NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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, all time — NPA 574
NEW CINGULAR WIRELESS PCS, LLC - IL 49
FRONTIER NORTH, INC.. - IN 45
INDIANA BELL TEL CO INC 43
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 38
BRIGHTSPEED OF INDIANA, LLC 35
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
2026-07-10 574-587 0XXX8XXX which blocks → OPENTACT INC. 824J SOUTH BEND IN
2026-05-19 574-774 4XXX7XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J GOSHEN IN
2025-12-04 574-415 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → WAVENATION, LLC 700J SOUTH BEND IN
2025-09-22 574-412 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - IN 097D SOUTH BEND IN
2025-09-22 574-414 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
2025-08-18 574-403 0XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 ELKHART IN
2025-04-03 574-410 0XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 LEESBURG IN
2025-03-13 574-409 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IN 097D SOUTH BEND IN
2025-01-23 574-408 0XXX1XXX · 2 holders which blocks → PEERLESS NETWORK OF INDIANA, LLC - IN 279F PLYMOUTH IN
2024-07-11 574-407 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GOSHEN IN
2024-06-24 574-405 0XXX1XXX8XXX9XXX which blocks → ONVOY, LLC - IN 097D NAPPANEE IN
2024-03-13 574-394 0XXX1XXX2XXX3XXX4XXX8XXX · 2 holders which blocks → ONVOY, LLC - IN 097D WARSAW IN
2023-10-16 574-399 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELKHART IN
2023-09-12 574-317 0XXX1XXX2XXX3XXX4XXX which blocks → COMMIO, LLC 939H BRISTOL IN
2023-03-08 574-397 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J SOUTH BEND IN
2023-02-24 574-396 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → AT&T - LOCAL 7421 OSCEOLA IN
2023-02-01 574-395 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 732J SOUTH BEND IN
2023-01-10 574-392 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 GOSHEN IN
2022-10-11 574-391 1XXX2XXX which blocks → NUSO, LLC 732J KEWANNA IN
2022-09-26 574-574 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - IN 097D GOSHEN IN
2022-09-21 574-390 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 ELKHART IN
2022-03-14 574-381 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J SOUTH BEND IN
2022-02-23 574-768 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ELKHART IN
2022-01-13 574-663 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MIDDLEBURY IN
2022-01-13 574-746 2XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J DUNLAP IN
2022-01-13 574-764 7XXX which blocks → TON80 COMMUNICATIONS, LLC 516J BURKET IN
2022-01-13 574-783 3XXX6XXX7XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J LUCERNE IN
2021-12-07 574-895 0–9 XXXall 10 · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SOUTH BEND IN
2021-11-22 574-901 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H LOGANSPORT IN
2021-11-04 574-384 0XXX1XXX4XXX5XXX9XXX which blocks → ONVOY, LLC - IN 097D KNOX IN
2021-09-23 574-379 0XXX1XXX2XXX which blocks → COMMIO, LLC 939H AKRON IN
2021-09-22 574-388 0XXX2XXX5XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLC - IN 097D LAPAZ IN
2021-09-14 574-378 0–9 XXXall 10 · 5 holders which blocks → IP HORIZON LLC 515J SOUTH BEND IN
2021-06-24 574-375 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → ONVOY, LLC - IN 097D TIPPECANOE IN
2021-06-18 574-577 5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - IN 097D ROYAL CTR IN
2021-05-26 574-570 0XXX5XXX which blocks → ONVOY, LLC - IN 097D PLYMOUTH IN
2021-05-20 574-667 0XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H OSCEOLA IN
2021-05-20 574-786 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ELKHART IN
2021-05-10 574-374 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H GOSHEN IN
2021-01-14 574-369 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 ELKHART IN
2021-01-06 574-368 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELKHART IN
2020-11-25 574-366 0–9 XXXall 10 · 3 holders which blocks → STRATUS NETWORKS 495J SOUTH BEND IN
2020-11-04 574-359 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELKHART IN
2020-10-08 574-758 2XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H WALTON IN
2020-10-08 574-944 3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H TWELVEMILE IN
2020-10-07 574-365 0XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - IN 097D FULTON IN
2020-09-24 574-357 1XXX3XXX7XXX which blocks → NUSO, LLC 478J CULVER IN
2020-09-11 574-977 0XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H WYATT IN
2020-08-13 574-501 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IN 097D GOSHEN IN
2020-06-26 574-352 0–9 XXXall 10 · 3 holders which blocks → CSC WIRELESS, LLC 425J ELKHART IN

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.