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$ cat pm_11137097_csv_parse.csv
A,B,IP0,C,D,URL0,E,F
...
A,B,IP0,C,D,URL7,E,F
A,B,IP1,C,D,URL8,E,F
A,B,IP0,C,D,URL9,E,F

#!/usr/bin/env perl

...
}

dd \%urls_for_ip;

{
  IP0 => ["URL0", "URL7", "URL9"],
...
  IP3 => ["URL3"],
  IP9 => ["URL4"],
}