North American Telecom Routing Reference
Comprehensive NPA/NXX data, carrier assignments, and rate center information.
Updated daily from NANPA and live carrier data.
NPA/NXX assignments, carrier data, rate centers, and state-level rollups. The core data that powers telecom routing decisions.
Browse reference →Deep technical articles on how telecom routing works, numbering plans, SIP and SS7 protocols, and network infrastructure.
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