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
2023-06-22 719-803 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 COLORDOSPG CO
2023-06-22 719-804 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 COLORDOSPG CO
2023-06-22 719-805 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 COLORDOSPG CO
2023-06-22 731-230 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 PARIS TN
2023-06-22 753-339 not yet reported which blocks → ISP Telecom Inc. 4727 Ingleside —
2023-06-22 762-229 0XXX2XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J LINCOLNTON GA
2023-06-22 805-831 0XXX1XXX3XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - CA 649C MORRO BAY CA
2023-06-22 810-318 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C LAPEER MI
2023-06-22 810-319 2XXX which blocks → ONVOY, LLCV - MI 543C RANKIN MI
2023-06-22 810-382 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C FLINT MI
2023-06-22 912-734 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BRUNSWICK GA
2023-06-22 951-636 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C CORONA CA
2023-06-22 979-352 2XXX7XXX · 2 holders which blocks → ONVOY, LLC - TX 903C DEANVILLE TX
2023-06-21 262-398 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WI 225C RACINE WI
2023-06-21 283-203 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CINCINNATI OH
2023-06-21 283-444 0XXX1XXX2XXX4XXX8XXX9XXX · 4 holders which blocks → WIDE VOICE, LLC - OH 765H BETHEL OH
2023-06-21 350-210 0XXX1XXX2XXX3XXX7XXX · 5 holders which blocks → ONVOY, LLC - CA 649C TUOLUMNE CA
2023-06-21 365-342 not yet reported which blocks → ISP Telecom Inc. 4727 Cayuga —
2023-06-21 365-518 not yet reported which blocks → ISP Telecom Inc. 4727 Port Robinson —
2023-06-21 365-740 not yet reported which blocks → ISP Telecom Inc. 4727 Stevensville —
2023-06-21 406-481 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2023-06-21 464-218 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LA GRANGE IL
2023-06-21 468-701 not yet reported which blocks → ISP Telecom Inc. 4727 Chapeau —
2023-06-21 468-979 not yet reported which blocks → ISP Telecom Inc. 4727 Fort-Coulonge —
2023-06-21 507-909 0XXX1XXX8XXX · 3 holders which blocks → MCC TELEPHONY OF MINNESOTA, LLC - MN 719F NICOLLET MN
2023-06-21 548-928 not yet reported which blocks → ISP Telecom Inc. 4727 Drayton —
2023-06-21 548-973 not yet reported which blocks → ISP Telecom Inc. 4727 New Dundee —
2023-06-21 582-241 0XXX1XXX2XXX4XXX · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J TIMBLIN PA
2023-06-21 582-243 0XXX1XXX2XXX · 3 holders which blocks → ONVOY, LLC - PA 547E WELLERSBG PA
2023-06-21 651-397 0XXX7XXX9XXX · 3 holders which blocks → AT&T - LOCAL 7421 NORTH BRCH MN
2023-06-21 712-937 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J SIOUX CITY IA
2023-06-21 753-655 not yet reported which blocks → Iristel Inc. 154E Ottawa-Hull —
2023-06-21 754-318 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - FL 937C CORAL SPG FL
2023-06-21 779-312 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 WOODSTOCK IL
2023-06-21 810-317 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAPEER MI
2023-06-21 816-451 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MO 093F KANSASCITY MO
2023-06-21 872-344 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN03 IL
2023-06-21 904-815 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ST JOHNS FL
2023-06-21 945-297 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C FRISCO TX
2023-06-21 951-635 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS NETWORKS, LLC 899D MURRIETA CA
2023-06-20 313-435 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C DETROITZN6 MI
2023-06-20 346-673 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 HSTNSUBURB TX
2023-06-20 346-675 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 HSTNSUBURB TX
2023-06-20 346-678 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 HSTNSUBURB TX
2023-06-20 365-290 not yet reported which blocks → ISP Telecom Inc. 4727 Beeton —
2023-06-20 419-723 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LIMA OH
2023-06-20 428-526 not yet reported which blocks → Iristel Inc. 154E Harvey Station —
2023-06-20 428-910 not yet reported which blocks → Iristel Inc. 154E Saint John —
2023-06-20 464-217 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FOREST IL
2023-06-20 548-296 not yet reported which blocks → ISP Telecom Inc. 4727 Ohsweken —

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.