What is the most standard subnet length on internet

[정치영 <lionair () samsung com>]

Hi everyone,

I'm going to rebuild IP allocation policy of my company and I am looking for some standard reference for my policy.
I have already studied some standard like RFC1518, RIPE181, RFC2050 and I got it is very important to maintain hierachy 
structure.
However, what I am really wondering is what is the most standard subnet length that always can be guaranteed through 
Internet. less than /24 bit ?
I could not find any documents about that, which subnet length is most proper value and pursue internet standard policy 
?

Could anyone give me some information guides ?

Best wishes,
Chiyoung
=============================================
 Chi-Young Joung
 SAMSUNG NETWORKS Inc.
 Email: lionair () samsung com
 Tel +82 70 7015 0623, Mobile +82 17 520 9193
 Fax +82 70 7016 0031
=============================================