NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

355 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, 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
2023-07-27 803-864 0XXX1XXX2XXX3XXX4XXX9XXX · 5 holders which blocks → ONVOY, LLC - SC 548E SRNGFLSLLY SC
2023-07-27 803-990 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - SC 548E ORANGEBURG SC
2023-07-27 835-223 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PHPHSBZN23 PA
2023-07-27 839-245 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - SC 548E BARNWELL SC
2023-07-27 839-246 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - SC 548E COLUMBIA SC
2023-07-27 929-707 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NWYRCYZN10 NY
2023-07-27 937-961 2XXX which blocks → WABASH MUTUAL TELEPHONE COMPANY - OH 669D GREENVILLE OH
2023-07-26 219-341 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 E CHICAGO IN
2023-07-26 248-490 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRMINGHAM MI
2023-07-26 248-810 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C ROYAL OAK MI
2023-07-26 254-515 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - TX 903C AXTELL TX
2023-07-26 419-820 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C TOLEDO OH
2023-07-26 419-839 0XXX1XXX2XXX3XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC - OH 464C TIFFIN OH
2023-07-26 419-847 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OH 464C SYLVANIA OH
2023-07-26 419-848 0XXX1XXX2XXX3XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC - OH 464C CASTALIA OH
2023-07-26 419-850 0XXX2XXX · 2 holders which blocks → ONVOY, LLC - OH 464C BUTLER OH
2023-07-26 419-854 0XXX2XXX · 2 holders which blocks → ONVOY, LLC - OH 464C LUCAS OH
2023-07-26 470-762 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - GA 067D ATLANTA NW GA
2023-07-26 470-770 1XXX2XXX3XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - GA 067D SOCIALCRCL GA
2023-07-26 470-912 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - GA 067D WINDER GA
2023-07-26 475-335 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CT 639C GREENWICH CT
2023-07-26 478-382 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - GA 067D MACON GA
2023-07-26 561-938 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 BOCA RATON FL
2023-07-26 575-296 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 LAS CRUCES NM
2023-07-26 608-903 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J LA CROSSE WI
2023-07-26 618-970 0XXX2XXX3XXX · 3 holders which blocks → ONVOY, LLC 224C AVA IL
2023-07-26 659-275 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AL 5255 BIRMINGHAM AL
2023-07-26 667-441 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PARKVILLE MD
2023-07-26 681-480 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HNTNGTNZN1 WV
2023-07-26 734-251 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C ANN ARBOR MI
2023-07-26 740-719 0XXX2XXX3XXX4XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 NEWARK OH
2023-07-26 747-209 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VAN NUYS CA
2023-07-26 762-369 2XXX which blocks → ONVOY, LLC - GA 067D WOODLAND GA
2023-07-26 779-374 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 JOLIET IL
2023-07-26 779-375 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JOLIET IL
2023-07-26 835-222 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ALLENTOWN PA
2023-07-26 872-200 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2023-07-26 929-706 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NWYRCYZN04 NY
2023-07-26 934-242 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 RIVERHEAD NY
2023-07-26 945-301 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GRANDPRARI TX
2023-07-26 959-253 0XXX2XXX4XXX5XXX9XXX · 4 holders which blocks → ONVOY, LLC - CT 639C PLAINFIELD CT
2023-07-26 959-254 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CT 639C NORWICH CT
2023-07-26 984-339 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - NC 638E KNIGHTDALE NC
2023-07-25 240-227 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MYERSVILLE MD
2023-07-25 317-812 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - IN 097D FRANKLIN IN
2023-07-25 317-930 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - IN 097D WHITELAND IN
2023-07-25 336-336 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → AT&T - LOCAL 7421 JULIAN NC
2023-07-25 367-404 not yet reported which blocks → Iristel Inc. 154E Quebec —
2023-07-25 437-523 not yet reported which blocks → Iristel Inc. 154E Toronto —
2023-07-25 437-524 not yet reported which blocks → Iristel Inc. 154E Toronto —

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.