinea
  • 81,608 Saint Kitts And Nevis
  • 78,768 Cayman Islands
  • 78,175 Bhutan
  • 77,865 Seychelles
  • 73,756 Mali
  • 68,437 Faroe Islands
  • 61,447 Virgin Islands, U.S.
  • 52,127 Gibraltar
  • 40,854 Niger
  • 20,226 Equatorial Guinea
Site explorer

544 million keywords

  • 172,773,793 United States
  • 26,672,390 Japan
  • 23,339,563 France
  • 22,124,327 United Kingdom
  • 20,697,298 Germany
  • 18,639,484 India
  • 18,048,076 Brazil
  • 17,882,688 Canada
  • 16,851,413 Australia
  • 15,497,107 Italy
  • 14,525,526 Russian Federation
  • 12,271,636 Spain
  • 12,084,579 Mexico
  • 11,391,941 Turkey
  • 11,215,002 Poland
  • 9,347,596 Indonesia
  • 6,559,043 Argentina
  • 6,470,831 Netherlands
  • 6,119,524 Ukraine
  • 5,706,487 Viet Nam
  • 5,569,523 Colombia
  • 3,896,926 Sweden
  • 3,744,897 Taiwan
  • 3,532,112 Philippines
  • 3,105,024 Chile
  • 2,774,990 Thailand
  • 2,739,049 Venezuela
  • 2,645,059 Peru
  • 2,609,936 Austria
  • 2,578,775 Greece
  • 2,537,356 Czech Republic
  • 2,516,136 Belgium
  • 2,439,193 Denmark
  • 2,359,256 Hungary
  • 2,303,675 Egypt
  • 2,284,261 Pakistan
  • 2,219,575 Malaysia
  • 2,142,744 Romania
  • 2,081,573 Korea
  • 2,054,481 Israel
  • 1,910,922 Algeria
  • 1,868,201 Finland
  • 1,725,527 Saudi Arabia
  • 1,693,151 Norway
  • 1,687,279 South Africa
  • 1,684,329 Singapore
  • 1,662,751 Portugal
  • 1,634,859 Ecuador
  • 1,550,594 Hong Kong
  • 1,514,053 Morocco
  • 1,464,176 Switzerland
  • 1,236,529 New Zealand
  • 1,164,856 Bulgaria
  • 1,069,890 Serbia
  • 1,042,188 Slovakia
  • 871,295 Ireland
  • 869,284 Kazakhstan
  • 845,320 Croatia
  • 759,399 Belarus
  • 680,343 United Arab Emirates
  • 601,631 Tunisia
  • 589,528 Uruguay
  • 567,944 Bangladesh
  • 567,595 Dominican Republic
  • 551,249 Bolivia
  • 547,645 Sri Lanka
  • 534,005 Lithuania
  • 472,104 Costa Rica
  • 462,119 Slovenia
  • 425,237 Guatemala
  • 397,631 Nigeria
  • 372,504 Iraq
  • 347,111 Azerbaijan
  • 340,116 Bosnia & Herzegovina
  • 300,955 Latvia
  • 279,114 Panama
  • 267,390 El Salvador
  • 265,088 Estonia
  • 251,987 Kenya
  • 240,448 Moldova
  • 236,262 Paraguay
  • 227,602 Jordan
  • 213,180 Armenia
  • 208,407 Puerto Rico
  • 198,459 Georgia
  • 195,908 Honduras
  • 135,634 Ghana
  • 129,766 Trinidad And Tobago
  • 128,935 Jamaica
  • 128,155 Palestinian Territory
  • 126,828 Qatar
  • 119,140 Lebanon
  • 118,197 Macedonia
  • 115,567 Kuwait
  • 110,375 Nicaragua
  • 108,399 Mauritius
  • 100,719 Nepal
  • 97,646 Albania
  • 92,798 Oman
  • 88,435 Cyprus
  • 84,625 Cote D'Ivoire
  • 84,489 Tanzania
  • 71,482 Malta
  • 67,153 Kyrgyzstan
  • 66,524 Cameroon
  • 66,157 Senegal
  • 63,952 Luxembourg
  • 63,466 Cambodia
  • 58,996 Bahrain
  • 56,411 Angola
  • 54,654 Libya
  • 51,251 Iceland
  • 48,875 Guadeloupe
  • 47,522 Mozambique
  • 45,454 Montenegro
  • 44,351 Zimbabwe
  • 43,603 Mongolia
  • 42,690 Madagascar
  • 40,117 Ethiopia
  • 28,112 Haiti
  • 26,449 Zambia
  • 26,394 Namibia
  • 23,806 Brunei Darussalam
  • 21,860 Afghanistan
  • 19,451 Fiji
  • 19,091 Bahamas
  • 18,099 Guyana
  • 18,072 Laos
  • 16,610 Maldives
  • 16,573 Suriname
  • 16,398 Congo, Democratic Republic
  • 15,420 Botswana
  • 15,303 Tajikistan
  • 14,797 Gabon
  • 12,539 Belize
  • 12,204 Rwanda
  • 11,922 Burkina Faso
  • 10,232 Benin
  • 9,961 Congo
  • 9,858 Cape Verde
  • 9,404 Mali
  • 7,650 Togo
  • 7,211 Saint Vincent And Grenadines
  • 6,897 Bhutan
  • 6,841 Andorra
  • 6,088 Antigua And Barbuda
  • 5,795 Niger
  • 5,709 Malawi
  • 4,949 Djibouti
  • 4,134 Virgin Islands, U.S.
  • 3,620 Seychelles
  • 3,383 Gibraltar
  • 413 Martinique
  • 308 New Caledonia
  • 186 French Polynesia
  • 72 Mauritania
  • 60 Monaco
  • 53 Guam
  • 41 Saint Kitts And Nevis
  • 35 Reunion
  • 23 Grenada
  • 20 Faroe Islands
  • 20 Guinea
  • 11 Equatorial Guinea
  • 7 Yemen
  • 6 Aruba
  • 2 Mayotte
  • 1 French Guiana
  • 1 Cayman Islands

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.

2.5K Servers

  • 38,000 CPU cores
  • 256TB RAM
  • 25PB HDD
  • 2.5PB SSD