After composing yet another chapter in this treatise and then losing it after
an errant pinkie brushed across the
freeze-the-system key, I'm starting over to find a way of finishing the
hostname-resolution process:
There are three methods of resolving hostnames:
1. Magic Banana's technique of extracting the four octets of a candidate IPv4
address and then testing three different
permutations of those octets by performing nMap scans, with some
postprocessing added in line:
time tr -sc 0-9\\n ' ' < CPV-GB-OneCol0-6192019.txt | awk '{ k = 0; for (i =
0; k < 4 && ++i CPV-MB-answers-noNS-Rev-Supplemental-Output-Sorted.txt
Takes fifty-four seconds ... all the answers as well as the interlopers, but
IPv4's have to be extracted from the ARPA data.
Note that dig -f will not return the PTR records of the candidate IPv4
addresses unless there's an "-x " in front of each of
the three permutations of the extracted four octets in Magic Banana's portion
of this script that are then sent to dig -f.
Process the ARPA list:
time tr -sc 0-9\\n ' ' < CPV-ARPA-list.txt | awk '{ k = 0; for (i = 0; k < 4
&& ++i Sorted on the candidate hostname list and then compared manually to
the original list
of hostnames gathered from a single morning's Recent Visitors.
B. CPV-ThreeMethods-06222019-sort.ods ==> Sorted on the search method, with
dig first, then nMap and finally NSL.
C. CPV-ThreeMethods-06222019-Yes.ods ==> Sorted on the outcomes of the
searches, with successful (Y) first. "O" indicates names
that are outside of the scope of the present scripts, but which can be found
easily on the Internet.
And here''s the scorecard: CPV-GB-OneCol0-6192019-Resolved-Sort.ods ==>
Three hostnames that should have been found with Magic
Banana's script were somehow missed ("None ?). All the rest of the hostnames
were resolved by one or more of the three methods.
Of course, the bare IPv4 addresses at the bottom of this last table are
easily fleshed out with whois, then their CIDR blocks,
and lastly, the list of CIDR blocks within their Autonomous System, which is
what I planto do with the resolved IPv4 addresses
in order to find the multiply duplicated PTR records which otherwise hide
those IPv4 addresses from scrutiny.
