There are 95 (0-94) available nation slots. About 70 of them are being used by the game already, the others can be used by mod nations. The slots that the game uses so far are:
Code:
0 EA Arcoscephale
1 EA Ermor
2 EA Ulm
3 EA Marverni
4 EA Sauromatia
5 EA T'ien Ch'i
6 EA Machaka (not yet, announced)
7 EA Mictlan
8 EA Abysia
9 EA Caelum
10 EA C'tis
11 EA Pangaea
12 EA Agartha
13 EA Tir na n'Og
14 EA Fomoria
15 EA Vanheim
16 EA Helheim
17 EA Niefelheim
18 EA Kailasa
19 EA Yomi
20 EA Hinnom
21 EA Atlantis
22 EA R'lyeh
23 Special Monsters
24 Special Monsters
25 Independents
26 EA Oceania
27 MA Arcoscephale
28 MA Ermor
29 MA Pythium
30 MA Man
31 MA Ulm
32 MA Marignon
33 MA Mictlan
34 MA T'ien Ch'i
35 MA Machaka
36 MA Agartha
37 MA Abysia
38 MA Caelum
39 MA C'tis
40 MA Pangaea
41 MA Vanheim
42 MA Jotunheim
43 MA Bandar Log
44 MA Shinuyama
45 MA Ashdod
46 MA Atlantis
47 MA R'lyeh
48 MA Oceania
49 LA Arcoscephale
50 LA Ermor
51 LA Man
52 LA Ulm
53 LA Marignon
54 LA Mictlan
55 LA T'ien Ch'i
56 LA Jomon
57 LA Agartha
58 LA Abysia
59 LA Caelum
60 LA C'tis
61 LA Pangaea
62 LA Midgård
63 LA Utgård
64 LA Patala
65 LA Gath
66 LA Atlantis
67 LA R'lyeh
68 EA Lanka
69 MA Eriu
70 LA Pythium
71 LA Bogarus
That a game doesn't start with 9 nations for you if you pick random numbers is likely because the nations are partitioned into three eras. The era that you use decides which nations you picked are being used. You either need to only roll nations from a specific era, or use a mod which places all nations into the same era, so that it works like you want.