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Bringing Big Data to SEO Professionals - Ahrefs

Ahrefs by the numbers

The 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 largest third-party database of search queries, with estimated monthly search volume and advanced keyword research metrics.

Explore the scale of data that powers Ahrefs marketing tools:

Content index

Our content index powers Content Explorer. Search for any word or phrase and we return useful SEO and social metrics for all relevant pages.

  • Every 24 hours we discover
    1.8 million new pages
  • Every 24 hours we update metrics for
    72 million pages
  • Total content index size
    1.1 billion pages
  • Full update
    Every month

Keyword indexes

We operate two independent keyword indexes. The larger one (7.5 billion) powers Keywords Explorer, which you can use to study internet users' search patterns. The smaller one (473 million) powers Site Explorer, which you can use to research the queries that websites rank for in organic search results.

Keywords explorer

7.5 billion keywords

  • 3,159,164,014 United States
  • 513,609,745 Brazil
  • 342,763,605 France
  • 316,813,941 United Kingdom
  • 184,956,208 Germany
  • 179,593,079 Spain
  • 177,031,388 Poland
  • 160,068,747 Italy
  • 139,185,791 Russian Federation
  • 137,622,160 Mexico
  • 133,666,748 Canada
  • 118,135,951 Argentina
  • 112,285,223 Japan
  • 110,971,528 India
  • 101,602,220 Colombia
  • 96,779,195 Australia
  • 77,458,008 Ukraine
  • 59,616,147 Indonesia
  • 57,443,412 Chile
  • 56,108,489 Turkey
  • 49,365,267 Venezuela
  • 48,568,929 Czech Republic
  • 47,930,334 Philippines
  • 46,677,980 Netherlands
  • 44,711,890 Taiwan
  • 42,774,281 Belgium
  • 41,569,295 Peru
  • 37,177,988 Hungary
  • 36,937,655 Greece
  • 33,510,593 Ecuador
  • 30,305,603 Romania
  • 29,744,267 Finland
  • 27,522,446 Pakistan
  • 27,367,395 Viet Nam
  • 27,077,559 Portugal
  • 26,532,453 Sweden
  • 25,773,483 Malaysia
  • 25,677,300 Egypt
  • 23,591,658 Algeria
  • 22,789,097 Norway
  • 22,561,008 Morocco
  • 22,006,326 South Africa
  • 21,913,719 Thailand
  • 20,747,159 Korea
  • 20,687,977 Austria
  • 20,389,132 New Zealand
  • 19,251,479 Switzerland
  • 18,337,211 Serbia
  • 17,428,287 Slovakia
  • 17,273,056 Denmark
  • 16,848,234 Bulgaria
  • 15,622,325 Saudi Arabia
  • 14,101,258 Croatia
  • 13,788,428 Israel
  • 13,711,643 Hong Kong
  • 13,399,998 Bolivia
  • 13,321,442 Belarus
  • 12,980,568 Uruguay
  • 12,587,288 Ireland
  • 11,970,919 Singapore
  • 11,534,160 Tunisia
  • 11,242,601 Kazakhstan
  • 10,687,503 Dominican Republic
  • 10,038,765 Costa Rica
  • 8,833,359 Lithuania
  • 8,305,937 Slovenia
  • 7,776,798 Guatemala
  • 7,723,509 Sri Lanka
  • 7,529,508 Bangladesh
  • 6,852,704 United Arab Emirates
  • 6,289,604 Panama
  • 6,204,308 Bosnia & Herzegovina
  • 6,128,301 El Salvador
  • 6,076,767 Latvia
  • 5,971,260 Nigeria
  • 5,786,363 Paraguay
  • 5,572,253 Estonia
  • 5,235,887 Moldova
  • 4,595,984 Honduras
  • 3,690,585 Azerbaijan
  • 3,487,153 Kenya
  • 3,282,364 Puerto Rico
  • 3,265,838 Armenia
  • 3,066,075 Trinidad And Tobago
  • 2,858,494 Jordan
  • 2,823,049 Mauritius
  • 2,653,483 Reunion
  • 2,588,656 Macedonia
  • 2,566,538 Nicaragua
  • 2,546,009 Jamaica
  • 2,505,587 Georgia
  • 2,368,638 Iraq
  • 2,057,414 Ghana
  • 2,048,132 Palestinian Territory
  • 1,697,988 Malta
  • 1,616,273 Albania
  • 1,595,908 Qatar
  • 1,594,072 Lebanon
  • 1,566,462 Cyprus
  • 1,561,005 Nepal
  • 1,476,810 Zimbabwe
  • 1,423,232 Madagascar
  • 1,402,931 Luxembourg
  • 1,350,976 Kuwait
  • 1,347,706 Cote D'Ivoire
  • 1,324,559 Cameroon
  • 1,276,650 Oman
  • 1,129,467 Senegal
  • 1,074,279 Angola
  • 1,068,562 Iceland
  • 1,039,718 Montenegro
  • 1,030,578 Guadeloupe
  • 969,017 Martinique
  • 922,000 Cambodia
  • 914,138 Yemen
  • 898,990 Tanzania
  • 880,331 Bahrain
  • 832,642 Kyrgyzstan
  • 762,985 Mozambique
  • 748,065 Libya
  • 740,777 New Caledonia
  • 637,818 Mongolia
  • 577,560 Ethiopia
  • 519,272 Zambia
  • 496,852 Namibia
  • 481,390 Brunei Darussalam
  • 476,750 Haiti
  • 475,820 French Polynesia
  • 467,381 French Guiana
  • 449,645 Fiji
  • 443,995 Guyana
  • 341,336 Belize
  • 339,498 Botswana
  • 323,144 Bahamas
  • 303,762 Gabon
  • 287,095 Afghanistan
  • 275,764 Congo, Democratic Republic
  • 266,730 Maldives
  • 240,738 Mayotte
  • 240,348 Suriname
  • 229,442 Cape Verde
  • 224,687 Guam
  • 191,106 Saint Lucia
  • 176,222 Rwanda
  • 174,107 Antigua And Barbuda
  • 169,416 Benin
  • 166,590 Andorra
  • 166,441 Laos
  • 147,601 Saint Vincent And Grenadines
  • 138,857 Burkina Faso
  • 136,498 Aruba
  • 125,820 Tajikistan
  • 123,561 Grenada
  • 109,649 Togo
  • 106,913 Malawi
  • 104,322 Djibouti
  • 102,047 Congo
  • 93,473 Mauritania
  • 89,764 Monaco
  • 88,054 Guinea
  • 87,734 Saint Kitts And Nevis
  • 85,868 Seychelles
  • 85,569 Cayman Islands
  • 84,102 Bhutan
  • 81,009 Mali
  • 72,750 Faroe Islands
  • 66,007 Virgin Islands, U.S.
  • 56,969 Gibraltar
  • 43,970 Niger
  • 22,035 Equatorial Guinea
Site explorer

473 million keywords

  • 150,265,904 United States
  • 25,056,228 Japan
  • 20,977,970 Germany
  • 20,184,066 United Kingdom
  • 19,986,503 France
  • 17,325,060 Brazil
  • 17,279,797 Canada
  • 16,326,417 Australia
  • 16,251,999 India
  • 13,686,027 Italy
  • 12,307,206 Russian Federation
  • 10,495,971 Spain
  • 10,163,200 Turkey
  • 9,416,082 Poland
  • 9,006,162 Mexico
  • 8,312,534 Indonesia
  • 5,939,412 Netherlands
  • 5,151,000 Ukraine
  • 4,871,406 Viet Nam
  • 4,758,087 Argentina
  • 4,027,418 Thailand
  • 3,760,301 Colombia
  • 3,497,110 Sweden
  • 2,979,926 Taiwan
  • 2,912,742 Philippines
  • 2,719,220 Chile
  • 2,403,095 Venezuela
  • 2,321,281 Austria
  • 2,186,162 Denmark
  • 2,129,433 Czech Republic
  • 1,981,782 Peru
  • 1,895,617 Israel
  • 1,895,004 Greece
  • 1,819,222 Belgium
  • 1,755,017 Egypt
  • 1,676,473 Hungary
  • 1,583,125 Pakistan
  • 1,557,581 Singapore
  • 1,533,869 Malaysia
  • 1,521,027 Norway
  • 1,461,519 Romania
  • 1,434,959 Hong Kong
  • 1,408,890 Korea
  • 1,349,687 Finland
  • 1,219,181 Portugal
  • 1,189,394 South Africa
  • 1,184,070 New Zealand
  • 1,152,995 Algeria
  • 1,110,806 Ecuador
  • 1,097,936 Saudi Arabia
  • 1,016,938 Switzerland
  • 948,592 Morocco
  • 830,691 Bulgaria
  • 758,729 Serbia
  • 746,025 Slovakia
  • 662,311 Ireland
  • 604,866 Croatia
  • 542,816 Kazakhstan
  • 519,724 Belarus
  • 509,014 United Arab Emirates
  • 412,198 Uruguay
  • 400,013 Bangladesh
  • 396,473 Bolivia
  • 395,316 Dominican Republic
  • 392,404 Sri Lanka
  • 392,252 Tunisia
  • 387,787 Lithuania
  • 350,858 Costa Rica
  • 337,497 Slovenia
  • 319,503 Guatemala
  • 316,058 Nigeria
  • 254,972 Iraq
  • 243,799 Azerbaijan
  • 238,980 Bosnia & Herzegovina
  • 227,127 Latvia
  • 225,807 Panama
  • 219,483 Kenya
  • 216,050 Estonia
  • 206,453 El Salvador
  • 187,215 Paraguay
  • 181,062 Jordan
  • 175,707 Moldova
  • 166,473 Puerto Rico
  • 159,948 Honduras
  • 157,028 Armenia
  • 152,581 Georgia
  • 117,121 Ghana
  • 115,299 Trinidad And Tobago
  • 115,274 Jamaica
  • 107,273 Palestinian Territory
  • 103,176 Qatar
  • 102,435 Macedonia
  • 101,641 Lebanon
  • 96,406 Kuwait
  • 94,303 Mauritius
  • 94,159 Nicaragua
  • 90,035 Nepal
  • 82,437 Albania
  • 77,081 Cyprus
  • 74,559 Oman
  • 71,367 Tanzania
  • 71,047 Cote D'Ivoire
  • 63,300 Malta
  • 57,269 Luxembourg
  • 56,700 Senegal
  • 56,662 Cameroon
  • 56,445 Kyrgyzstan
  • 54,333 Cambodia
  • 48,330 Angola
  • 48,021 Bahrain
  • 47,439 Libya
  • 46,681 Iceland
  • 44,035 Guadeloupe
  • 41,386 Zimbabwe
  • 40,014 Mozambique
  • 39,414 Montenegro
  • 38,085 Mongolia
  • 37,909 Madagascar
  • 35,221 Ethiopia
  • 24,282 Namibia
  • 24,053 Haiti
  • 23,078 Zambia
  • 20,233 Brunei Darussalam
  • 18,258 Fiji
  • 17,357 Afghanistan
  • 16,429 Bahamas
  • 16,086 Laos
  • 15,617 Guyana
  • 15,333 Suriname
  • 14,239 Congo, Democratic Republic
  • 13,999 Maldives
  • 13,813 Botswana
  • 13,169 Gabon
  • 13,098 Tajikistan
  • 11,525 Rwanda
  • 10,958 Belize
  • 10,188 Burkina Faso
  • 9,206 Congo
  • 8,927 Benin
  • 8,900 Cape Verde
  • 8,109 Mali
  • 7,234 Togo
  • 6,658 Saint Vincent And Grenadines
  • 6,388 Bhutan
  • 6,115 Andorra
  • 5,677 Antigua And Barbuda
  • 5,465 Niger
  • 5,237 Malawi
  • 4,464 Djibouti
  • 3,619 Virgin Islands, U.S.
  • 3,365 Seychelles
  • 3,056 Gibraltar
  • 5 New Caledonia
  • 2 Mauritania
  • 1 Monaco

Server fleet

We're proud of our backend infrastructure. No existing solution could keep up with the volume of data that we handle, so we had to custom-build the larger part of our software infrastructure.

2,000 Servers

  • 65,000 CPU cores
  • 360TB RAM
  • 48PB HDD
  • 7PB SSD