- HFIXEDSZ
Size of the header
- INT16SZ
Size of a short int
- INT32SZ
Size of an int 32 bit
- PACKETSZ
Packet
size in bytes
- QFIXEDSZ
Size of the question portion (type and class)
- RRFIXEDSZ
Size of an RR
portion (type,class,lenght and ttl)
- VERSION
The current library version.