The following is a list of the browsers that hit the USConstitution.net from September 30, 2001 to October 9, 2001, with a cut-off of at least 20 hits per browser type in that period.

 #: #reqs:  browser
--: -----:  -------
 1: 36593:  MSIE 5.5
 2: 21104:  MSIE 5.0
 3: 11454:  MSIE 5.01
 4:  5689:  MSIE 6.0
 5:  3191:  MSIE 4.01
 6:  2834:  Mozilla 4.78
 7:  2253:  Mozilla 4.76
 8:  2066:  Mozilla 5.0
 9:  1973:  Mozilla (compatible)
10:  1839:  Mozilla 4.7
11:  1786:  Mozilla 4.77
12:  1518:  Mozilla 4.5
13:  1367:  Mozilla 4.75
14:   888:  Mozilla 4.08
15:   869:  MSIE 6.0b
16:   770:  Mozilla 4.61
17:   763:  Mozilla 4.73
18:   691:  Mozilla 4.72
19:   585:  FAST-WebCrawler 3.2 test
20:   443:  MSIE 4.5
21:   327:  Gulliver 1.3
22:   286:  Mozilla 4.73C-CCK-MCD
23:   284:  Mozilla 4.06
24:   271:  Mozilla 4.6
25:   266:  Mozilla 4.74
26:   262:  Mozilla 4.51
27:   250:  Mozilla 4.7C-CCK-MCD
28:   231:  Mozilla 3.0
29:   220:  Mozilla 4.05
30:   211:  Mozilla 4.04
31:   205:  ArchitextSpider
32:   197:  Googlebot 2.1 (+http:  www.googlebot.com bot.html)
33:   184:  Mozilla 4.75C-CCK-MCD
34:   152:  SpaceBison 0.01 [fu] (Win67; X; SK)
35:   151:  MSProxy 2.0
36:   128:  Mozilla 4.78C-CCK-MCD
37:   126:  MSIE 4.0
38:   124:  Scooter-W3-1.0
39:    92:  gazz 2.1 (gazz@nttrd.com)
40:    63:  MSIE 5.12
41:    55:  MSIE 3.01
42:    54:  Mozilla 4.07
43:    53:  MSIE 3.02
44:    48:  MSIE 5.1b1
45:    47:  Mozilla 4.03
46:    47:  Opera 5.12
47:    46:  Crescent Internet ToolPak HTTP OLE Control v.1.0
48:    40:  Mozilla 4.02
49:    39:  Slurp.so 1.0 (slurp@inktomi.com; http:  www.inktomi.com slurp.html)
50:    38:  About 0.1libwww-perl 5.47
51:    38:  WebTV 2.6
52:    31:  W3C Validator 1.183 libwww-perl 5.50
53:    30:  Mozilla 4.0
54:    28:  Mozilla 4.71
55:    28:  MSIE 3.0
56:    27:  MSIE 3.0b
57:    25:  Opera 5.11
58:    25:  Mozilla 4.76C-CCK-MCD
59:    24:  InfoNaviRobot(F107)
60:    24:  appie 1.1
61:    23:  Offline Explorer 1.0
62:    23:  Mozilla 3.01-C-MACOS8
63:    21:  webcollage 1.77
64:    20:  UCmore
65:    20:  URL Checker
  :   556:  [not listed: 140 browsers]

The following list compresses this down into a more manageable list:

#reqs:  browser
-----:  -------
36593:  MSIE 5.5
32669:  MSIE 5.0+
12700:  Mozilla 4.7+
 6558:  MSIE 6.0+
 4965:  MSIE 4.0+
 2066:  Mozilla 5.0
 1973:  Mozilla (compatible)
 1780:  Mozilla 4.5+
 1041:  Mozilla 4.6+
  443:  MSIE 4.5
  362:  Mozilla 3.0+
  126:  MSIE 4.0
   72:  Opera 5+
   55:  MSIE 3.0+
   38:  WebTV 2.6