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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
    5 million new pages
  • Every 24 hours we update metrics for
    72 million pages
  • Total content index size
    790 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (5.3 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (503 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

5.3 billion keywords

  • 1,983,654,312 United States
  • 401,299,524 Brazil
  • 265,802,338 France
  • 245,990,024 United Kingdom
  • 137,270,656 Poland
  • 135,331,399 Germany
  • 134,338,804 Spain
  • 116,786,552 Italy
  • 109,648,457 Russian Federation
  • 104,033,707 Mexico
  • 101,026,401 Canada
  • 87,948,728 Argentina
  • 82,883,228 India
  • 80,872,960 Colombia
  • 78,577,568 Japan
  • 74,195,236 Australia
  • 57,080,891 Ukraine
  • 45,682,248 Indonesia
  • 43,993,570 Chile
  • 42,215,665 Turkey
  • 38,900,619 Venezuela
  • 35,143,698 Czech Republic
  • 35,012,440 Philippines
  • 32,680,227 Taiwan
  • 31,359,706 Belgium
  • 31,329,597 Peru
  • 31,025,761 Netherlands
  • 27,726,382 Hungary
  • 26,991,758 Greece
  • 25,815,921 Ecuador
  • 22,738,324 Romania
  • 22,681,005 Finland
  • 22,006,344 Viet Nam
  • 21,529,959 Pakistan
  • 19,472,954 Egypt
  • 19,370,611 Portugal
  • 19,282,691 Algeria
  • 18,764,429 Norway
  • 18,730,991 Malaysia
  • 18,575,371 Sweden
  • 17,559,127 Morocco
  • 16,023,203 New Zealand
  • 15,229,679 Korea
  • 14,909,880 Austria
  • 14,900,876 South Africa
  • 13,835,114 Switzerland
  • 13,567,781 Serbia
  • 13,039,039 Bulgaria
  • 12,826,286 Slovakia
  • 11,899,802 Saudi Arabia
  • 11,844,951 Denmark
  • 10,380,984 Croatia
  • 10,245,478 Belarus
  • 9,924,589 Bolivia
  • 9,683,209 Uruguay
  • 9,009,330 Tunisia
  • 8,920,895 Hong Kong
  • 8,705,175 Kazakhstan
  • 8,530,326 Israel
  • 8,351,858 Ireland
  • 8,236,502 Thailand
  • 8,199,371 Dominican Republic
  • 7,661,534 Singapore
  • 7,470,309 Costa Rica
  • 6,597,049 Lithuania
  • 6,183,393 Slovenia
  • 5,714,525 Sri Lanka
  • 5,538,709 Guatemala
  • 5,386,364 Bangladesh
  • 4,943,957 United Arab Emirates
  • 4,775,081 Bosnia & Herzegovina
  • 4,548,611 Latvia
  • 4,534,975 El Salvador
  • 4,407,776 Panama
  • 4,256,233 Paraguay
  • 4,107,819 Moldova
  • 4,056,610 Estonia
  • 4,010,389 Nigeria
  • 3,308,491 Honduras
  • 2,976,345 Azerbaijan
  • 2,663,336 Armenia
  • 2,431,035 Puerto Rico
  • 2,108,697 Kenya
  • 2,004,763 Jordan
  • 1,968,155 Iraq
  • 1,960,795 Nicaragua
  • 1,924,637 Mauritius
  • 1,919,273 Reunion
  • 1,903,508 Macedonia
  • 1,897,378 Trinidad And Tobago
  • 1,891,140 Georgia
  • 1,645,587 Palestinian Territory
  • 1,582,759 Jamaica
  • 1,388,021 Ghana
  • 1,181,780 Albania
  • 1,160,258 Malta
  • 1,129,548 Qatar
  • 1,023,208 Cyprus
  • 1,018,183 Madagascar
  • 1,010,988 Lebanon
  • 972,543 Luxembourg
  • 965,541 Nepal
  • 957,316 Cote D'Ivoire
  • 940,165 Cameroon
  • 915,551 Kuwait
  • 912,228 Oman
  • 795,994 Senegal
  • 779,423 Montenegro
  • 771,673 Angola
  • 761,888 Iceland
  • 746,909 Guadeloupe
  • 692,331 Martinique
  • 654,620 Yemen
  • 636,558 Bahrain
  • 627,401 Tanzania
  • 615,819 Zimbabwe
  • 614,060 Cambodia
  • 604,170 Kyrgyzstan
  • 568,520 Mozambique
  • 556,551 New Caledonia
  • 500,591 Libya
  • 448,519 Mongolia
  • 390,791 Ethiopia
  • 370,145 Barbados
  • 345,493 French Guiana
  • 342,486 French Polynesia
  • 340,925 Brunei Darussalam
  • 326,800 Zambia
  • 318,171 Namibia
  • 315,092 Guyana
  • 310,542 Haiti
  • 271,574 Fiji
  • 221,867 Botswana
  • 221,733 Afghanistan
  • 219,735 Belize
  • 215,275 Bahamas
  • 204,960 Gabon
  • 203,569 Congo, Democratic Republic
  • 194,216 Maldives
  • 174,382 Mayotte
  • 160,491 Cape Verde
  • 157,251 Suriname
  • 139,238 Guam
  • 121,385 Saint Lucia
  • 120,812 Andorra
  • 117,492 Benin
  • 112,843 Antigua And Barbuda
  • 106,190 Rwanda
  • 103,902 Saint Vincent And Grenadines
  • 97,455 Burkina Faso
  • 96,974 Tajikistan
  • 96,803 Laos
  • 90,740 Aruba
  • 83,280 Grenada
  • 80,477 Djibouti
  • 73,107 Guinea
  • 73,057 Congo
  • 71,471 Togo
  • 70,697 Malawi
  • 69,933 Mauritania
  • 63,463 Monaco
  • 62,121 Saint Kitts And Nevis
  • 60,372 Bhutan
  • 58,412 Cayman Islands
  • 57,597 Seychelles
  • 56,364 Mali
  • 52,670 Faroe Islands
  • 48,103 Virgin Islands, U.S.
  • 38,243 Gibraltar
  • 30,967 Niger
  • 15,485 Equatorial Guinea
Site explorer

503 million keywords

  • 156,366,045 United States
  • 22,973,246 France
  • 21,724,541 Japan
  • 20,463,000 United Kingdom
  • 20,443,610 Germany
  • 18,087,700 India
  • 16,826,855 Brazil
  • 16,447,743 Canada
  • 15,394,875 Italy
  • 14,563,000 Australia
  • 12,508,910 Russian Federation
  • 11,486,941 Spain
  • 11,303,375 Turkey
  • 11,302,185 Poland
  • 11,274,082 Mexico
  • 8,108,291 Indonesia
  • 6,483,261 Netherlands
  • 6,292,406 Argentina
  • 5,716,499 Viet Nam
  • 5,407,264 Colombia
  • 4,964,290 Ukraine
  • 3,524,597 Taiwan
  • 3,362,552 Philippines
  • 3,227,708 Sweden
  • 2,963,985 Chile
  • 2,601,186 Venezuela
  • 2,581,185 Thailand
  • 2,504,378 Peru
  • 2,417,664 Greece
  • 2,384,668 Belgium
  • 2,224,141 Austria
  • 2,215,709 Hungary
  • 2,171,993 Pakistan
  • 2,164,304 Egypt
  • 2,112,707 Malaysia
  • 2,091,012 Denmark
  • 2,029,238 Czech Republic
  • 2,016,881 Romania
  • 1,965,753 Korea
  • 1,814,979 Algeria
  • 1,761,263 Finland
  • 1,729,318 Israel
  • 1,643,179 Saudi Arabia
  • 1,626,948 South Africa
  • 1,587,239 Portugal
  • 1,574,010 Ecuador
  • 1,426,816 Morocco
  • 1,389,541 Switzerland
  • 1,338,713 Hong Kong
  • 1,278,937 Singapore
  • 1,257,286 Norway
  • 1,111,968 Bulgaria
  • 1,058,002 New Zealand
  • 1,010,360 Serbia
  • 980,391 Slovakia
  • 841,235 Kazakhstan
  • 839,242 Ireland
  • 808,061 Croatia
  • 732,682 Belarus
  • 684,303 United Arab Emirates
  • 593,461 Tunisia
  • 579,852 Uruguay
  • 568,499 Dominican Republic
  • 560,256 Bangladesh
  • 556,223 Bolivia
  • 542,036 Sri Lanka
  • 528,525 Lithuania
  • 476,406 Costa Rica
  • 461,421 Slovenia
  • 437,684 Guatemala
  • 402,146 Nigeria
  • 398,674 Iraq
  • 358,390 Azerbaijan
  • 354,220 Bosnia & Herzegovina
  • 313,190 Latvia
  • 294,544 Panama
  • 285,622 El Salvador
  • 277,101 Estonia
  • 265,936 Kenya
  • 255,864 Moldova
  • 253,490 Paraguay
  • 242,712 Jordan
  • 230,717 Armenia
  • 229,924 Puerto Rico
  • 220,420 Honduras
  • 218,911 Georgia
  • 148,710 Palestinian Territory
  • 147,367 Qatar
  • 145,787 Ghana
  • 140,200 Macedonia
  • 136,612 Nicaragua
  • 132,257 Jamaica
  • 131,835 Trinidad And Tobago
  • 130,057 Lebanon
  • 123,790 Kuwait
  • 115,773 Mauritius
  • 113,961 Oman
  • 112,025 Albania
  • 106,328 Nepal
  • 93,865 Cote D'Ivoire
  • 91,221 Tanzania
  • 91,003 Cyprus
  • 77,589 Malta
  • 76,430 Cameroon
  • 76,018 Kyrgyzstan
  • 75,671 Senegal
  • 74,526 Luxembourg
  • 72,747 Cambodia
  • 68,032 Bahrain
  • 63,580 Angola
  • 62,953 Libya
  • 60,869 Iceland
  • 57,934 Mozambique
  • 54,050 Guadeloupe
  • 53,499 Montenegro
  • 53,408 Zimbabwe
  • 50,577 Mongolia
  • 49,395 Madagascar
  • 46,881 Ethiopia
  • 30,143 Haiti
  • 30,128 Zambia
  • 27,001 Namibia
  • 26,912 Brunei Darussalam
  • 26,048 Afghanistan
  • 22,581 Martinique
  • 20,048 Bahamas
  • 19,788 Guyana
  • 19,610 Congo, Democratic Republic
  • 18,802 Fiji
  • 18,437 Maldives
  • 17,828 Laos
  • 17,556 Tajikistan
  • 16,719 Suriname
  • 15,973 New Caledonia
  • 15,649 Botswana
  • 15,447 Gabon
  • 12,895 Burkina Faso
  • 12,657 Belize
  • 11,883 Rwanda
  • 11,067 Benin
  • 10,381 Congo
  • 10,297 Cape Verde
  • 9,790 Mali
  • 8,943 French Polynesia
  • 8,301 Saint Vincent And Grenadines
  • 7,749 Togo
  • 7,242 Andorra
  • 6,899 Bhutan
  • 6,043 Antigua And Barbuda
  • 6,036 Malawi
  • 5,987 Niger
  • 5,401 Djibouti
  • 5,224 Virgin Islands, U.S.
  • 3,967 Barbados
  • 3,777 Mauritania
  • 3,657 Seychelles
  • 3,619 Gibraltar
  • 3,148 Guam
  • 2,928 Monaco
  • 2,174 Saint Kitts And Nevis
  • 1,531 Guinea
  • 1,516 Reunion
  • 1,075 Grenada
  • 770 Faroe Islands
  • 460 Aruba
  • 417 Yemen
  • 410 Equatorial Guinea
  • 85 Mayotte
  • 18 Cayman Islands
  • 9 Saint Lucia
  • 5 French Guiana

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