29 May
2012
29 May
'12
10:34 a.m.
On Mon, May 28, 2012 at 06:56:29PM -0500, Brett Frankenberger <rbf+nanog@panix.com> wrote a message of 15 lines which said:
How does your employer know if two nameservers (two IP addresses) are on the same subnet?
The current heuristic for IPv4 is "belongs in the same /28" (and /64 for IPv6). Otherwise, Mark Andrews is right, we should use a BGP feed but it would be complicated for a command-line tool.