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.

OCN: 809C INTRADO COMMUNICATIONS, LLC

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
720-405 A Denver CO DNVRCOMA16Z  656      
720-405 0 Denver CO DNVRCOMA16Z  656   2013-10-21   
720-405 1 Denver CO DNVRCOMA16Z  656   2013-10-21   
720-405 2 Denver CO DNVRCOMA16Z  656   2013-10-21   
720-405 3 Denver CO DNVRCOMA16Z  656   2013-10-21   
720-405 4 Denver CO DNVRCOMA16Z  656   2013-10-21   
720-405 5 Denver CO DNVRCOMA16Z  656   2013-10-21   
720-405 6 Denver CO DNVRCOMA16Z  656   2013-10-21   
720-405 7 Denver CO DNVRCOMA16Z  656   2013-10-21   
720-405 8 Denver CO DNVRCOMA16Z  656   2013-10-21   
720-405 9 Denver CO DNVRCOMA16Z  656   2013-10-21   
720-678 0 Denver CO DNVRCOMA16Z  656   2019-11-24   
720-678 1 Denver CO DNVRCOMA16Z  656   2019-11-24   
720-678 8 Denver CO DNVRCOMA16Z  656   2019-11-24   

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

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