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2. google.com
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3. dx.doi.org
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5. bing.com
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936178
10. worldcat.org
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12. toolserver.org
745139
13. web.archive.org
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14. aboutus.org
667179
15. dnsstuff.com
579569
16. jstor.org
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17. archive.org
527702
18. alexa.com
497667
490713
487218
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22. domainsdb.net
486586
23. viaf.org
459690
24. highbeam.com
425490
423795
26. youtube.com
412169
27. britannica.com
410394
28. imdb.com
399389
29. bartleby.com
357440
351256
31. robtex.com
343871
342583
33. bbc.co.uk
325035
306804
35. news.bbc.co.uk
292712
36. webcitation.org
288161
275644
38. edwardbetts.com
264884
39. nytimes.com
261705
224662
41. allmusic.com
212183
42. de.wikipedia.org
205907
43. nla.gov.au
200055
44. d-nb.info
197899
45. as3344.net
187829
46. news.google.com
185843
47. facebook.com
182879
48. id.loc.gov
182267
179840
50. isni-url.oclc.nl
179396
51. musicbrainz.org
178880
178703
53. catalogue.bnf.fr
170963
54. data.bnf.fr
170625
55. idref.fr
162836
56. focus.nps.gov
158268
57. fr.wikipedia.org
149648
58. billboard.com
147284
59. es.wikipedia.org
142312
134966
129735
62. ru.wikipedia.org
127209
63. guardian.co.uk
125043
64. amazon.com
122704
65. nlm.nih.gov
120971
117778
67. census.gov
116981
68. ebi.ac.uk
112686
69. twitter.com
109053
108223
99647
72. rcsb.org
97419
92726
92165
75. telegraph.co.uk
88807
85802
77. flickr.com
78637
78. it.wikipedia.org
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77508
81. thegazette.co.uk
76695
82. iucnredlist.org
73695
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84. insee.fr
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85. arxiv.org
67847
86. discogs.com
67350
66841
66790
65077
64770
64219
92. amar.org.ir
63492
93. getty.edu
62885
94. myspace.com
60777
95. theguardian.com
59846
59772
58074
98. uefa.com
57226
99. geonames.nga.mil
55789
100. legislation.gov.uk
55493