Magic Banana lamented, "You attached an input but still no expected output."
... and then jumped to the conclusion, " Assuming you again want to extract
the IPV4 addresses..."
While that's the long-term (end of next week ...) goal, the immediate concern
is to find a reliable script to
separate the painfully obvious IPv4 addresses, not from the bodies of the
PTR's, but from the list of them. My
subterfuge of switching from the dot '.' separator to the $ separator for the
fifth column at least cleans up
the visual aspect of the sorting problem. The output of that script flags the
fourth octets of the proper IPv4
addresses with a trailing dollar sign.
I assumed that the 2nd script would provide its own answer, as it's laden
with 53 unintended IPv4 consequences.
The 1st script's output is 100% IPv6 addresses, with no stowaways. The
NoIPv6-List.txt file has PTR's with
glaringly obvious IPv6 origins, but no actual IPv6 addresses that you could
resolve with dig -x, plus one IPv4
leftover.
Those IPv4 and IPv6 addresses that I'm trying to cut out of the herd are
special, because they weren't looked
up by that apache hostname-lookup option (which to apache's credit is
deprecated in their instructions), because
the associated server was unavailable or misconfigured. Now I want to see
what else is doing on those servers, a
few weeks or months later.
Once the heifers have been separated from the bulls, then the ensuing tasks
are a little easier. Analyzing the
contents of the near-infinite address spaces of IPv6 CIDR blocks is best
addressed by Magic Banana's random-
selection of IPv6 addresses to be searched with nMap scripts, whereas the
very cramped space of IPv4 CIDR
blocks can be addressed by inquiring with more direct scripts.
Finding those multi-addressed hostnames in the outputs of scripts that
provide answers in CPU time scales is a
huge step forward compared to nosing around, one hostname at a time, for the
finite data gathered by a few
Internet watchdogs that is agglomerated in the near-infinite data hoarded by
Google. The geek definitely is on
a better track than the uneducated plodder.
George Langford
