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We study the spectral properties of a diffusion process taking place on the Internet network focusing on the slowest decaying modes. These modes allow us to identify an underlying modular structure of the Internet roughly corresponding to individual countries. For instance in the slowest decaying mode the diffusion current flows from Russia towards US military sites. These two regions thus constitute the extreme edges of the Internet. Quantitatively the modular structure of the Internetdoi:10.1103/physrevlett.90.148701 pmid:12731952 fatcat:2xkcxuadsbhbdeximea2yhxtdi