The question is removed - my mistake.

I'm try to solve in C.

The test #16. Is it coorect value in test?

Expected 3654, got 3554

Sorry, my mistake.

 static int *A;
 A = (int *) malloc (2);
 ...
 return A;

@g964 could you check please

If I just comment out:

...
//free(act); act = NULL;
...

and all tests passed.

I think (probably) thete is some issue in tests code...

I passed 1 test and after I always get error:

*** Error in `/home/codewarrior/solution': munmap_chunk(): invalid pointer: 0x00000000006021b4 ***

OR it to be have to note in description: ...whithout zeros before octet...

123.045.067.089 is valid. Try to $ whois 123.045.067.089 and yo will get:

....
etRange:       123.0.0.0 - 123.255.255.255
CIDR:           123.0.0.0/8
NetName:        APNIC-123
NetHandle:      NET-123-0-0-0-1
Parent:          ()
NetType:        Allocated to APNIC
OriginAS:
Organization:   Asia Pacific Network Information Centre (APNIC)
...