Local Calling Guide

Area code/prefix search

Search by area code/prefix (NPA/NXX) or OCN

NPA: NXX: Block: OCN: Region: LATA: Switch: Effective date within past or next days

Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Error: NPA must be between 201 and 999.