Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 579

Fibernetics Corporation 103

New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
2021-08-03	579-517	not yet reported which blocks →	Fibernetics Corporation	464D	St-Remi	—
2021-08-03	579-518	not yet reported which blocks →	Fibernetics Corporation	464D	Ste-Martine	—
2021-07-29	579-513	not yet reported which blocks →	Fibernetics Corporation	464D	Chateauguay	—
2021-07-29	579-514	not yet reported which blocks →	Fibernetics Corporation	464D	Beauharnois	—
2021-07-29	579-519	not yet reported which blocks →	Fibernetics Corporation	464D	Howick	—
2021-01-15	579-418	not yet reported which blocks →	Fibernetics Corporation	464D	Napierville	—
2021-01-15	579-419	not yet reported which blocks →	Fibernetics Corporation	464D	St-Blaise	—
2021-01-14	579-412	not yet reported which blocks →	Fibernetics Corporation	464D	Bedford	—
2021-01-14	579-413	not yet reported which blocks →	Fibernetics Corporation	464D	Clarenceville	—
2021-01-14	579-414	not yet reported which blocks →	Fibernetics Corporation	464D	Farnham	—
2021-01-14	579-415	not yet reported which blocks →	Fibernetics Corporation	464D	Hemmingford	—
2021-01-14	579-416	not yet reported which blocks →	Fibernetics Corporation	464D	Henryville	—
2021-01-14	579-417	not yet reported which blocks →	Fibernetics Corporation	464D	Lacolle	—
2021-01-12	579-464	not yet reported which blocks →	Fibernetics Corporation	464D	St-Calixte-de-Kilkenny	—
2021-01-12	579-465	not yet reported which blocks →	Fibernetics Corporation	464D	St-Hippolyte	—
2021-01-12	579-466	not yet reported which blocks →	Fibernetics Corporation	464D	St-Lin	—
2021-01-11	579-455	not yet reported which blocks →	Fibernetics Corporation	464D	St-Alphonse-de-Rodriguez	—
2021-01-11	579-456	not yet reported which blocks →	Fibernetics Corporation	464D	St-Barthelemy	—
2021-01-11	579-457	not yet reported which blocks →	Fibernetics Corporation	464D	Ste-Julienne	—
2021-01-11	579-458	not yet reported which blocks →	Fibernetics Corporation	464D	St-Felix-de-Valois	—
2021-01-11	579-459	not yet reported which blocks →	Fibernetics Corporation	464D	St-Gabriel-de-Brandon	—
2021-01-11	579-460	not yet reported which blocks →	Fibernetics Corporation	464D	St-Jacques	—
2021-01-11	579-461	not yet reported which blocks →	Fibernetics Corporation	464D	St-Jean-de-Matha	—
2021-01-11	579-462	not yet reported which blocks →	Fibernetics Corporation	464D	St-Michel-des-Saints	—
2021-01-11	579-463	not yet reported which blocks →	Fibernetics Corporation	464D	St-Zenon	—
2020-11-13	579-676	not yet reported which blocks →	Fibernetics Corporation	464D	St-Cesaire	—
2020-11-13	579-677	not yet reported which blocks →	Fibernetics Corporation	464D	Sutton	—
2020-11-13	579-678	not yet reported which blocks →	Fibernetics Corporation	464D	Waterloo	—
2020-11-12	579-674	not yet reported which blocks →	Fibernetics Corporation	464D	Bromont	—
2020-11-12	579-675	not yet reported which blocks →	Fibernetics Corporation	464D	Dunham	—
2020-06-26	579-572	not yet reported which blocks →	Fibernetics Corporation	464D	Marieville	—
2020-06-26	579-573	not yet reported which blocks →	Fibernetics Corporation	464D	Varennes	—
2020-06-25	579-570	not yet reported which blocks →	Fibernetics Corporation	464D	Cowansville	—
2020-06-25	579-571	not yet reported which blocks →	Fibernetics Corporation	464D	Knowlton	—
2020-04-07	579-333	not yet reported which blocks →	Fibernetics Corporation	464D	St-Marc	—
2016-01-28	579-377	not yet reported which blocks →	Fibernetics Corporation	464D	Joliette	—
2016-01-28	579-378	not yet reported which blocks →	Fibernetics Corporation	464D	Ste-Therese	—
2015-11-10	579-380	not yet reported which blocks →	Fibernetics Corporation	464D	Granby	—
2015-11-10	579-381	not yet reported which blocks →	Fibernetics Corporation	464D	St-Jean	—
2015-09-25	579-887	not yet reported which blocks →	Fibernetics Corporation	464D	St-Jerome	—
2012-10-19	579-279	not yet reported which blocks →	Fibernetics Corporation	464D	Ste-Rose	—
2012-10-19	579-379	not yet reported which blocks →	Fibernetics Corporation	464D	Laval-Ouest	—
2012-10-19	579-578	not yet reported which blocks →	Fibernetics Corporation	464D	St-Vincent-de-Paul	—
2012-10-19	579-679	not yet reported which blocks →	Fibernetics Corporation	464D	Chomedey	—
2012-10-19	579-779	not yet reported which blocks →	Fibernetics Corporation	464D	Pont-Viau	—
2012-10-19	579-979	not yet reported which blocks →	Fibernetics Corporation	464D	Laval-Est	—
2012-10-15	579-881	not yet reported which blocks →	Fibernetics Corporation	464D	Longueuil	—
2012-10-15	579-884	not yet reported which blocks →	Fibernetics Corporation	464D	St-Bruno	—
2012-10-12	579-880	not yet reported which blocks →	Fibernetics Corporation	464D	St-Lambert	—
2012-10-12	579-882	not yet reported which blocks →	Fibernetics Corporation	464D	Boucherville	—

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.