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id header vs class header

Seeing if its more common to use an ID or a class name for a very common piece of a web template.

grep pattern	Number of Urls	Number of Domains
id="header"	925,313,752	13,843,265
class="header"	214,882,338	2,131,050

List of top 100 domains in rank order:

id="header"

URL	Site Rank
1. twitter.com	23,637
2. www.adobe.com	17,911
3. www.youtube.com	16,330
4. www.microsoft.com	15,371
5. maps.google.com	15,290
6. www.google.com	14,561
7. en.wikipedia.org	14,023
8. sourceforge.net	11,194
9. www.amazon.com	11,080
10. www.myspace.com	11,069
11. www.twitter.com	10,841
12. www.apple.com	10,801
13. google.com	10,380
14. www.flickr.com	10,069
15. www.addthis.com	10,039
16. vimeo.com	9,562
17. www.geocities.com	9,154
18. wordpress.com	8,870
19. www.linkedin.com	8,810
20. creativecommons.org	8,493
21. myspace.com	8,374
22. wordpress.org	8,013
23. www.nytimes.com	7,942
24. news.bbc.co.uk	7,691
25. www.imdb.com	7,651
26. sites.google.com	7,628
27. www.bbc.co.uk	7,488
28. www.w3.org	7,164
29. www.guardian.co.uk	7,145
30. www.cnn.com	6,918
31. www.paypal.com	6,908
32. bit.ly	6,855
33. www.gnu.org	6,768
34. www.wunderground.com	6,724
35. www.pbs.org	6,602
36. www.cdc.gov	6,428
37. www.usatoday.com	6,420
38. feeds.feedburner.com	6,374
39. www.washingtonpost.com	6,297
40. online.wsj.com	5,908
41. groups.yahoo.com	5,838
42. ec.europa.eu	5,825
43. code.google.com	5,785
44. twitpic.com	5,715
45. github.com	5,690
46. www.wired.com	5,626
47. www.whitehouse.gov	5,607
48. www.epa.gov	5,597
49. www.mozilla.org	5,557
50. www.ibm.com	5,546
51. www.telegraph.co.uk	5,508
52. www.npr.org	5,504
53. www.time.com	5,415
54. mashable.com	5,356
55. digg.com	5,247
56. www.reuters.com	5,247
57. www.scribd.com	5,224
58. www.weather.com	5,165
59. www.bloomberg.com	5,161
60. www.mozilla.com	5,146
61. www.ncbi.nlm.nih.gov	5,140
62. www.surveymonkey.com	5,091
63. www.slideshare.net	5,089
64. www.un.org	5,045
65. openoffice.org	5,036
66. www.cisco.com	5,035
67. www.nasa.gov	4,991
68. www.amazon.co.uk	4,969
69. www.forbes.com	4,929
70. technorati.com	4,915
71. spreadsheets.google.com	4,871
72. www.angelfire.com	4,860
73. www.freewebs.com	4,850
74. www.businessweek.com	4,807
75. www.blogger.com	4,795
76. www.msnbc.msn.com	4,783
77. abcnews.go.com	4,751
78. groups.google.com	4,746
79. www.who.int	4,725
80. docs.google.com	4,661
81. www.real.com	4,645
82. www.latimes.com	4,593
83. www.foxnews.com	4,574
84. www.boston.com	4,527
85. members.tripod.com	4,520
86. drupal.org	4,518
87. www.apache.org	4,501
88. europa.eu	4,474
89. www.java.com	4,466
90. www.loc.gov	4,418
91. java.sun.com	4,416
92. msdn.microsoft.com	4,408
93. www.fda.gov	4,403
94. soundcloud.com	4,379
95. www.huffingtonpost.com	4,318
96. news.yahoo.com	4,316
97. web.mit.edu	4,311
98. ezinearticles.com	4,286
99. support.microsoft.com	4,277
100. www.timesonline.co.uk	4,267

class="header"

URL	Site Rank
1. twitter.com	23,048
2. www.adobe.com	17,929
3. www.youtube.com	16,330
4. www.facebook.com	16,071
5. www.microsoft.com	15,371
6. maps.google.com	15,290
7. www.google.com	14,561
8. sourceforge.net	11,194
9. www.amazon.com	11,080
10. www.myspace.com	11,069
11. www.apple.com	10,800
12. google.com	10,276
13. vimeo.com	9,552
14. www.linkedin.com	8,809
15. creativecommons.org	8,368
16. www.nytimes.com	7,942
17. news.bbc.co.uk	7,692
18. www.imdb.com	7,651
19. sites.google.com	7,628
20. wordpress.org	7,614
21. www.bbc.co.uk	7,488
22. www.w3.org	7,164
23. www.guardian.co.uk	7,145
24. www.cnn.com	7,069
25. www.mapquest.com	6,909
26. www.paypal.com	6,908
27. www.gnu.org	6,768
28. www.wunderground.com	6,724
29. www.pbs.org	6,602
30. www.cdc.gov	6,428
31. feeds.feedburner.com	6,342
32. www.washingtonpost.com	6,302
33. www.usatoday.com	6,269
34. online.wsj.com	5,914
35. ec.europa.eu	5,825
36. code.google.com	5,659
37. www.whitehouse.gov	5,607
38. www.epa.gov	5,597
39. www.mozilla.org	5,554
40. github.com	5,511
41. www.telegraph.co.uk	5,508
42. www.wired.com	5,472
43. mashable.com	5,455
44. www.npr.org	5,444
45. www.slideshare.net	5,315
46. www.time.com	5,299
47. www.ncbi.nlm.nih.gov	5,251
48. www.nasa.gov	5,245
49. www.reuters.com	5,235
50. www.scribd.com	5,223
51. www.weather.com	5,175
52. www.bloomberg.com	5,167
53. www.cisco.com	5,092
54. www.un.org	5,045
55. openoffice.org	5,036
56. nytimes.com	5,036
57. www.amazon.co.uk	5,035
58. issuu.com	4,994
59. www.forbes.com	4,928
60. www.ibm.com	4,916
61. www.angelfire.com	4,860
62. abcnews.go.com	4,824
63. www.businessweek.com	4,807
64. groups.google.com	4,751
65. www.freewebs.com	4,731
66. www.blogger.com	4,730
67. www.who.int	4,725
68. www.msnbc.msn.com	4,723
69. spreadsheets.google.com	4,664
70. www.real.com	4,645
71. www.latimes.com	4,593
72. www.foxnews.com	4,569
73. www.boston.com	4,527
74. members.tripod.com	4,520
75. drupal.org	4,484
76. yfrog.com	4,474
77. msdn.microsoft.com	4,456
78. www.huffingtonpost.com	4,439
79. www.loc.gov	4,418
80. java.sun.com	4,416
81. www.fda.gov	4,403
82. soundcloud.com	4,379
83. web.mit.edu	4,311
84. support.microsoft.com	4,288
85. video.google.com	4,264
86. www.archive.org	4,262
87. www.cia.gov	4,246
88. arstechnica.com	4,229
89. www.nlm.nih.gov	4,199
90. news.yahoo.com	4,193
91. groups.yahoo.com	4,177
92. www.timesonline.co.uk	4,171
93. www.sfgate.com	4,103
94. www.hp.com	4,095
95. docs.google.com	4,082
96. www.joomla.org	4,074
97. gizmodo.com	4,038
98. apps.facebook.com	4,019
99. www.nps.gov	4,017
100. homepage.mac.com	4,017

for the complete list email sales@blekko.com

CSV of top 500

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id header vs class header