University of California dreaming (or 68=71=72=74=76=77=78=81=197=198=199=200=204)?

It will surprise no one that a site like that of Earth Sciences at the University of California at Irvine attracts a lot of traffic -- almost 70,000 different IPs visited there in the fall of 2003, and these are recorded in the logs linked to below.  Among them are some of the Rogers IPs that we have been tracking in other posts: that is, those with the numbers 66.185.84.xxx (see the summary thread, here).   

Extracting these IPs from the log of September 2003 yields the following list:

hits	files	kbytes	visits	IP
3	3	155	1	66.185.84.68
73	70	1972	7	66.185.84.71
44	44	584	4	66.185.84.72
4	4	206	2	66.185.84.76
1	1	24	0	66.185.84.196
2	2	59	0	66.185.84.198
86	80	1558	5	66.185.84.199
43	43	841	5	66.185.84.200
1	1	1	0	66.185.84.201
1	1	54	1	66.185.84.204
26	26	635	2	66.185.84.209

Now, given the specific data at hand, it is impossible to tell whether these IPs reflect ten different individuals or one, since we don't have dates and times for their visits.  Still, since the IPs listed here are the same ones that we see shifting elsewhere (see the summary here), and since some of the visits are fleeting (x.x.x.78 somehow registers as zero visits), we should probably incline towards a smaller number.

The logs for October 2003 provide a similar group of IPs:

hits	files	kbytes	visits	IP
1	1	54	1	66.185.84.68
194	165	4526	17	66.185.84.71
73	72	1773	6	66.185.84.72
1	1	24	0	66.185.84.74
19	19	3432	2	66.185.84.76
1	1	12	1	66.185.84.77
1	1	24	0	66.185.84.78
22	13	156	3	66.185.84.81
12	12	120	2	66.185.84.197
2	2	107	1	66.185.84.198
168	152	2265	12	66.185.84.199
48	48	709	7	66.185.84.200
6	6	80	1	66.185.84.204

As do the logs from November, 2003:

hits	files	kbytes	visits	IP
9	9	328	1	66.185.84.68
2	2	180	1	66.185.84.69
7	4	29	1	66.185.84.70
193	167	3344	16	66.185.84.71
69	68	1657	8	66.185.84.72
14	6	130	5	66.185.84.76
1	0	0	0	66.185.84.77
1	0	0	0	66.185.84.78
1	1	44	0	66.185.84.79
11	11	290	0	66.185.84.80
25	23	642	2	66.185.84.81
247	230	4095	11	66.185.84.199
22	22	441	3	66.185.84.200
1	1	80	0	66.185.84.201
1	1	80	0	66.185.84.202
24	23	147	4	66.185.84.204
1	1	24	0	66.185.84.208
5	5	558	1	66.185.84.209

And December, 2003:

hits	files	kbytes	visits	IP
73	69	645	5	66.185.84.71
12	12	228	0	66.185.84.72
4	4	198	2	66.185.84.76
1	1	24	0	66.185.84.78
1	1	24	0	66.185.84.79
1	0	0	1	66.185.84.81
48	47	1774	7	66.185.84.199
32	32	783	2	66.185.84.200
14	14	509	1	66.185.84.204
22	22	495	1	66.185.84.208

In all,  there are twenty-two IPs listed in these months.  How many users is this?  Less than 22, presumably -- especially given the number of singletons in the "hits" and zeros in "visits".