I know I'm kinda bumping an old dead thread, but there is a new one that is less informative (IMHO) than this, on the same subject... For those attemting something like this, I think you will find the following information useful.
For those to whom it may be of interest, the complete, default XP - Level table is:-
Code:
Level 00 01 02 03 04 05 06 07 Experience To Next Level
1 E8 03 00 00 00 00 00 00 1000 0 1000 1000
2 C4 09 00 00 00 00 00 00 2500 0 2500 1500
3 88 13 00 00 00 00 00 00 5000 0 5000 2500
4 1C 25 00 00 00 00 00 00 9500 0 9500 4500
5 CC 42 00 00 00 00 00 00 17100 0 17100 7600
6 E5 74 00 00 00 00 00 00 29925 0 29925 12825
7 0F C9 00 00 00 00 00 00 51471 0 51471 21546
8 CC 55 01 00 00 00 00 00 87500 0 87500 36029
9 E1 22 02 00 00 00 00 00 140001 0 140001 52501
10 41 3F 03 00 00 00 00 00 212801 0 212801 72800
11 02 AD 04 00 00 00 00 00 306434 0 306434 93633
12 EE 5B 06 00 00 00 00 00 416750 0 416750 110316
13 08 34 08 00 00 00 00 00 537608 0 537608 120858
14 0A 41 0A 00 00 00 00 00 672010 0 672010 134402
15 0D B7 0C 00 00 00 00 00 833293 0 833293 161283
16 B6 A3 0F 00 00 00 00 00 1024950 0 1024950 191657
17 87 14 13 00 00 00 00 00 1250439 0 1250439 225489
18 0D 20 17 00 00 00 00 00 1515533 0 1515533 265094
19 BE D7 1B 00 00 00 00 00 1824702 0 1824702 309169
20 C7 4C 21 00 00 00 00 00 2182343 0 2182343 357641
21 70 8F 27 00 00 00 00 00 2592624 0 2592624 410281
22 60 AE 2E 00 00 00 00 00 3059296 0 3059296 466672
23 BE CD 36 00 00 00 00 00 3591614 0 3591614 532318
24 BD 02 40 00 00 00 00 00 4195005 0 4195005 603391
25 64 61 4A 00 00 00 00 00 4874596 0 4874596 679591
26 D9 FB 55 00 00 00 00 00 5635033 0 5635033 760437
27 A0 E1 62 00 00 00 00 00 6480288 0 6480288 845255
28 C9 1E 71 00 00 00 00 00 7413449 0 7413449 933161
29 0F D8 80 00 00 00 00 00 8443919 0 8443919 1030470
30 EC 1B 92 00 00 00 00 00 9575404 0 9575404 1131485
31 6F 1A A5 00 00 00 00 00 10820207 0 10820207 1244803
32 45 12 BA 00 00 00 00 00 12194373 0 12194373 1374166
33 EB 24 D1 00 00 00 00 00 13706475 0 13706475 1512102
34 E9 A8 EA 00 00 00 00 00 15378665 0 15378665 1672190
35 A9 D1 06 01 00 00 00 00 17224105 0 17224105 1845440
36 2E 18 26 01 00 00 00 00 19273774 0 19273774 2049669
37 2F CC 48 01 00 00 00 00 21548079 0 21548079 2274305
38 54 44 6F 01 00 00 00 00 24069204 0 24069204 2521125
39 B0 DE 99 01 00 00 00 00 26861232 0 26861232 2792028
40 42 01 C9 01 00 00 00 00 29950274 0 29950274 3089042
41 7D 1A FD 01 00 00 00 00 33364605 0 33364605 3414331
42 D5 A1 36 02 00 00 00 00 37134805 0 37134805 3770200
43 50 18 76 02 00 00 00 00 41293904 0 41293904 4159099
44 C9 67 BB 02 00 00 00 00 45836233 0 45836233 4542329
45 0B 57 08 03 00 00 00 00 50878219 0 50878219 5041986
46 C7 BC 5D 03 00 00 00 00 56474823 0 56474823 5596604
47 4E 87 BC 03 00 00 00 00 62687054 0 62687054 6212231
48 26 BF 25 04 00 00 00 00 69582630 0 69582630 6895576
49 EF 89 9A 04 00 00 00 00 77236719 0 77236719 7654089
50 4B 5B 1D 05 00 00 00 00 85809995 0 85809995 8573276
51 F8 B1 AE 05 00 00 00 00 95334904 0 95334904 9524909
52 97 2A 50 06 00 00 00 00 105917079 0 105917079 10582175
53 93 8F 03 07 00 00 00 00 117673875 0 117673875 11756796
54 3B DE CA 07 00 00 00 00 130735675 0 130735675 13061800
55 BE 4B A9 08 00 00 00 00 145312702 0 145312702 14577027
56 3D 86 A0 09 00 00 00 00 161515069 0 161515069 16202367
57 9F 51 B3 0A 00 00 00 00 179523999 0 179523999 18008930
58 BD C0 E4 0B 00 00 00 00 199540925 0 199540925 20016926
59 2A 3E 38 0D 00 00 00 00 221789738 0 221789738 22248813
60 2D 47 B3 0E 00 00 00 00 246630189 0 246630189 24840451
61 E2 C3 58 10 00 00 00 00 274252770 0 274252770 27622581
62 78 75 2D 12 00 00 00 00 304969080 0 304969080 30716310
63 71 A5 36 14 00 00 00 00 339125617 0 339125617 34156537
64 E7 34 7A 16 00 00 00 00 377107687 0 377107687 37982070
65 0E 8E 01 19 00 00 00 00 419532302 0 419532302 42424615
66 D5 BA D1 1B 00 00 00 00 466729685 0 466729685 47197383
67 A7 EC F2 1E 00 00 00 00 519236775 0 519236775 52507090
68 E0 40 6E 22 00 00 00 00 577650912 0 577650912 58414137
69 60 DB 4D 26 00 00 00 00 642636640 0 642636640 64985728
70 35 EB A1 2A 00 00 00 00 715254581 0 715254581 72617941
71 0C 31 73 2F 00 00 00 00 796078348 0 796078348 80823767
72 02 D3 CF 34 00 00 00 00 886035202 0 886035202 89956854
73 7B 90 C7 3A 00 00 00 00 986157179 0 986157179 100121977
74 6D F0 6B 41 00 00 00 00 1097592941 0 1097592941 111435762
75 8C D4 D8 48 00 00 00 00 1222169740 0 1222169740 124576799
76 F5 78 1D 51 00 00 00 00 1360886005 0 1360886005 138716265
77 87 5A 52 5A 00 00 00 00 1515346567 0 1515346567 154460562
78 A2 BD 92 64 00 00 00 00 1687338402 0 1687338402 171991835
79 EF FE FC 6F 00 00 00 00 1878851311 0 1878851311 191512909
80 7C 46 6D 7D 00 00 00 00 2104313468 0 2104313468 225462157
81 6C 63 7A 8C 00 00 00 00 2356831084 0 2356831084 252517616
82 FF DF 55 9D 00 00 00 00 2639650815 0 2639650815 282819731
83 50 38 37 B0 00 00 00 00 2956408912 0 2956408912 316758097
84 FE 90 5C C5 00 00 00 00 3311177982 0 3311177982 354769070
85 AC 83 0B DD 00 00 00 00 3708519340 0 3708519340 397341358
86 1D 04 92 F7 00 00 00 00 4153541661 0 4153541661 445022321
87 C4 60 47 15 01 00 00 00 356999364 1 4651966659 498424998
88 23 62 8D 36 01 00 00 00 915235363 1 5210202658 558235999
89 F7 A8 A9 74 01 00 00 00 1957275895 1 6252243190 1042040532
90 F5 FD 31 BF 01 00 00 00 3207724533 1 7502691828 1250448638
91 F3 63 A2 18 02 00 00 00 413295603 2 9003230193 1500538365
92 8A 11 F6 83 02 00 00 00 2213941642 2 10803876232 1800646039
93 D9 E1 C0 04 03 00 00 00 79749593 3 12964651478 2160775246
94 D2 DB 4D 9F 03 00 00 00 2672679890 3 15557581775 2592930297
95 96 D4 C3 58 04 00 00 00 1489228950 4 18669098130 3111516355
96 80 65 51 37 05 00 00 00 928081280 5 22402917755 3733819625
97 01 AD 61 42 06 00 00 00 1113697537 6 26883501307 4480583552
98 67 9C DB 82 07 00 00 00 2195430503 7 32260201568 5376700261
99 E2 EE 6D 03 09 00 00 00 57536226 9 38712241881 6452040313
100 DC 51 EA D0 0A 00 00 00 3505017308 10 46454690258 7742448377
101 A2 C8 B2 FA 0C 00 00 00 4206020770 12 55745628310 9290938052
102 C3 F0 3C 93 0F 00 00 00 2470244547 15 66894753972 11149125662
103 50 87 AF B0 12 00 00 00 2964293456 18 80273704766 13378950794
104 2D 6F 9F 6D 16 00 00 00 1839165229 22 96328445719 16054740953
105 6A 85 F2 E9 1A 00 00 00 3924985194 26 115594134864 19265689145
106 4C D3 EF 4B 20 00 00 00 1274008396 32 138712961836 23118826972
107 C1 30 86 C1 26 00 00 00 3246796993 38 166455554203 27742592367
108 82 3A D4 81 2E 00 00 00 2178169474 46 199746665044 33291110841
109 9C AC FE CE 37 00 00 00 3472796828 55 239695998053 39949333009
110 21 CF 64 F8 42 00 00 00 4167356193 66 287635197663 47939199610
111 5B C5 45 5D 50 00 00 00 1564853595 80 345162237195 57527039532
112 3A 53 ED 6F 60 00 00 00 1877824314 96 414194684634 69032447439
113 AC 30 83 B9 73 00 00 00 3112382636 115 497033621561 82838936927
114 9C 6D 9D DE 8A 00 00 00 3734859164 138 596440345874 99406724313
115 EE E9 BC A4 A6 00 00 00 2763844078 166 715728415048 119288069174
116 51 B2 E2 F8 C7 00 00 00 4175606353 199 858874098058 143145683010
117 94 6F 76 F7 EF 00 00 00 4151734164 239 1030648917669 171774819611
118 B2 52 C1 F5 1F 01 00 00 4123087538 287 1236778701203 206129783534
119 3C 63 4E 8D 59 01 00 00 2370724668 345 1484134441443 247355740240
120 C6 73 DB 24 93 01 00 00 618361798 403 1731490181683 247355740240
121 50 84 68 BC CC 01 00 00 3160966224 460 1978845921924 247355740241
122 DA 94 F5 53 06 02 00 00 1408603354 518 2226201662164 247355740240
123 64 A5 82 EB 3F 02 00 00 3951207780 575 2473557402405 247355740241
124 EE B5 0F 83 79 02 00 00 2198844910 633 2720913142645 247355740240
125 78 C6 9C 1A B3 02 00 00 446482040 691 2968268882885 247355740240
126 02 D7 29 B2 EC 02 00 00 2989086466 748 3215624623126 247355740241
127 8C E7 B6 49 26 03 00 00 1236723596 806 3462980363366 247355740240
128 16 F8 43 E1 5F 03 00 00 3779328022 863 3710336103607 247355740241
129 A0 08 D1 78 99 03 00 00 2026965152 921 3957691843847 247355740240
130 2A 19 5E 10 D3 03 00 00 274602282 979 4205047584087 247355740240
131 B4 29 EB A7 0C 04 00 00 2817206708 1036 4452403324328 247355740241
132 3E 3A 78 3F 46 04 00 00 1064843838 1094 4699759064568 247355740240
133 C8 4A 05 D7 7F 04 00 00 3607448264 1151 4947114804809 247355740241
134 52 5B 92 6E B9 04 00 00 1855085394 1209 5194470545049 247355740240
135 DC 6B 1F 06 F3 04 00 00 102722524 1267 5441826285289 247355740240
136 66 7C AC 9D 2C 05 00 00 2645326950 1324 5689182025530 247355740241
137 F0 8C 39 35 66 05 00 00 892964080 1382 5936537765770 247355740240
138 7A 9D C6 CC 9F 05 00 00 3435568506 1439 6183893506011 247355740241
139 04 AE 53 64 D9 05 00 00 1683205636 1497 6431249246251 247355740240
140 8E BE E0 FB 12 06 00 00 4225810062 1554 6678604986492 247355740241
141 18 CF 6D 93 4C 06 00 00 2473447192 1612 6925960726732 247355740240
142 A2 DF FA 2A 86 06 00 00 721084322 1670 7173316466972 247355740240
143 2C F0 87 C2 BF 06 00 00 3263688748 1727 7420672207213 247355740241
144 B6 00 15 5A F9 06 00 00 1511325878 1785 7668027947453 247355740240
145 40 11 A2 F1 32 07 00 00 4053930304 1842 7915383687694 247355740241
146 CA 21 2F 89 6C 07 00 00 2301567434 1900 8162739427934 247355740240
147 54 32 BC 20 A6 07 00 00 549204564 1958 8410095168174 247355740240
148 DE 42 49 B8 DF 07 00 00 3091808990 2015 8657450908415 247355740241
149 68 53 D6 4F 19 08 00 00 1339446120 2073 8904806648655 247355740240
150 68 53 D6 4F 19 09 00 00 1339446120 2329 10004318276175 1099511627520
Attached as XLS & CSV... above code is tab delimited for easy text editing.
Also attached, and of interest to players is a graph of the XP to next level (what players call TNL) from one level to the next, as a PDF and Jpeg.
Working this stuff in a spreadsheet makes things much much easier... okay I didn't use the well known Micro$oft product... but if it's all you have available... I guess it will do.

tt1:
If you are not using the XLS, then the columns between 07 and Experience are Low DWord, High DWord... because the Hex function only works out DWords in Hex and all figures are in Quads. To calculate the decimal for the full Quad, you take the Little-Endian High DWord, multiply it by 4294967295 (0xFFFFFFFF) and add the Little-Endian Low DWord.
DWord is a Double Word, or just Double, or Long Int, depending on your coding language of preference. A Word is always a standard 16-bit Integer these days. A Quad is a Quadruple Word, or 4 Words, or 8 Bytes. Which is 64-bit precision integer.
To explain what I mean by Little-Endian, this means that the least significant byte comes first, so that a DWord containing the number 15 is signified by the digits 0F 00 00 00 for the Hex word 0x0000000F, in other words the bytes are written back to front. Big Endian DWords would be 00 00 00 0F. Which is easier to read in a Hex editor.
I haven't looked at my client... yet. But I hope this information is useful.