Hello Gisle,

thanks for your mail.

> This flag 'LOC_NETWORK_FLAG_BOGON' does not exist (yet).
> Would it be possible? 

In theory, yes, but there is no need for another flag: If there is
is no announcement for a network, it is considered to be a bogon.

So, all you need to do is to check if loc_database_lookup() gives
you an ASN for the queried IP address. :-)

> And is there any relationship between a "Bogon" and
> 'LOC_NETWORK_FLAG_DROP' flag? 

Not really. Some bogons might get that flag as well, if they appear
at Spamhaus DROP (which will be our primary source for LOC_NETWORK_FLAG_DROP);
see https://www.spamhaus.org/sbl/query/SBL504836 for an example.

So, there might be some overlap in practice, but these are not 
inherently related to each other.

Thanks, and best regards,
Peter Müller