Ownership of Routers on Both Ends of Transnational Links

[randy at psg.com (Randy Bush)]

i suspect the OP is down the rabbit hole of what is known as
"anti-aliasing," trying to find out whether IP address A on some router
is actually on the same router as IP address B, and what AS(s) those IPs
are in.  your point is that an inter-as link may have IPs from either of
the providers.  yup.  and, because it is an INTER-as link, it does not
really belong to one or t'other.

this particular rabbit digs deep holes.  an early entrance to the burrow
is the classic from the uw crew

inproceedings{Spring:2002:MIT:633025.633039,
 author = {Spring, Neil and Mahajan, Ratul and Wetherall, David},
 title = {Measuring ISP Topologies with Rocketfuel},
 booktitle = {Proceedings of the 2002 Conference on Applications, Technologies, Architectures, and Protocols for Computer Communications},
 series = {SIGCOMM '02},
 year = {2002},
 isbn = {1-58113-570-X},
 location = {Pittsburgh, Pennsylvania, USA},
 pages = {133--145},
 numpages = {13},
 url = {http://doi.acm.org/10.1145/633025.633039},
 doi = {10.1145/633025.633039},
 acmid = {633039},
 publisher = {ACM},
 address = {New York, NY, USA},
} 

randy