time ./trie_overlap.pl <50k_ips

...

'116.15.84.0/23' is contained by or equals '116.14.0.0/15'
'108.245.172.0/24' is contained by or equals '108.244.0.0/14'
'13.238.173.128/25' is contained by or equals '13.224.0.0/11'
'37.179.224.0/19' is contained by or equals '37.179.192.0/18'
'73.147.0.0/17' is contained by or equals '73.144.0.0/12'
'150.152.0.0/13' contains '150.154.0.0/18'
'171.93.16.0/22' is contained by or equals '171.0.0.0/9'
'80.246.128.0/21' is contained by or equals '80.240.0.0/13'

real    0m1.957s
user    0m1.832s
sys     0m0.124s