NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 251
MCC TELEPHONY OF THE SOUTH, LLC - AL 17
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
2024-08-08 251-488 8XXX9XXX · 2 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F CASTLEBRY AL
2016-12-07 251-312 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F REPTON AL
2012-07-16 251-262 0–9 XXXall 10 · 6 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F JACKSON AL
2010-12-16 251-600 0–9 XXXall 10 · 3 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F FOLEY AL
2010-11-29 251-500 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F FOLEY AL
2010-05-20 251-299 0–9 XXXall 10 · 7 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F MT VERNON AL
2010-05-20 251-306 0–9 XXXall 10 · 5 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F IRNGTNSTEL AL
2010-05-04 251-314 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F BREWTON AL
2008-11-18 251-290 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F GRAND BAY AL
2008-01-31 251-271 0–9 XXXall 10 · 3 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F FOLEY AL
2007-02-06 251-240 0–9 XXXall 10 · 7 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F FOLEY AL
2007-02-06 251-256 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F FOLEY AL
2007-02-02 251-324 0–9 XXXall 10 · 3 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F FOLEY AL
2007-02-02 251-677 0–9 XXXall 10 · 3 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F FOLEY AL
2006-05-11 251-322 0–9 XXXall 10 · 5 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F ATMORE AL
2003-08-21 251-224 0–9 XXXall 10 · 3 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F FOLEY AL
— 251-357 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F HUXFORD AL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.