NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

355 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, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
— 251-452 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-454 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-455 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-456 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-457 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-458 not yet reported which blocks → ELISKA WIRELESS VENTURES SUBSIDIARY I, LLC 6916 MOBILE AL
— 251-459 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-460 1XXX3XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-461 6XXX8XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-463 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-470 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-471 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-472 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-473 0XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-476 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-478 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-479 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-487 3XXX4XXX5XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 MOBILE AL
— 251-490 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-494 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AL 5255 BAYMINETTE AL
— 251-504 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 FOLEY AL
— 251-508 0–9 XXXall 10 · 2 holders which blocks → ELISKA WIRELESS VENTURES SUBSIDIARY I, LLC 6916 MOBILE AL
— 251-509 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AL 8271 MOBILE AL
— 251-510 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AL
— 251-513 1XXX2XXX3XXX4XXX5XXX6XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 MOBILE AL
— 251-518 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 MOBILE AL
— 251-525 2XXX5XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 MOBILE AL
— 251-533 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 MOBILE AL
— 251-540 not yet reported which blocks → BRIGHTSPEED OF SOUTHERN ALABAMA 0298 FOLEY AL
— 251-542 not yet reported which blocks → MILLRY TEL. CO. 0304 SILAS AL
— 251-543 2XXX3XXX5XXX9XXX which blocks → BRIGHTSPEED OF SOUTHERN ALABAMA 0298 FOLEY AL
— 251-544 not yet reported which blocks → PAETEC ITEL, LLC 829J MOBILE AL
— 251-554 not yet reported which blocks → ELISKA WIRELESS VENTURES SUBSIDIARY I, LLC 6916 MOBILE AL
— 251-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST AL
— 251-564 0XXX which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 PETERMAN AL
— 251-568 not yet reported which blocks → SPOK, INC. 6630 MOBILE AL
— 251-574 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-575 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 MONROEVL AL
— 251-577 0XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 4464 MCCULLOUGH AL
— 251-578 none assigned yet which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 EVERGREEN AL
— 251-580 6XXX7XXX9XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 BAYMINETTE AL
— 251-581 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → SOUTHERN COMMUNICATIONS SERVICES, INC. 6744 MOBILE AL
— 251-582 not yet reported which blocks → SPOK, INC. 6630 MOBILE AL
— 251-583 none assigned yet which blocks → METROPCS, INC. 5562 MOBILE AL
— 251-586 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J MOBILE AL
— 251-589 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JACKSON AL
— 251-591 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-593 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MONROEVL AL
— 251-597 1XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 FOLEY AL

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.