We're hiring data scientist!

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
    904 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (5.7 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (540 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

5.7 billion keywords

  • 2,191,948,508 United States
  • 432,129,591 Brazil
  • 291,058,935 France
  • 257,799,844 United Kingdom
  • 150,251,852 Poland
  • 149,328,299 Germany
  • 147,247,696 Spain
  • 128,417,447 Italy
  • 120,155,702 Russian Federation
  • 113,513,007 Mexico
  • 107,851,947 Canada
  • 95,346,708 Argentina
  • 90,241,870 India
  • 86,796,974 Colombia
  • 85,444,437 Japan
  • 78,237,190 Australia
  • 63,655,578 Ukraine
  • 50,366,354 Indonesia
  • 47,365,744 Chile
  • 45,580,921 Turkey
  • 42,071,219 Venezuela
  • 39,363,765 Czech Republic
  • 38,676,977 Philippines
  • 36,164,253 Taiwan
  • 34,900,981 Belgium
  • 34,325,603 Netherlands
  • 33,742,290 Peru
  • 30,547,612 Hungary
  • 29,800,367 Greece
  • 28,015,417 Ecuador
  • 25,028,927 Finland
  • 25,021,610 Romania
  • 23,865,036 Viet Nam
  • 23,371,604 Pakistan
  • 21,433,429 Portugal
  • 21,192,514 Egypt
  • 20,879,783 Sweden
  • 20,813,440 Algeria
  • 20,739,274 Malaysia
  • 19,689,760 Norway
  • 19,120,775 Morocco
  • 16,994,178 New Zealand
  • 16,939,894 Korea
  • 16,673,502 Austria
  • 16,423,007 South Africa
  • 15,627,266 Switzerland
  • 15,036,035 Serbia
  • 14,371,052 Bulgaria
  • 14,195,035 Slovakia
  • 13,562,035 Denmark
  • 13,013,856 Saudi Arabia
  • 11,521,515 Croatia
  • 11,356,167 Belarus
  • 10,814,460 Bolivia
  • 10,467,013 Uruguay
  • 10,217,862 Hong Kong
  • 9,810,546 Tunisia
  • 9,642,319 Israel
  • 9,556,614 Kazakhstan
  • 9,274,230 Thailand
  • 9,268,342 Ireland
  • 8,895,925 Dominican Republic
  • 8,855,665 Singapore
  • 8,051,284 Costa Rica
  • 7,277,302 Lithuania
  • 6,864,675 Slovenia
  • 6,250,905 Sri Lanka
  • 6,082,642 Guatemala
  • 5,952,766 Bangladesh
  • 5,430,203 United Arab Emirates
  • 5,271,285 Bosnia & Herzegovina
  • 5,057,670 Latvia
  • 4,957,329 El Salvador
  • 4,773,949 Panama
  • 4,601,905 Paraguay
  • 4,565,717 Estonia
  • 4,535,745 Moldova
  • 4,425,113 Nigeria
  • 3,635,258 Honduras
  • 3,216,455 Azerbaijan
  • 2,882,426 Armenia
  • 2,595,055 Puerto Rico
  • 2,371,624 Kenya
  • 2,193,368 Jordan
  • 2,148,802 Reunion
  • 2,133,540 Nicaragua
  • 2,132,779 Iraq
  • 2,114,047 Macedonia
  • 2,109,386 Mauritius
  • 2,092,493 Trinidad And Tobago
  • 2,075,391 Georgia
  • 1,788,141 Palestinian Territory
  • 1,762,156 Jamaica
  • 1,531,712 Ghana
  • 1,312,445 Albania
  • 1,296,259 Malta
  • 1,242,855 Qatar
  • 1,138,798 Madagascar
  • 1,134,389 Lebanon
  • 1,133,819 Cyprus
  • 1,102,101 Nepal
  • 1,089,123 Luxembourg
  • 1,059,743 Cote D'Ivoire
  • 1,044,666 Cameroon
  • 1,006,078 Kuwait
  • 996,562 Oman
  • 881,531 Senegal
  • 862,648 Montenegro
  • 852,520 Iceland
  • 847,942 Angola
  • 838,021 Guadeloupe
  • 772,555 Martinique
  • 719,847 Yemen
  • 703,310 Cambodia
  • 696,212 Bahrain
  • 692,623 Zimbabwe
  • 682,459 Tanzania
  • 675,571 Kyrgyzstan
  • 617,033 New Caledonia
  • 612,070 Mozambique
  • 575,758 Libya
  • 504,080 Mongolia
  • 445,731 Ethiopia
  • 387,963 French Polynesia
  • 386,065 French Guiana
  • 383,560 Brunei Darussalam
  • 363,680 Zambia
  • 349,975 Namibia
  • 348,243 Guyana
  • 341,439 Haiti
  • 302,284 Fiji
  • 245,845 Botswana
  • 245,156 Belize
  • 244,383 Afghanistan
  • 242,669 Bahamas
  • 226,356 Gabon
  • 223,288 Congo, Democratic Republic
  • 214,168 Maldives
  • 197,192 Mayotte
  • 177,574 Cape Verde
  • 174,611 Suriname
  • 159,507 Guam
  • 138,880 Saint Lucia
  • 135,972 Andorra
  • 131,919 Benin
  • 126,120 Antigua And Barbuda
  • 121,389 Rwanda
  • 117,007 Saint Vincent And Grenadines
  • 109,268 Laos
  • 108,245 Burkina Faso
  • 106,788 Tajikistan
  • 101,809 Aruba
  • 93,389 Grenada
  • 88,402 Djibouti
  • 82,996 Congo
  • 80,182 Malawi
  • 80,181 Togo
  • 78,032 Guinea
  • 76,696 Mauritania
  • 72,142 Monaco
  • 69,835 Saint Kitts And Nevis
  • 66,681 Bhutan
  • 66,138 Cayman Islands
  • 64,610 Seychelles
  • 62,124 Mali
  • 59,523 Faroe Islands
  • 53,319 Virgin Islands, U.S.
  • 43,313 Gibraltar
  • 33,737 Niger
  • 17,131 Equatorial Guinea
Site explorer

540 million keywords

  • 171,574,258 United States
  • 25,911,949 Japan
  • 23,571,009 France
  • 21,185,037 Germany
  • 20,856,733 United Kingdom
  • 18,468,936 Brazil
  • 18,427,070 India
  • 17,159,420 Canada
  • 15,971,166 Italy
  • 15,002,817 Russian Federation
  • 14,886,098 Australia
  • 11,876,578 Spain
  • 11,850,018 Mexico
  • 11,777,257 Turkey
  • 11,617,139 Poland
  • 8,541,613 Indonesia
  • 6,599,321 Argentina
  • 6,507,409 Netherlands
  • 6,132,194 Ukraine
  • 5,884,777 Viet Nam
  • 5,500,743 Colombia
  • 3,939,544 Sweden
  • 3,665,386 Taiwan
  • 3,475,759 Philippines
  • 3,065,587 Chile
  • 2,683,786 Venezuela
  • 2,668,168 Thailand
  • 2,644,807 Austria
  • 2,596,409 Peru
  • 2,543,269 Czech Republic
  • 2,531,255 Greece
  • 2,487,205 Belgium
  • 2,438,139 Denmark
  • 2,322,264 Hungary
  • 2,263,616 Egypt
  • 2,247,489 Pakistan
  • 2,174,088 Malaysia
  • 2,106,375 Romania
  • 2,045,141 Israel
  • 2,037,285 Korea
  • 1,879,165 Algeria
  • 1,840,991 Finland
  • 1,696,242 Saudi Arabia
  • 1,692,067 Singapore
  • 1,691,571 South Africa
  • 1,671,768 Norway
  • 1,637,416 Portugal
  • 1,616,718 Ecuador
  • 1,508,131 Hong Kong
  • 1,485,143 Morocco
  • 1,449,711 Switzerland
  • 1,201,004 New Zealand
  • 1,154,327 Bulgaria
  • 1,056,989 Serbia
  • 1,029,974 Slovakia
  • 873,158 Kazakhstan
  • 868,764 Ireland
  • 844,721 Croatia
  • 764,108 Belarus
  • 701,193 United Arab Emirates
  • 616,068 Tunisia
  • 609,034 Uruguay
  • 586,037 Dominican Republic
  • 582,811 Bangladesh
  • 571,410 Bolivia
  • 562,063 Sri Lanka
  • 550,540 Lithuania
  • 491,132 Costa Rica
  • 483,250 Slovenia
  • 446,157 Guatemala
  • 415,676 Nigeria
  • 412,895 Iraq
  • 372,432 Azerbaijan
  • 367,085 Bosnia & Herzegovina
  • 326,282 Latvia
  • 301,611 Panama
  • 293,159 El Salvador
  • 290,235 Estonia
  • 271,800 Kenya
  • 266,723 Moldova
  • 262,058 Paraguay
  • 249,312 Jordan
  • 239,229 Armenia
  • 233,109 Puerto Rico
  • 226,455 Georgia
  • 225,640 Honduras
  • 154,330 Palestinian Territory
  • 153,056 Qatar
  • 151,722 Ghana
  • 146,451 Macedonia
  • 140,006 Nicaragua
  • 138,040 Jamaica
  • 137,381 Trinidad And Tobago
  • 134,201 Lebanon
  • 128,423 Kuwait
  • 120,501 Mauritius
  • 117,346 Oman
  • 116,556 Albania
  • 112,663 Nepal
  • 97,533 Cote D'Ivoire
  • 94,566 Cyprus
  • 94,509 Tanzania
  • 80,899 Malta
  • 79,661 Cameroon
  • 79,288 Kyrgyzstan
  • 78,636 Luxembourg
  • 78,453 Senegal
  • 76,047 Cambodia
  • 69,551 Bahrain
  • 65,865 Libya
  • 65,484 Angola
  • 63,635 Iceland
  • 59,596 Mozambique
  • 56,579 Montenegro
  • 56,169 Guadeloupe
  • 53,903 Zimbabwe
  • 52,510 Mongolia
  • 51,707 Madagascar
  • 48,762 Ethiopia
  • 31,221 Haiti
  • 30,384 Zambia
  • 28,315 Brunei Darussalam
  • 27,890 Namibia
  • 26,573 Afghanistan
  • 22,573 Martinique
  • 20,833 Bahamas
  • 20,792 Guyana
  • 20,265 Congo, Democratic Republic
  • 19,712 Fiji
  • 19,364 Maldives
  • 18,858 Laos
  • 18,043 Tajikistan
  • 17,348 Suriname
  • 16,338 Botswana
  • 16,059 Gabon
  • 15,968 New Caledonia
  • 13,207 Belize
  • 13,133 Burkina Faso
  • 12,507 Rwanda
  • 11,358 Benin
  • 10,817 Congo
  • 10,707 Cape Verde
  • 10,102 Mali
  • 8,937 French Polynesia
  • 7,983 Saint Vincent And Grenadines
  • 7,942 Togo
  • 7,490 Andorra
  • 7,194 Bhutan
  • 6,288 Antigua And Barbuda
  • 6,207 Malawi
  • 6,098 Niger
  • 5,511 Djibouti
  • 4,954 Virgin Islands, U.S.
  • 3,776 Mauritania
  • 3,745 Seychelles
  • 3,617 Gibraltar
  • 3,146 Guam
  • 2,924 Monaco
  • 2,173 Saint Kitts And Nevis
  • 1,531 Guinea
  • 1,515 Reunion
  • 1,074 Grenada
  • 770 Faroe Islands
  • 460 Aruba
  • 417 Yemen
  • 409 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