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
Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2002-08-12 517-584 not yet reported which blocks → 123.NET, LLC 2550 ALBION MI
2002-08-12 517-609 not yet reported which blocks → 123.NET, LLC 2550 JONESVILLE MI
2002-08-12 517-642 not yet reported which blocks → 123.NET, LLC 2550 MUNITH MI
2002-08-12 517-679 not yet reported which blocks → 123.NET, LLC 2550 LANSING MI
2002-08-12 517-732 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → 123.NET, LLC 2550 PORTLAND MI
2002-08-12 517-762 not yet reported which blocks → 123.NET, LLC 2550 DANSVILLE MI
2002-08-12 517-785 not yet reported which blocks → 123.NET, LLC 2550 ONONDAGA MI
2002-08-12 517-828 not yet reported which blocks → 123.NET, LLC 2550 HILLSDALE MI
2002-08-12 517-873 not yet reported which blocks → 123.NET, LLC 2550 CHARLOTTE MI
2002-08-12 541-551 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BANDON OR
2002-08-12 541-655 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 LANGLOIS OR
2002-08-12 614-408 2XXX3XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J DUBLIN OH
2002-08-12 614-468 1XXX2XXX3XXX5XXX6XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J WORTHINGTN OH
2002-08-12 614-505 2XXX4XXX5XXX9XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K WORTHINGTN OH
2002-08-12 830-865 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SEGUIN TX
2002-08-12 910-808 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 LILLINGTON NC
2002-08-12 910-809 1XXX2XXX4XXX8XXX9XXX · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BLADENBORO NC
2002-08-12 937-591 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD OH
2002-08-12 956-240 not yet reported which blocks → STPCS JOINT VENTURE, LLC 4290 MISSION TX
2002-08-12 956-241 3XXX5XXX7XXX8XXX which blocks → STPCS JOINT VENTURE, LLC 4290 SAN BENITO TX
2002-08-12 989-229 not yet reported which blocks → 123.NET, LLC 2550 CLARE MI
2002-08-12 989-322 not yet reported which blocks → 123.NET, LLC 2550 BAY CITY MI
2002-08-12 989-374 not yet reported which blocks → 123.NET, LLC 2550 MIDLAND MI
2002-08-12 989-410 not yet reported which blocks → 123.NET, LLC 2550 BAD AXE MI
2002-08-12 989-437 not yet reported which blocks → 123.NET, LLC 2550 STANDISH MI
2002-08-12 989-530 not yet reported which blocks → 123.NET, LLC 2550 AKRON MI
2002-08-12 989-568 not yet reported which blocks → 123.NET, LLC 2550 ASHLEY MI
2002-08-12 989-571 not yet reported which blocks → 123.NET, LLC 2550 VASSAR MI
2002-08-12 989-596 not yet reported which blocks → 123.NET, LLC 2550 SAGINAW MI
2002-08-12 989-605 not yet reported which blocks → 123.NET, LLC 2550 AUBURN MI
2002-08-12 989-719 not yet reported which blocks → 123.NET, LLC 2550 CLIFFORD MI
2002-08-12 989-861 not yet reported which blocks → 123.NET, LLC 2550 OSCODA MI
2002-08-12 989-896 not yet reported which blocks → 123.NET, LLC 2550 WESTBRANCH MI
2002-08-09 254-255 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GROESBECK TX
2002-08-09 417-344 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LEBANON MO
2002-08-09 502-250 not yet reported which blocks → WIN.NET TELECOMMUNICATIONS, INC. - KY 3583 BEDFORD KY
2002-08-09 502-746 not yet reported which blocks → WIN.NET TELECOMMUNICATIONS, INC. - KY 3583 BAGDAD KY
2002-08-09 520-265 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 BENSON AZ
2002-08-09 520-266 6XXX9XXX which blocks → T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2002-08-09 573-595 2XXX5XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 EUGENE MO
2002-08-09 603-995 0XXX4XXX5XXX · 3 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 HENNIKER NH
2002-08-09 603-996 3XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 PLYMOUTH NH
2002-08-09 603-997 0XXX7XXX which blocks → METROPCS, INC. 5562 HAMPTON NH
2002-08-09 618-499 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 HARRISBURG IL
2002-08-09 618-713 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CARBONDALE IL
2002-08-09 618-919 2XXX3XXX4XXX5XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 FAIRFIELD IL
2002-08-09 620-652 1XXX5XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - KS 2240 FREDONIA KS
2002-08-09 620-712 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - KS 2240 INMAN KS
2002-08-09 620-869 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - KS 2240 HESSTON KS
2002-08-09 636-290 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 TROY MO

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.