Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 571

TELEPORT COMMUNICATIONS AMERICA, LLC - DC 23

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
2026-04-30	571-757	0–9 XXXall 10 · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN19	VA
2025-05-05	571-726	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN08	VA
2024-02-26	571-630	0–9 XXXall 10 · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN17	VA
2023-10-19	571-801	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	ENGLESIDE	VA
2023-10-19	571-802	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	ENGLESIDE	VA
2023-10-19	571-803	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	ENGLESIDE	VA
2023-10-19	571-804	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	ENGLESIDE	VA
2023-10-19	571-805	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	ENGLESIDE	VA
2023-10-19	571-820	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	ENGLESIDE	VA
2023-10-19	571-821	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	ENGLESIDE	VA
2023-10-19	571-822	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	ENGLESIDE	VA
2023-10-19	571-823	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	ENGLESIDE	VA
2023-10-19	571-824	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	ENGLESIDE	VA
2023-05-05	571-638	0–9 XXXall 10 · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	HERNDON	VA
2023-04-26	571-637	0–9 XXXall 10 · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN08	VA
2021-04-27	571-507	0–9 XXXall 10 · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN17	VA
2020-12-24	571-476	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN19	VA
2020-12-24	571-566	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN19	VA
2018-06-08	571-391	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN19	VA
2008-11-13	571-354	0–9 XXXall 10 · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN19	VA
2007-09-04	571-766	0–9 XXXall 10 · 6 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN17	VA
2007-02-23	571-303	0–9 XXXall 10 · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN08	VA
—	571-227	not yet reported which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN08	VA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.