San Jose, CA
·Pacific Bell - SBC
Are you referring to the "ATT 188.8.131.52" hop? That IP address actually belongs to Level 3. However, to answer your question, AT&T uses "MultiProtocol Label Switching" ("MPLS") on their routes. That may actually be a port on AT&T hardware, and there is no telling why it lacks a proper FQDN ("Fully Qualified Domain Name"). In any case, this is an AT&T DSL user-to-user self-help forum. There are likely only a small handful of AT&T DSL users who know what happens on the AT&T Tier 1 transit network.
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum