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
2022-08-09 224-481 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WHEELING IL
2022-08-05 224-474 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2022-07-28 224-471 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2022-06-22 224-467 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NORTHBROOK IL
2022-06-10 224-464 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WHEELING IL
2022-06-09 224-463 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 GLENVIEW IL
2022-05-27 224-462 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALGONQUIN IL
2022-05-11 224-446 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2022-05-11 224-461 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DEERFIELD IL
2022-04-01 224-460 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2022-03-22 224-459 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LIBERTYVL IL
2022-02-25 224-457 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ELGIN IL
2022-02-25 224-642 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ELGIN IL
2022-02-23 224-837 0XXX4XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J GLENCOE IL
2022-02-22 224-454 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELGIN IL
2022-01-31 224-453 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DEERFIELD IL
2022-01-13 224-536 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SKOKIE IL
2022-01-13 224-546 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J PALATINE IL
2022-01-13 224-742 0XXX1XXX2XXX6XXX8XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J HALF DAY IL
2022-01-07 224-450 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALGONQUIN IL
2022-01-06 224-768 2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J LAKEFOREST IL
2021-12-23 224-448 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BARRINGTON IL
2021-11-17 224-439 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 WAUKEGAN IL
2021-10-27 224-455 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H WAUKEGAN IL
2021-10-27 224-466 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H NORTHBROOK IL
2021-10-27 224-833 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ELGIN IL
2021-10-27 224-844 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ARLIGTNHTS IL
2021-10-25 224-438 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 LAKEZURICH IL
2021-10-25 224-866 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H DESPLAINES IL
2021-10-19 224-437 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WHEELING IL
2021-10-11 224-431 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2021-10-07 224-447 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 WAUKEGAN IL
2021-10-07 224-809 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 DESPLAINES IL
2021-09-23 224-429 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H GRAYSLAKE IL
2021-09-22 224-418 7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 ELK GROVE IL
2021-09-22 224-449 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 ELGIN IL
2021-09-10 224-417 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EVANSTON IL
2021-08-31 224-416 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E WAUKEGAN IL
2021-08-12 224-403 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C WILMETTE IL
2021-08-10 224-398 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J ARLIGTNHTS IL
2021-08-03 224-391 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2021-08-03 224-396 0XXX3XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BARRINGTON IL
2021-08-03 224-397 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALGONQUIN IL
2021-07-14 224-394 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C BARTLETT IL
2021-07-14 224-395 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C BENSENVL IL
2021-07-07 224-390 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ROUND LAKE IL
2021-06-09 224-393 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C HUNTLEY IL
2021-06-07 224-389 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALGONQUIN IL
2021-06-01 224-445 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C ANTIOCH IL
2021-05-14 224-384 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS 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.