NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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 — NPA 224
NEW CINGULAR WIRELESS PCS, LLC - IL 1
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
2021-05-04 224-452 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C PALATINE IL
2021-05-04 224-472 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C WINNETKA IL
2021-03-31 224-382 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 GLENVIEW IL
2021-03-30 224-378 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC 224C LIBERTYVL IL
2021-03-30 224-379 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C PARK RIDGE IL
2021-03-30 224-840 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C ELGIN IL
2021-03-30 224-850 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H CARY IL
2021-03-25 224-376 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FOX LAKE IL
2021-03-09 224-375 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALGONQUIN IL
2021-02-11 224-373 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DEERFIELD IL
2021-02-04 224-371 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C GRAYSLAKE IL
2021-01-25 224-370 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2021-01-14 224-369 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 WAUKEGAN IL
2021-01-13 224-349 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2021-01-04 224-822 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ARLIGTNHTS IL
2020-12-18 224-341 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SKOKIE IL
2020-12-11 224-368 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2020-11-27 224-799 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H NORTHBROOK IL
2020-09-30 224-363 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ELGIN IL
2020-09-23 224-526 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ARLIGTNHTS IL
2020-09-18 224-354 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D DESPLAINES IL
2020-09-18 224-566 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ALGONQUIN IL
2020-09-04 224-350 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → STRATUS NETWORKS 495J EVANSTON IL
2020-08-27 224-335 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → STRATUS NETWORKS 495J ANTIOCH IL
2020-08-06 224-786 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H HIGHLANDPK IL
2020-08-06 224-966 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H PISTAKHLDS IL
2020-07-14 224-346 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H LAKE VILLA IL
2020-07-14 224-689 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H ELGIN IL
2020-07-14 224-744 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H FRANKLINPK IL
2020-07-14 224-899 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H WHEELING IL
2020-07-14 224-922 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H GLENCOE IL
2020-07-14 224-955 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ROSELLE IL
2020-07-13 224-722 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ELK GROVE IL
2020-07-10 224-499 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H ARLIGTNHTS IL
2020-07-10 224-599 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H BARRINGTON IL
2020-06-22 224-451 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C BARRINGTON IL
2020-06-08 224-329 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSELLE IL
2020-06-08 224-946 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H WAUKEGAN IL
2020-05-28 224-328 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C WINNETKA IL
2020-05-28 224-344 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C WILMETTE IL
2020-05-06 224-332 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 LAKEFOREST IL
2020-04-27 224-327 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 MUNDELEIN IL
2019-10-23 224-319 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E DESPLAINES IL
2019-10-17 224-758 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H ELK GROVE IL
2019-10-14 224-362 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H ZION IL
2019-10-11 224-342 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H ARLIGTNHTS IL
2019-10-11 224-367 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRACTEL, LLC 965H DUNDEE IL
2019-10-11 224-488 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H GLENVIEW IL
2019-10-11 224-842 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H LIBERTYVL IL
2019-10-10 224-317 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 LAKEFOREST IL

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.