Any routing table created would look different from the perspective of different routers, even if a stable view could be achieved.
[2] The term "default-free zone" is sometimes confused with an "Internet core" or Internet backbone, but there has been no true "core" since before the Border Gateway Protocol (BGP) was introduced.
At best, today's definition of the Internet core is statistical, with the "skitter core" being some number of AS with the greatest traffic according to the CAIDA measurements, previously made with its measuring tool called "skitter".
While it is slightly difficult to point to a precise endpoint, NSF funding for transmission ceased by 1998.
Especially if there is more than one router connected to the same ISP, a common practice, it will receive more routes than are in the DFZ.