Index fragment question

Hello,
I run the following to find tables/indexes fragmentation and I get the following output. It shows the Max extents and # extents >100. How do I interpret that, do I have to rebuild indexes or what is the correct way, how much should the max extents / #extents be usually? how to go about fixing this ? I hope you can provide inputs .

select a.owner "Owner",
segment_name "Name",
segment_type "Type",
bytes/(1024*1024) "Size (MB)",
max_extents "Max Extents",
extents "# Extents"
from dba_segments a
where segment_type in ('TABLE','INDEX')
and a.owner not in ('SYS','SYSTEM','OUTLN','MDSYS','ORDSYS','CSMIG','AURORA$JIS$UTILITY$','DBSNMP')
and extents > 100
and rownum <= 20
order by 5 desc

Owner Name Size(MB) Max Extents #Extents
------------------------------ ---------------------------------------------------------
QP QP_DEBUG_REQ_LDETS_N2 9.53125 2147483645 243
CZ CZ_CONFIG_ATTRIBUTES 165.585938 2147483645 224
CZ CZ_CONFIG_ITEMS_PK 900.039063 505 181
CZ CZ_CONFIG_INPUTS_PK 530.039063 505 107

how on earth has that query got anything to do with fragmentation?

it just lists the number of extents

Yes, so, what is the ideal number to arrive at. what should the number be ?
if according to the query and extents > 100, is that a problem and they all should be < 100 ? how to detrmine the number ?

hundreds of thousands - so forget about it