NumberResearch Membership · Data 09/20/2026

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 603
BELL ATLANTIC MOBILE, INC 74
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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2023-07-05 603-919 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 ROCHESTER NH
2022-04-21 603-633 0–9 XXXall 10 · 4 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 MILFORD NH
2021-01-21 603-514 0–9 XXXall 10 · 5 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
2018-10-04 603-519 0–9 XXXall 10 · 5 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 EXETER NH
2017-10-16 603-316 0–9 XXXall 10 · 2 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 MILFORD NH
2016-09-21 603-484 0–9 XXXall 10 · 5 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
2016-01-04 603-404 0–9 XXXall 10 · 4 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 DERRY NH
2013-08-09 603-309 0–9 XXXall 10 · 6 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NEWPORT NH
2012-09-06 603-307 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NO CONWAY NH
2012-09-06 603-402 0–9 XXXall 10 · 4 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
2009-07-06 603-921 0–9 XXXall 10 · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
2009-05-08 603-718 0–9 XXXall 10 · 4 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
2008-07-07 603-933 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 GREENFIELD NH
2008-06-06 603-937 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 MEREDITH NH
2008-01-22 603-960 0XXX1XXX2XXX4XXX8XXX9XXX · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 CAMPTON NH
2007-03-13 603-809 0–9 XXXall 10 · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
2004-12-14 603-831 0–9 XXXall 10 · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 GREENFIELD NH
2004-10-05 603-833 0–9 XXXall 10 · 2 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 ROCHESTER NH
2004-07-28 603-707 0–9 XXXall 10 · 5 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 MEREDITH NH
2003-06-20 603-748 6XXX7XXX8XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 WARNER NH
2002-10-09 603-505 0–9 XXXall 10 · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 DERRY NH
2002-09-12 603-686 0–9 XXXall 10 · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 EXETER NH
2002-08-06 603-568 0–9 XXXwhole prefix which blocks → BELL ATLANTIC MOBILE, INC 6386 CONCORD NH
2002-07-08 603-702 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 KINGSTON NH
2002-05-20 603-790 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 W LEBANON NH
2002-04-19 603-918 1XXX2XXX3XXX4XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 HAMPTON NH
2002-04-19 603-986 0XXX1XXX2XXX3XXX4XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 NO CONWAY NH
2002-02-22 603-530 1XXX4XXX5XXX8XXX · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 BRISTOL NH
2002-02-22 603-660 3XXX4XXX5XXX7XXX · 2 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 GOFFSTOWN NH
2002-02-22 603-915 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 GORHAM NH
2002-02-22 603-991 1XXX6XXX7XXX8XXX9XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 LITTLETON NH
2002-01-22 603-630 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 LACONIA NH
2002-01-22 603-828 0XXX1XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 PORTSMOUTH NH
2001-11-19 603-714 1XXX2XXX3XXX6XXX7XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 BEDFORD NH
2001-10-17 603-370 2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 CANDIA NH
2001-10-17 603-401 2XXX3XXX5XXX6XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 SALEM NH
2001-08-21 603-305 6XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
2001-08-21 603-540 3XXX4XXX6XXX7XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 MANCHESTER NH
2001-08-08 603-508 2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 PELHAM NH
2001-07-11 603-217 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 BRISTOL NH
2001-05-18 603-361 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 MANCHESTER NH
2001-03-16 603-801 5XXX6XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 MILFORD NH
2001-03-09 603-303 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 RAYMOND NH
2001-02-12 603-340 6XXX7XXX8XXX9XXX which blocks → BELL ATLANTIC MOBILE, INC 6386 SUNCOOK NH
— 603-276 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 W LEBANON NH
— 603-312 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 DOVER NH
— 603-315 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 MANCHESTER NH
— 603-318 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
— 603-321 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
— 603-359 not yet reported which blocks → BELL ATLANTIC MOBILE, INC 6386 LEBANON NH

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.