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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
    983 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 (536 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

536 million keywords

  • 170,225,789 United States
  • 26,443,491 Japan
  • 23,131,652 France
  • 21,423,780 United Kingdom
  • 20,511,293 Germany
  • 18,485,921 India
  • 17,908,074 Brazil
  • 17,657,391 Canada
  • 16,573,514 Australia
  • 15,373,584 Italy
  • 14,409,595 Russian Federation
  • 12,075,143 Spain
  • 11,996,333 Mexico
  • 11,293,136 Turkey
  • 11,128,923 Poland
  • 9,276,787 Indonesia
  • 6,510,436 Argentina
  • 6,417,115 Netherlands
  • 6,066,837 Ukraine
  • 5,654,804 Viet Nam
  • 5,528,578 Colombia
  • 3,859,641 Sweden
  • 3,716,683 Taiwan
  • 3,506,210 Philippines
  • 3,082,407 Chile
  • 2,731,863 Thailand
  • 2,707,977 Venezuela
  • 2,626,399 Peru
  • 2,587,786 Austria
  • 2,559,884 Greece
  • 2,516,928 Czech Republic
  • 2,497,678 Belgium
  • 2,418,473 Denmark
  • 2,341,587 Hungary
  • 2,287,305 Egypt
  • 2,267,412 Pakistan
  • 2,202,632 Malaysia
  • 2,127,139 Romania
  • 2,065,968 Korea
  • 2,030,811 Israel
  • 1,897,062 Algeria
  • 1,854,859 Finland
  • 1,713,035 Saudi Arabia
  • 1,675,185 Norway
  • 1,670,189 South Africa
  • 1,669,621 Singapore
  • 1,650,465 Portugal
  • 1,623,512 Ecuador
  • 1,539,570 Hong Kong
  • 1,497,993 Morocco
  • 1,442,645 Switzerland
  • 1,222,788 New Zealand
  • 1,133,229 Bulgaria
  • 1,038,738 Serbia
  • 1,010,558 Slovakia
  • 843,631 Ireland
  • 837,088 Kazakhstan
  • 815,556 Croatia
  • 728,657 Belarus
  • 654,172 United Arab Emirates
  • 571,767 Tunisia
  • 558,966 Uruguay
  • 539,677 Bangladesh
  • 537,970 Dominican Republic
  • 522,741 Bolivia
  • 519,655 Sri Lanka
  • 505,607 Lithuania
  • 444,681 Costa Rica
  • 433,263 Slovenia
  • 396,597 Guatemala
  • 373,229 Nigeria
  • 345,098 Iraq
  • 321,164 Azerbaijan
  • 312,032 Bosnia & Herzegovina
  • 273,778 Latvia
  • 253,987 Panama
  • 240,301 El Salvador
  • 238,890 Estonia
  • 231,938 Kenya
  • 214,142 Moldova
  • 210,803 Paraguay
  • 203,987 Jordan
  • 186,961 Armenia
  • 184,462 Puerto Rico
  • 171,277 Georgia
  • 168,692 Honduras
  • 119,710 Trinidad And Tobago
  • 118,129 Jamaica
  • 117,484 Ghana
  • 106,754 Palestinian Territory
  • 105,840 Qatar
  • 105,489 Lebanon
  • 103,263 Macedonia
  • 102,688 Kuwait
  • 96,350 Nicaragua
  • 95,289 Mauritius
  • 88,223 Nepal
  • 83,027 Albania
  • 80,499 Cyprus
  • 75,248 Oman
  • 74,493 Tanzania
  • 70,377 Cote D'Ivoire
  • 63,431 Malta
  • 57,576 Luxembourg
  • 57,208 Cameroon
  • 56,569 Kyrgyzstan
  • 56,401 Senegal
  • 54,666 Cambodia
  • 48,220 Bahrain
  • 47,978 Angola
  • 47,345 Libya
  • 47,162 Iceland
  • 44,488 Guadeloupe
  • 40,542 Zimbabwe
  • 40,240 Montenegro
  • 39,972 Mozambique
  • 37,921 Madagascar
  • 37,862 Mongolia
  • 34,507 Ethiopia
  • 24,851 Haiti
  • 24,204 Namibia
  • 23,507 Zambia
  • 20,409 Brunei Darussalam
  • 18,401 Fiji
  • 17,687 Afghanistan
  • 17,078 Laos
  • 16,775 Bahamas
  • 15,640 Guyana
  • 15,501 Suriname
  • 14,141 Congo, Democratic Republic
  • 14,031 Botswana
  • 13,929 Maldives
  • 13,265 Gabon
  • 12,812 Tajikistan
  • 11,384 Rwanda
  • 11,321 Belize
  • 10,304 Burkina Faso
  • 9,177 Congo
  • 8,851 Cape Verde
  • 8,789 Benin
  • 8,550 Mali
  • 7,116 Togo
  • 6,617 Saint Vincent And Grenadines
  • 6,365 Bhutan
  • 6,180 Andorra
  • 5,709 Antigua And Barbuda
  • 5,434 Niger
  • 5,112 Malawi
  • 4,458 Djibouti
  • 3,646 Virgin Islands, U.S.
  • 3,355 Seychelles
  • 3,041 Gibraltar
  • 238 Martinique
  • 148 New Caledonia
  • 72 French Polynesia
  • 43 Mauritania
  • 33 Monaco
  • 30 Guam
  • 23 Saint Kitts And Nevis
  • 15 Guinea
  • 14 Reunion
  • 8 Faroe Islands
  • 7 Grenada
  • 5 Yemen
  • 3 Aruba
  • 2 Equatorial Guinea
  • 1 Mayotte

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