1.多網段情況下：
select ip,
to_number(substr(ip,1,instr(ip,'.',1,1)-1)) as newip1,
to_number(substr(ip,instr(ip,'.',1,1)+1,instr(ip,'.',1,2)-instr(ip,'.',1,1)-1)) as newip2,
to_number(substr(ip,instr(ip,'.',1,2)+1,instr(ip,'.',1,3)-instr(ip,'.',1,2)-1)) as newip3,
to_number(substr(ip,instr(ip,'.',1,3)+1,length(ip)+1-instr(ip,'.',1,3))) as newip4
from itemfound
order by newip1,newip2,newip3,newip4
2. 單個網段情況下：
select ip,
to_number(substr(ip,instr(ip,'.',1,3)+1,length(ip)+1-instr(ip,'.',1,3))) as newip4
from itemfound
order by newip4
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