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
2023-08-01 385-548 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
2023-08-01 419-888 0XXX2XXX4XXX8XXX · 3 holders which blocks → ONVOY, LLC - OH 464C GALION OH
2023-08-01 438-453 not yet reported which blocks → Bell Mobility 6574 Montreal —
2023-08-01 447-261 0XXX1XXX2XXX · 3 holders which blocks → ONVOY, LLC 224C PLEASANTPL IL
2023-08-01 472-225 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NC 638E LAURINBURG NC
2023-08-01 516-347 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC- NY 384C NASSAUZN09 NY
2023-08-01 548-578 not yet reported which blocks → ISP Telecom Inc. 4727 St. Jacobs —
2023-08-01 548-647 not yet reported which blocks → ISP Telecom Inc. 4727 Dorchester —
2023-08-01 548-813 not yet reported which blocks → ISP Telecom Inc. 4727 Glencoe —
2023-08-01 561-940 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - FL 937C BOCA RATON FL
2023-08-01 561-942 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - FL 937C BELLEGLADE FL
2023-08-01 629-287 0XXX1XXX7XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J ADMSCDARHL TN
2023-08-01 753-206 not yet reported which blocks → ISP Telecom Inc. 4727 Bourget —
2023-08-01 753-312 not yet reported which blocks → ISP Telecom Inc. 4727 Manotick —
2023-08-01 753-528 not yet reported which blocks → ISP Telecom Inc. 4727 Metcalfe —
2023-08-01 878-707 0XXX1XXX7XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H MARION CTR PA
2023-08-01 878-744 0XXX4XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H MCLELANDTN PA
2023-08-01 878-780 0XXX which blocks → ONVOY SPECTRUM, LLC 624H CLYMER PA
2023-08-01 878-808 8XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H FAIRCHANCE PA
2023-08-01 878-840 0XXX1XXX2XXX8XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H NEW SALEM PA
2023-08-01 878-868 0XXX6XXX8XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H NEWFLORNCE PA
2023-08-01 878-878 1XXX7XXX8XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H NEWBEDFORD PA
2023-08-01 878-988 0XXX8XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H PT MARION PA
2023-08-01 918-880 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 JENKS OK
2023-08-01 936-335 0–9 XXXwhole prefix which blocks → CONSOLIDATED COMMUNICATIONS OF TEXAS COMPANY 2109 CONROE TX
2023-08-01 984-340 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NC 638E DURHAM NC
2023-07-31 431-323 not yet reported which blocks → Bell Mobility 6574 Winnipeg —
2023-07-31 548-287 not yet reported which blocks → ISP Telecom Inc. 4727 Merlin —
2023-07-31 548-314 not yet reported which blocks → ISP Telecom Inc. 4727 Ridgetown —
2023-07-31 548-462 not yet reported which blocks → ISP Telecom Inc. 4727 Thamesville —
2023-07-31 548-509 not yet reported which blocks → ISP Telecom Inc. 4727 Plattsville —
2023-07-31 618-730 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H OLNEY IL
2023-07-31 709-714 not yet reported which blocks → Bell Mobility Aliant 329A Carbonear —
2023-07-31 747-213 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CANOGAPARK CA
2023-07-31 786-960 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MIAMI FL
2023-07-31 845-996 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CONGERS NY
2023-07-31 873-456 not yet reported which blocks → Bell Mobility 6574 Ottawa-Hull —
2023-07-28 224-468 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELGIN IL
2023-07-28 225-506 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BATONROUGE LA
2023-07-28 229-480 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 THOMASVL GA
2023-07-28 234-216 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - OH 464C SALEM OH
2023-07-28 272-272 0XXX1XXX2XXX3XXX4XXX7XXX · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H TROUT RUN PA
2023-07-28 272-702 0XXX2XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H MONTGOMERY PA
2023-07-28 272-720 0XXX1XXX2XXX3XXX9XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H WEATHERLY PA
2023-07-28 334-903 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 DOTHAN AL
2023-07-28 346-684 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C SATSUMA TX
2023-07-28 413-488 0XXX2XXX which blocks → ONVOY, LLC - MA 892D BELCHERTN MA
2023-07-28 419-856 0XXX2XXX · 2 holders which blocks → ONVOY, LLC - OH 464C WAYNESFLD OH
2023-07-28 472-224 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 LAURINBURG NC
2023-07-28 512-325 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C LEANDER TX

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.