Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • 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.

NPA: 856 [Rate centres in NPA 856] [Dial plan for NPA 856]

NXX: 818

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
856-818 A Williamstown NJ PRTNNJ312MD  4804 LEVEL 3 COMMUNICATIONS, LLC - NJ 222      
856-818 0 Williamstown NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2016-01-21   
856-818 1 Williamstown NJ PRTNNJ312MD  4804 LEVEL 3 COMMUNICATIONS, LLC - NJ 222      
856-818 2 Williamstown NJ CMDNNJCEXRY  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2016-01-08   
856-818 3 Williamstown NJ LRSPNJLSFMD  118F BANDWIDTH.COM CLEC, LLC - NJ 222   2014-03-14   
856-818 4 Williamstown NJ LRSPNJLSFMD  118F BANDWIDTH.COM CLEC, LLC - NJ 222   2014-03-14   
856-818 5 Williamstown NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2016-04-29   
856-818 6 Williamstown NJ CMDNNJCEXRY  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2015-10-20   
856-818 7 Williamstown NJ CMDNNJCEXRY  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2014-09-10   
856-818 8 Williamstown NJ CMDNNJCEXRY  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2013-12-09   
856-818 9 Williamstown NJ CMDNNJCE58Z  318J COMCAST IP PHONE, LLC 222   2015-09-24   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.