NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
2019-04-02 343-253 not yet reported which blocks → TELUS Integrated Communications 2782 Coe Hill —
2019-04-02 539-228 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CSC WIRELESS, LLC 425J GROVE OK
2019-04-02 580-414 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → CSC WIRELESS, LLC 425J WEATHERFD OK
2019-04-02 825-359 not yet reported which blocks → Bell West Inc. 2933 Rocky Mountain House —
2019-04-02 838-209 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → VALSTAR, INC. - NY 9073 CLAVERACK NY
2019-04-02 907-606 0XXX1XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS 6563 WILLOW AK
2019-04-02 909-712 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REDLANDS CA
2019-04-01 207-559 0XXX1XXX2XXX5XXX6XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - ME 882G LINCOLN ME
2019-04-01 325-273 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J SWEETWATER TX
2019-04-01 361-363 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J VICTORIA TX
2019-04-01 430-271 0–9 XXXall 10 · 6 holders which blocks → CSC WIRELESS, LLC 425J GLADEWATER TX
2019-04-01 432-256 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J MIDLAND TX
2019-04-01 469-722 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J DALLAS TX
2019-04-01 506-890 not yet reported which blocks → TELUS Mobility 8303 Tracadie —
2019-04-01 512-884 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J AUSTIN TX
2019-04-01 530-606 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J TRUCKEE CA
2019-04-01 707-719 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J BLUE LAKE CA
2019-04-01 806-646 0–9 XXXall 10 · 2 holders which blocks → CSC WIRELESS, LLC 425J AMARILLO TX
2019-04-01 806-705 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J LUBBOCK TX
2019-04-01 873-355 not yet reported which blocks → Bell Mobility 6574 Ottawa-Hull —
2019-04-01 979-290 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J BRENHAM TX
2019-03-29 380-205 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 NEW ALBANY OH
2019-03-29 614-967 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 DUBLIN OH
2019-03-29 640-837 0–9 XXXall 10 · 4 holders which blocks → CORETEL NEW JERSEY, INC. - NJ 482F CAPMAYCTHS NJ
2019-03-29 646-993 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2019-03-29 647-582 not yet reported which blocks → Bell Mobility 6574 Toronto —
2019-03-29 647-583 not yet reported which blocks → Bell Mobility 6574 Toronto —
2019-03-29 647-585 not yet reported which blocks → Bell Mobility 6574 Toronto —
2019-03-29 662-881 0–9 XXXall 10 · 2 holders which blocks → CSC WIRELESS, LLC 425J GREENWOOD MS
2019-03-29 716-576 0–9 XXXall 10 · 4 holders which blocks → CITIZENS TELECOMM CO OF NY DBA FRONTIER COMM OF NY 0096 SANBORN NY
2019-03-29 803-922 0–9 XXXall 10 · 3 holders which blocks → TERRA NOVA TELECOM INC. 145J COLUMBIA SC
2019-03-29 864-773 1XXX2XXX3XXX4XXX5XXX7XXX · 5 holders which blocks → SOUTH CAROLINA NET, INC. - SC 1784 TROY SC
2019-03-28 239-420 0–9 XXXwhole prefix which blocks → ONVOY, LLC - FL 937C MARCO IS FL
2019-03-28 252-350 0–9 XXXall 10 · 2 holders which blocks → CSC WIRELESS, LLC 425J PINETOPS NC
2019-03-28 318-691 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J MINDEN LA
2019-03-28 321-306 0–9 XXXall 10 · 4 holders which blocks → METROPCS NETWORKS, LLC 899D MELBOURNE FL
2019-03-28 337-549 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J LK CHARLES LA
2019-03-28 352-632 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - FL 937C BEVERLYHLS FL
2019-03-28 352-635 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - FL 937C CEDAR KEYS FL
2019-03-28 352-645 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - FL 937C KEYSTN HTS FL
2019-03-28 352-646 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - FL 937C OLD TOWN FL
2019-03-28 412-743 0–9 XXXwhole prefix which blocks → ONVOY, LLC - PA 547E CLAIRTON PA
2019-03-28 417-412 0–9 XXXall 10 · 2 holders which blocks → CSC WIRELESS, LLC 425J BRANSON MO
2019-03-28 434-278 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F PINEYRIVER VA
2019-03-28 475-257 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J NORWALK CT
2019-03-28 501-338 1XXX2XXX3XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 BISMARCK AR
2019-03-28 501-356 0–9 XXXall 10 · 6 holders which blocks → CSC WIRELESS, LLC 425J JESSIEVL AR
2019-03-28 501-357 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 DONALDSON AR
2019-03-28 571-600 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J DULLESMTRO VA
2019-03-28 571-833 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MANASSAS VA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.