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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
    900 million pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (5.9 billion) is used for studying search patterns of internet users (via Keywords Explorer). The smaller one (529 million) is used for researching the search queries that websites rank for in organic search results (via Site Explorer).

Keywords explorer

5.9 billion keywords

  • 2,254,878,805 United States
  • 442,607,717 Brazil
  • 298,482,609 France
  • 260,711,937 United Kingdom
  • 153,125,802 Poland
  • 152,481,291 Germany
  • 151,290,698 Spain
  • 131,054,493 Italy
  • 122,637,949 Russian Federation
  • 116,174,178 Mexico
  • 110,016,182 Canada
  • 97,552,913 Argentina
  • 92,143,944 India
  • 89,369,561 Colombia
  • 88,457,036 Japan
  • 79,958,931 Australia
  • 65,515,317 Ukraine
  • 51,421,210 Indonesia
  • 48,734,326 Chile
  • 46,403,598 Turkey
  • 43,166,573 Venezuela
  • 40,321,795 Czech Republic
  • 39,529,530 Philippines
  • 37,292,767 Taiwan
  • 35,931,853 Belgium
  • 35,313,810 Netherlands
  • 34,824,480 Peru
  • 31,367,358 Hungary
  • 30,432,180 Greece
  • 28,718,217 Ecuador
  • 25,665,366 Romania
  • 25,592,223 Finland
  • 24,264,966 Viet Nam
  • 23,993,307 Pakistan
  • 21,950,885 Portugal
  • 21,679,291 Egypt
  • 21,514,253 Sweden
  • 21,291,820 Algeria
  • 21,273,329 Malaysia
  • 19,955,830 Norway
  • 19,620,692 Morocco
  • 17,415,030 Korea
  • 17,228,018 New Zealand
  • 17,130,367 Austria
  • 16,835,271 South Africa
  • 16,062,593 Switzerland
  • 15,397,687 Serbia
  • 14,665,303 Bulgaria
  • 14,588,621 Slovakia
  • 13,945,933 Denmark
  • 13,304,048 Saudi Arabia
  • 11,776,580 Croatia
  • 11,606,934 Belarus
  • 11,096,664 Bolivia
  • 10,768,578 Uruguay
  • 10,568,813 Hong Kong
  • 10,071,547 Tunisia
  • 9,939,942 Israel
  • 9,825,301 Kazakhstan
  • 9,568,665 Ireland
  • 9,546,707 Thailand
  • 9,148,524 Dominican Republic
  • 9,121,783 Singapore
  • 8,279,464 Costa Rica
  • 7,483,239 Lithuania
  • 7,053,812 Slovenia
  • 6,405,992 Sri Lanka
  • 6,313,850 Guatemala
  • 6,141,895 Bangladesh
  • 5,594,232 United Arab Emirates
  • 5,381,039 Bosnia & Herzegovina
  • 5,176,400 Latvia
  • 5,089,518 El Salvador
  • 4,916,399 Panama
  • 4,735,428 Paraguay
  • 4,690,756 Estonia
  • 4,622,811 Moldova
  • 4,560,826 Nigeria
  • 3,743,919 Honduras
  • 3,294,205 Azerbaijan
  • 2,946,858 Armenia
  • 2,658,007 Puerto Rico
  • 2,469,256 Kenya
  • 2,258,036 Jordan
  • 2,220,920 Reunion
  • 2,186,221 Iraq
  • 2,184,426 Nicaragua
  • 2,173,468 Mauritius
  • 2,161,375 Macedonia
  • 2,159,515 Trinidad And Tobago
  • 2,137,045 Georgia
  • 1,828,300 Palestinian Territory
  • 1,812,928 Jamaica
  • 1,579,713 Ghana
  • 1,344,769 Albania
  • 1,333,206 Malta
  • 1,272,190 Qatar
  • 1,171,624 Madagascar
  • 1,167,798 Cyprus
  • 1,165,580 Lebanon
  • 1,152,749 Nepal
  • 1,123,550 Luxembourg
  • 1,086,777 Cote D'Ivoire
  • 1,078,312 Cameroon
  • 1,029,810 Kuwait
  • 1,026,633 Oman
  • 904,498 Senegal
  • 887,172 Montenegro
  • 881,593 Iceland
  • 870,631 Angola
  • 862,158 Guadeloupe
  • 799,270 Martinique
  • 735,256 Yemen
  • 723,099 Cambodia
  • 716,679 Bahrain
  • 715,398 Zimbabwe
  • 700,196 Tanzania
  • 694,932 Kyrgyzstan
  • 636,577 New Caledonia
  • 628,485 Mozambique
  • 601,184 Libya
  • 522,021 Mongolia
  • 460,138 Ethiopia
  • 398,754 Brunei Darussalam
  • 398,705 French Polynesia
  • 396,639 French Guiana
  • 377,138 Zambia
  • 361,909 Namibia
  • 360,848 Guyana
  • 351,549 Haiti
  • 315,760 Fiji
  • 254,747 Botswana
  • 252,507 Belize
  • 251,713 Afghanistan
  • 249,796 Bahamas
  • 233,645 Gabon
  • 230,526 Congo, Democratic Republic
  • 221,395 Maldives
  • 203,111 Mayotte
  • 183,129 Cape Verde
  • 181,024 Suriname
  • 165,848 Guam
  • 143,807 Saint Lucia
  • 140,520 Andorra
  • 136,441 Benin
  • 129,303 Antigua And Barbuda
  • 126,993 Rwanda
  • 120,618 Saint Vincent And Grenadines
  • 112,913 Laos
  • 110,811 Burkina Faso
  • 109,142 Tajikistan
  • 105,237 Aruba
  • 96,739 Grenada
  • 91,079 Djibouti
  • 85,383 Congo
  • 83,330 Togo
  • 82,836 Malawi
  • 79,282 Guinea
  • 78,317 Mauritania
  • 74,970 Monaco
  • 72,168 Saint Kitts And Nevis
  • 68,971 Bhutan
  • 68,025 Cayman Islands
  • 66,624 Seychelles
  • 64,190 Mali
  • 61,635 Faroe Islands
  • 55,111 Virgin Islands, U.S.
  • 44,852 Gibraltar
  • 34,556 Niger
  • 17,886 Equatorial Guinea
Site explorer

529 million keywords

  • 169,387,678 United States
  • 25,507,706 Japan
  • 23,047,189 France
  • 20,189,485 Germany
  • 18,235,638 India
  • 18,088,516 United Kingdom
  • 17,662,050 Brazil
  • 17,272,465 Canada
  • 16,116,642 Australia
  • 15,155,046 Italy
  • 14,205,429 Russian Federation
  • 11,849,387 Mexico
  • 11,630,631 Spain
  • 11,129,434 Turkey
  • 10,973,503 Poland
  • 9,160,974 Indonesia
  • 6,428,071 Argentina
  • 6,311,810 Netherlands
  • 5,980,001 Ukraine
  • 5,545,268 Viet Nam
  • 5,469,402 Colombia
  • 3,791,409 Sweden
  • 3,655,127 Taiwan
  • 3,460,540 Philippines
  • 3,043,356 Chile
  • 2,673,714 Venezuela
  • 2,656,680 Thailand
  • 2,578,793 Peru
  • 2,547,972 Austria
  • 2,521,885 Greece
  • 2,485,169 Czech Republic
  • 2,464,475 Belgium
  • 2,382,683 Denmark
  • 2,311,530 Hungary
  • 2,243,010 Egypt
  • 2,224,396 Pakistan
  • 2,162,560 Malaysia
  • 2,096,923 Romania
  • 2,024,764 Korea
  • 1,984,743 Israel
  • 1,861,437 Algeria
  • 1,829,653 Finland
  • 1,682,696 Saudi Arabia
  • 1,642,667 Norway
  • 1,641,537 Singapore
  • 1,640,421 South Africa
  • 1,630,793 Portugal
  • 1,606,416 Ecuador
  • 1,506,505 Hong Kong
  • 1,476,531 Morocco
  • 1,438,804 Switzerland
  • 1,201,750 New Zealand
  • 1,141,631 Bulgaria
  • 1,052,901 Serbia
  • 1,024,002 Slovakia
  • 866,521 Kazakhstan
  • 862,462 Ireland
  • 840,086 Croatia
  • 760,167 Belarus
  • 680,430 United Arab Emirates
  • 612,200 Tunisia
  • 604,027 Uruguay
  • 581,326 Dominican Republic
  • 576,016 Bangladesh
  • 564,989 Bolivia
  • 559,238 Sri Lanka
  • 547,712 Lithuania
  • 488,165 Costa Rica
  • 480,872 Slovenia
  • 443,790 Guatemala
  • 413,541 Nigeria
  • 403,244 Iraq
  • 367,599 Azerbaijan
  • 363,406 Bosnia & Herzegovina
  • 324,266 Latvia
  • 300,324 Panama
  • 291,409 El Salvador
  • 287,941 Estonia
  • 267,250 Kenya
  • 265,577 Moldova
  • 260,450 Paraguay
  • 247,761 Jordan
  • 237,036 Armenia
  • 231,284 Puerto Rico
  • 225,556 Georgia
  • 223,818 Honduras
  • 153,213 Palestinian Territory
  • 151,876 Qatar
  • 150,941 Ghana
  • 145,644 Macedonia
  • 139,030 Nicaragua
  • 137,383 Jamaica
  • 136,981 Trinidad And Tobago
  • 132,575 Lebanon
  • 126,684 Kuwait
  • 119,939 Mauritius
  • 115,037 Albania
  • 114,875 Oman
  • 112,070 Nepal
  • 97,197 Cote D'Ivoire
  • 93,971 Cyprus
  • 93,842 Tanzania
  • 80,363 Malta
  • 79,404 Cameroon
  • 78,520 Kyrgyzstan
  • 77,983 Senegal
  • 77,310 Luxembourg
  • 75,044 Cambodia
  • 68,154 Bahrain
  • 65,079 Libya
  • 64,761 Angola
  • 62,945 Iceland
  • 59,181 Mozambique
  • 55,840 Montenegro
  • 55,754 Guadeloupe
  • 52,182 Zimbabwe
  • 52,139 Mongolia
  • 51,413 Madagascar
  • 48,384 Ethiopia
  • 31,067 Haiti
  • 29,091 Zambia
  • 27,910 Brunei Darussalam
  • 27,712 Namibia
  • 26,105 Afghanistan
  • 20,681 Guyana
  • 20,638 Bahamas
  • 20,066 Congo, Democratic Republic
  • 19,657 Fiji
  • 18,844 Maldives
  • 18,748 Laos
  • 17,905 Tajikistan
  • 17,258 Suriname
  • 16,207 Botswana
  • 15,980 Gabon
  • 13,128 Belize
  • 12,902 Burkina Faso
  • 12,456 Rwanda
  • 11,209 Benin
  • 10,760 Congo
  • 10,637 Cape Verde
  • 10,046 Mali
  • 7,906 Togo
  • 7,607 Saint Vincent And Grenadines
  • 7,370 Andorra
  • 7,206 Bhutan
  • 6,203 Antigua And Barbuda
  • 6,152 Malawi
  • 6,057 Niger
  • 5,449 Djibouti
  • 4,675 Virgin Islands, U.S.
  • 3,726 Seychelles
  • 3,564 Gibraltar
  • 5 New Caledonia
  • 2 Mauritania
  • 1 Monaco

Backlink index

Ahrefs boasts the world's largest index of live backlinks that is updated with fresh data every 15-30 minutes. We use this backlink data to calculate our proprietary metrics: Ahrefs Rank, Domain Rating & URL Rating.

Domains (POST-VETTING)
Pages in index
Internal backlinks
External backlinks

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

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