Where's ?

John R Levine wrote

Where's ?

Got a spam advertising a web page there, ARIN claims it's not allocated
although all the space around it is. It routes through Tierranet.

TierraNet (ASN 10732) is advertising, which includes (ns1.netcolony.com). ARIN reports that they've only
been allocated and that the other half of the /19
that they're announcing ( is unallocated.

Perhaps ARIN has reserved the entire /19 for TierraNet, but only
actually allocated the lower /20 to them? Perhaps TierraNet is
announcing their /20 as a /19 to get past Sprint's route filters?