Thank you so much for your instruction.
I am not very familiar with concepts like ports and internal pins, but a driver can usually have one drive and one or more loads, right?
In order to tell which node is drive and which are loads, were you looking at the CONN section only?
Here is another more complex net: Do you think it is a multi-fanout net? I see there are multiple *I's and one *P, but direction is "I" for all of them.
*D_NET *1918 0.073400
*CONN
*I *3791
0 I *L 0.0013 *D TH2MUX2XC
*I *3784
0 I *L 0.0013 *D TH2MUX2XC
*I *3740
0 I *L 0.0013 *D TH2MUX2XC
*I *3727
0 I *L 0.0013 *D TH2MUX2XC
*I *3705
0 I *L 0.0013 *D TH2MUX2XC
*I *3698
0 I *L 0.0013 *D TH2MUX2XC
*I *3684
0 I *L 0.0013 *D TH2MUX2XC
*I *3661
0 I *L 0.0013 *D TH2MUX2XC
*I *3657
0 I *L 0.0013 *D TH2MUX2XC
*I *3649
0 I *L 0.0013 *D TH2MUX2XC
*P *75 I
*CAP
1 *1918:2 0.0247997808
2 *1918:3 0.0011682144
3 *1918:4 0.0011682144
4 *1918:5 0.000736992
5 *1918:6 0.0014371344
6 *1918:8 0.0007001424
7 *1918:10 0.0002920536
8 *1918:11 0.0002920536
9 *1918:12 0.0004053456
10 *1918:13 0.0009580896
11 *1918:15 0.0008475408
12 *1918:17 0.0002947968
13 *1918:19 0.0005841072
14 *1918:20 0.0002920536
15 *1918:21 0.0008761608
16 *1918:22 0.0002920536
17 *1918:23 0.0002920536
18 *1918:26 0.0003316464
19 *1918:29 0.000184248
20 *1918:30 0.0001473984
21 *1918:32 0.0002920536
22 *1918:33 0.0002920536
23 *1918:34 7.36992e-05
24 *1918:35 7.36992e-05
25 *1918:37 0.0002920536
26 *1918:38 0.0002920536
27 *1918:42 0.0247997808
*RES
1 *1918:1 *1918:41 6.4000
2 *1918:2 *1918:42 1740.1010
3 *1918:3 *1918:2 6.4000
4 *1918:4 *1918:3 93.0812
5 *1918:5 *1918:4 6.4000
6 *1918:6 *1918:5 51.7118
7 *3698
0 *1918:52 6.4000
8 *1918:8 *1918:6 49.1262
9 *3657
0 *1918:51 6.4000
10 *1918:10 *1918:8 6.4000
11 *1918:11 *1918:10 23.2703
12 *1918:12 *1918:11 6.4000
13 *1918:13 *1918:12 28.4415
14 *3705
0 *1918:50 6.4000
15 *1918:15 *1918:13 38.7838
16 *3740
0 *1918:49 6.4000
17 *1918:17 *1918:15 20.6847
18 *3784
0 *1918:48 6.4000
19 *1918:19 *1918:15 6.4000
20 *1918:20 *1918:17 6.4000
21 *1918:21 *1918:19 46.5406
22 *1918:22 *1918:20 23.2703
23 *1918:23 *1918:21 23.2703
24 *1918:24 *1918:21 6.4000
25 *1918:25 *1918:22 6.4000
26 *1918:26 *1918:23 6.4000
27 *3649
0 *1918:47 6.4000
28 *3791
0 *1918:43 6.4000
29 *1918:29 *1918:26 12.9279
30 *1918:30 *1918:26 10.3424
31 *3727
0 *1918:44 6.4000
32 *1918:32 *1918:30 6.4000
33 *1918:33 *1918:32 23.2703
34 *1918:34 *1918:33 6.4000
35 *1918:35 *1918:34 5.1712
36 *3661
0 *1918:46 6.4000
37 *1918:37 *1918:35 6.4000
38 *1918:38 *1918:37 23.2703
39 *1918:39 *1918:38 6.4000
40 *3684
0 *1918:45 6.4000
41 *1918:41 *75 6.4000
42 *1918:42 *1918:1 6.4000
43 *1918:43 *1918:25 6.4000
44 *1918:44 *1918:29 6.4000
45 *1918:45 *1918:39 6.4000
46 *1918:46 *1918:34 6.4000
47 *1918:47 *1918:24 6.4000
48 *1918:48 *1918:15 6.4000
49 *1918:49 *1918:13 6.4000
50 *1918:50 *1918:12 6.4000
51 *1918:51 *1918:6 6.4000
52 *1918:52 *1918:5 6.4000
*END
For the net *3609: the output pin *4394:YB is a driver and output port *1804 is a load.