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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 (474 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
  • 520,440,594 Brazil
  • 345,977,838 France
  • 319,002,524 United Kingdom
  • 187,735,578 Germany
  • 181,998,547 Spain
  • 177,111,713 Poland
  • 160,309,345 Italy
  • 139,426,471 Russian Federation
  • 137,709,641 Mexico
  • 134,988,232 Canada
  • 119,644,753 Argentina
  • 112,954,132 Japan
  • 111,295,373 India
  • 102,425,870 Colombia
  • 97,655,475 Australia
  • 77,458,008 Ukraine
  • 59,683,245 Indonesia
  • 58,073,578 Chile
  • 56,108,489 Turkey
  • 49,405,057 Czech Republic
  • 49,365,267 Venezuela
  • 47,937,197 Philippines
  • 46,767,644 Netherlands
  • 44,711,890 Taiwan
  • 43,425,406 Belgium
  • 41,575,172 Peru
  • 37,178,276 Hungary
  • 36,937,655 Greece
  • 33,965,599 Ecuador
  • 30,306,991 Romania
  • 30,154,899 Finland
  • 27,523,751 Pakistan
  • 27,367,395 Vietnam
  • 27,078,903 Portugal
  • 26,570,513 Sweden
  • 26,035,788 Egypt
  • 25,776,279 Malaysia
  • 23,844,290 Algeria
  • 22,793,407 Norway
  • 22,561,203 Morocco
  • 22,006,326 South Africa
  • 21,956,337 Thailand
  • 20,990,027 Austria
  • 20,748,617 Korea
  • 20,391,194 New Zealand
  • 19,571,793 Switzerland
  • 18,337,211 Serbia
  • 17,583,913 Denmark
  • 17,428,287 Slovakia
  • 17,088,849 Bulgaria
  • 15,623,453 Saudi Arabia
  • 14,101,621 Croatia
  • 13,789,692 Israel
  • 13,711,890 Hong Kong
  • 13,547,661 Bolivia
  • 13,503,309 Belarus
  • 12,980,568 Uruguay
  • 12,587,288 Ireland
  • 11,971,898 Singapore
  • 11,534,160 Tunisia
  • 11,242,601 Kazakhstan
  • 10,813,125 Dominican Republic
  • 10,155,670 Costa Rica
  • 8,833,359 Lithuania
  • 8,305,937 Slovenia
  • 7,776,798 Guatemala
  • 7,723,509 Sri Lanka
  • 7,663,093 Bangladesh
  • 6,963,717 United Arab Emirates
  • 6,289,604 Panama
  • 6,285,154 Bosnia & Herzegovina
  • 6,128,301 El Salvador
  • 6,076,767 Latvia
  • 5,971,260 Nigeria
  • 5,786,363 Paraguay
  • 5,666,254 Estonia
  • 5,235,887 Moldova
  • 4,595,984 Honduras
  • 3,731,664 Azerbaijan
  • 3,487,153 Kenya
  • 3,295,899 Armenia
  • 3,282,364 Puerto Rico
  • 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
  • 1,642,031 Albania
  • 1,595,908 Qatar
  • 1,594,452 Cyprus
  • 1,594,072 Lebanon
  • 1,561,005 Nepal
  • 1,476,810 Zimbabwe
  • 1,423,232 Madagascar
  • 1,402,931 Luxembourg
  • 1,369,620 Cote D'Ivoire
  • 1,350,976 Kuwait
  • 1,345,648 Cameroon
  • 1,276,650 Oman
  • 1,129,467 Senegal
  • 1,091,171 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
  • 893,688 Bahrain
  • 832,642 Kyrgyzstan
  • 762,985 Mozambique
  • 748,065 Libya
  • 740,777 New Caledonia
  • 637,818 Mongolia
  • 593,360 Ethiopia
  • 519,272 Zambia
  • 496,852 Namibia
  • 489,384 Brunei Darussalam
  • 476,750 Haiti
  • 475,820 French Polynesia
  • 467,381 French Guiana
  • 457,735 Fiji
  • 443,995 Guyana
  • 349,863 Belize
  • 345,576 Botswana
  • 329,552 Bahamas
  • 305,429 Gabon
  • 290,165 Afghanistan
  • 278,706 Congo, Democratic Republic
  • 266,730 Maldives
  • 240,738 Mayotte
  • 240,348 Suriname
  • 233,499 Cape Verde
  • 224,687 Guam
  • 191,106 Saint Lucia
  • 177,558 Antigua And Barbuda
  • 176,222 Rwanda
  • 172,419 Benin
  • 169,177 Andorra
  • 166,441 Laos
  • 147,601 Saint Vincent And Grenadines
  • 141,077 Burkina Faso
  • 139,121 Aruba
  • 125,820 Tajikistan
  • 123,561 Grenada
  • 109,649 Togo
  • 106,913 Malawi
  • 105,744 Djibouti
  • 103,376 Congo
  • 93,473 Mauritania
  • 89,764 Monaco
  • 88,054 Guinea
  • 87,734 Saint Kitts And Nevis
  • 85,868 Seychelles
  • 85,569 Cayman Islands
  • 85,220 Bhutan
  • 81,009 Mali
  • 73,899 Faroe Islands
  • 66,007 Virgin Islands, U.S.
  • 56,969 Gibraltar
  • 43,970 Niger
  • 22,035 Equatorial Guinea
Site explorer

474 million keywords

  • 149,675,116 United States
  • 25,194,749 Japan
  • 21,030,942 Germany
  • 20,250,590 United Kingdom
  • 20,024,845 France
  • 17,286,061 Brazil
  • 17,216,940 Canada
  • 16,338,654 Australia
  • 16,319,769 India
  • 13,734,381 Italy
  • 12,352,195 Russian Federation
  • 10,555,647 Spain
  • 10,199,080 Turkey
  • 9,442,708 Poland
  • 8,995,306 Mexico
  • 8,319,679 Indonesia
  • 5,956,352 Netherlands
  • 5,177,800 Ukraine
  • 4,896,329 Vietnam
  • 4,767,897 Argentina
  • 4,055,674 Thailand
  • 3,759,074 Colombia
  • 3,505,853 Sweden
  • 2,996,353 Taiwan
  • 2,918,992 Philippines
  • 2,722,635 Chile
  • 2,408,909 Venezuela
  • 2,326,329 Austria
  • 2,192,626 Denmark
  • 2,127,506 Czech Republic
  • 1,990,619 Peru
  • 1,911,590 Greece
  • 1,899,983 Israel
  • 1,829,398 Belgium
  • 1,777,577 Egypt
  • 1,687,617 Hungary
  • 1,600,658 Pakistan
  • 1,562,861 Singapore
  • 1,544,762 Malaysia
  • 1,524,046 Norway
  • 1,475,856 Romania
  • 1,441,491 Hong Kong
  • 1,411,843 Korea
  • 1,356,105 Finland
  • 1,230,307 Portugal
  • 1,193,497 South Africa
  • 1,188,800 New Zealand
  • 1,155,685 Algeria
  • 1,115,581 Ecuador
  • 1,104,057 Saudi Arabia
  • 1,025,343 Switzerland
  • 957,358 Morocco
  • 837,227 Bulgaria
  • 765,028 Serbia
  • 750,209 Slovakia
  • 668,013 Ireland
  • 608,301 Croatia
  • 547,397 Kazakhstan
  • 524,047 Belarus
  • 515,624 United Arab Emirates
  • 413,338 Uruguay
  • 405,163 Bangladesh
  • 398,576 Bolivia
  • 397,555 Dominican Republic
  • 396,506 Sri Lanka
  • 395,464 Tunisia
  • 390,415 Lithuania
  • 352,417 Costa Rica
  • 339,030 Slovenia
  • 320,075 Guatemala
  • 319,454 Nigeria
  • 258,452 Iraq
  • 243,827 Azerbaijan
  • 240,713 Bosnia & Herzegovina
  • 227,967 Latvia
  • 226,285 Panama
  • 222,768 Kenya
  • 217,605 Estonia
  • 206,950 El Salvador
  • 187,966 Paraguay
  • 182,231 Jordan
  • 177,590 Moldova
  • 167,701 Puerto Rico
  • 160,519 Honduras
  • 156,904 Armenia
  • 153,443 Georgia
  • 118,056 Ghana
  • 116,250 Trinidad And Tobago
  • 116,213 Jamaica
  • 108,051 Palestinian Territory
  • 104,638 Qatar
  • 103,233 Macedonia
  • 102,541 Lebanon
  • 97,004 Kuwait
  • 95,125 Mauritius
  • 94,616 Nicaragua
  • 91,102 Nepal
  • 83,137 Albania
  • 77,743 Cyprus
  • 75,348 Oman
  • 71,958 Tanzania
  • 71,516 Cote D'Ivoire
  • 63,926 Malta
  • 57,710 Luxembourg
  • 57,181 Senegal
  • 57,035 Cameroon
  • 56,784 Kyrgyzstan
  • 54,613 Cambodia
  • 48,807 Angola
  • 48,226 Bahrain
  • 47,743 Libya
  • 46,896 Iceland
  • 44,309 Guadeloupe
  • 41,912 Zimbabwe
  • 40,278 Mozambique
  • 39,758 Montenegro
  • 38,830 Mongolia
  • 38,097 Madagascar
  • 35,665 Ethiopia
  • 24,525 Namibia
  • 24,364 Haiti
  • 23,294 Zambia
  • 20,409 Brunei Darussalam
  • 18,477 Fiji
  • 17,541 Afghanistan
  • 16,590 Bahamas
  • 16,347 Laos
  • 15,738 Guyana
  • 15,447 Suriname
  • 14,349 Congo, Democratic Republic
  • 14,122 Maldives
  • 13,912 Botswana
  • 13,276 Tajikistan
  • 13,266 Gabon
  • 11,678 Rwanda
  • 11,065 Belize
  • 10,250 Burkina Faso
  • 9,266 Congo
  • 9,010 Benin
  • 8,968 Cape Verde
  • 8,140 Mali
  • 7,311 Togo
  • 6,679 Saint Vincent And Grenadines
  • 6,438 Bhutan
  • 6,150 Andorra
  • 5,715 Antigua And Barbuda
  • 5,493 Niger
  • 5,317 Malawi
  • 4,492 Djibouti
  • 3,651 Virgin Islands, U.S.
  • 3,385 Seychelles
  • 3,066 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