ISC uses an unusual routing configuration for the F-Root name server. While the configuration is relatively easy to understand, it's hard to deduce by looking at the routing tables. We'll explain it here!
The network 188.8.131.52/23 is used for F-Root. The reasons for using this block are historical and unimportant, but the fact that it is a /23 is very important. Looking in the global routing table, you'll find 184.108.40.206/23 routed worldwide; ISC has obtained multiple transit providers for this network to provide excellent access to F-Root.
There is nothing more sensational than the unexpected, and when the NANOG (North American Network Operators Group) community was recently informed that an ASN collision had occurred it caused a lot of people to sit up and take notice. This event was also very interesting in that researching takes us back to a time before ARIN and RIPE existed, creating an interesting historical twist.