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
2023-05-15 931-390 3XXX which blocks → ONVOY SPECTRUM, LLC 624H CUNNINGHAM TN
2023-05-15 931-396 0XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TN 4806 JAMESTOWN TN
2023-05-15 931-399 0XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H ELKTON TN
2023-05-15 931-630 0XXX3XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H FREDONIA TN
2023-05-15 931-690 0XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H MTPLEASANT TN
2023-05-15 931-930 3XXX which blocks → ONVOY SPECTRUM, LLC 624H WARTRACE TN
2023-05-12 252-576 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J GREENVILLE NC
2023-05-12 341-232 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C HAYWARD CA
2023-05-12 548-293 not yet reported which blocks → Iristel Inc. 154E Walkerton —
2023-05-12 548-501 not yet reported which blocks → Iristel Inc. 154E Tillsonburg —
2023-05-12 548-582 not yet reported which blocks → Iristel Inc. 154E Sarnia —
2023-05-12 548-586 not yet reported which blocks → Iristel Inc. 154E St. Thomas —
2023-05-12 561-850 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 WPALMBEACH FL
2023-05-12 606-321 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CORBIN KY
2023-05-12 607-456 1XXX2XXX · 2 holders which blocks → ARMSTRONG TELECOMMUNICATIONS, INC. - NY 421C ADDISON NY
2023-05-12 725-302 0–9 XXXwhole prefix which blocks → ONVOY, LLC - NV 029F LAS VEGAS NV
2023-05-12 828-714 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 HENDERSNVL NC
2023-05-11 346-657 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CYPRESS TX
2023-05-11 346-658 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RICHMNRNBG TX
2023-05-11 365-286 not yet reported which blocks → Iristel Inc. 154E Kleinburg —
2023-05-11 365-513 not yet reported which blocks → Iristel Inc. 154E Bowmanville —
2023-05-11 464-215 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FOREST IL
2023-05-11 464-216 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OAK FOR SO IL
2023-05-11 548-290 not yet reported which blocks → Iristel Inc. 154E Durham —
2023-05-11 548-325 not yet reported which blocks → Iristel Inc. 154E Listowel —
2023-05-11 548-406 not yet reported which blocks → Iristel Inc. 154E Essex —
2023-05-11 548-505 not yet reported which blocks → Iristel Inc. 154E Owen Sound —
2023-05-11 548-584 not yet reported which blocks → Iristel Inc. 154E Orangeville —
2023-05-11 641-302 0XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J RHODES IA
2023-05-11 712-440 0XXX1XXX4XXX5XXX8XXX · 4 holders which blocks → ONVOY, LLC - IA 221F PETERSON IA
2023-05-11 712-457 0XXX2XXX which blocks → ONVOY, LLC - IA 221F PIERSON IA
2023-05-11 902-267 not yet reported which blocks → Iristel Inc. 154E Caledonia —
2023-05-11 912-719 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 HINESVILLE GA
2023-05-11 947-231 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRMINGHAM MI
2023-05-10 239-457 0–9 XXXall 10 · 3 holders which blocks → HADLO TECHNOLOGIES, LLC 436J FORT MYERS FL
2023-05-10 352-790 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H LADY LAKE FL
2023-05-10 431-340 not yet reported which blocks → Iristel Inc. 154E Portage La Prairie —
2023-05-10 709-384 not yet reported which blocks → TELUS Mobility 8303 Hare Bay —
2023-05-10 709-385 not yet reported which blocks → TELUS Mobility 8303 Lewisporte —
2023-05-10 709-386 not yet reported which blocks → TELUS Mobility 8303 Port Aux Basques —
2023-05-10 731-477 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H MEDINA TN
2023-05-10 731-533 0XXX3XXX5XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H PALMERSVL TN
2023-05-10 731-831 0XXX3XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H SIDONIA TN
2023-05-10 831-279 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SALINAS CA
2023-05-09 213-662 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H LSAN DA 09 CA
2023-05-09 236-774 not yet reported which blocks → Iristel Inc. 154E Whistler —
2023-05-09 316-205 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J WICHITA KS
2023-05-09 346-653 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 DICKINSON TX
2023-05-09 408-312 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SAN MARTIN CA
2023-05-09 479-552 0–9 XXXwhole prefix which blocks → ONVOY, LLC - AR 348F BENTONVL AR

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.