The maximum points you can allocate to STR/DEX/CON/SPR is 65,535. 16 bit number.
However, the maximum _serverside_ HP and Mana is also 65,535. So - if you put more than 2000 or so into CON (you'll have to make lvl 400 first), your clientside HP will be more than 65k, but the server will keep correcting your HP/Mana everytime you use a skill. The bad thing is that the server value for HP/Mana works as an overflow. So, if you have 66,000 HP and use a skill, your HP will go down to 465 (66k - 65535)