Tier 1 backbone · AS7018 · United States
SUN · 26 JUL 2026
AT&T
About this network
AT&T operates AS7018 as its core IP backbone. The network is one of the oldest still in service (descended from the original BBN-built ARPANET). Among the few US carriers with both retail and Tier 1 transit at scale.
Notable
Direct lineage to ARPANET-era backbones. One of the oldest Tier 1 ASes still operating.