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
2019-10-10 224-348 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H ALGONQUIN IL
2019-10-10 224-933 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H ROUND LAKE IL
2019-10-10 224-977 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H NORTHBROOK IL
2019-08-07 224-314 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARLIGTNHTS IL
2019-04-15 224-299 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 ELK GROVE IL
2019-03-18 224-285 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DEERFIELD IL
2019-03-06 224-666 0–9 XXXall 10 · 3 holders which blocks → TERRA NOVA TELECOM INC. 145J ARLIGTNHTS IL
2018-12-05 224-296 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC 224C EVANSTON IL
2018-12-05 224-298 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C GRAYSLAKE IL
2018-10-23 224-297 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2018-10-22 224-295 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 PALATINE IL
2018-10-19 224-294 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LIBERTYVL IL
2018-07-23 224-292 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUNDELEIN IL
2018-04-16 224-291 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ELGIN IL
2018-04-06 224-289 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 DESPLAINES IL
2018-02-27 224-288 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BARRINGTON IL
2018-01-31 224-283 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2018-01-31 224-284 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DEERFIELD IL
2017-12-11 224-275 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2017-12-08 224-274 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 HALF DAY IL
2017-11-14 224-273 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 ARLIGTNHTS IL
2017-10-23 224-266 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 ELK GROVE IL
2017-07-21 224-264 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DESPLAINES IL
2017-03-20 224-322 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2017-03-20 224-529 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 GLENVIEW IL
2017-01-20 224-477 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 DESPLAINES IL
2016-12-13 224-570 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H WAUKEGAN IL
2016-12-12 224-605 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ELGIN IL
2016-12-12 224-607 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-11-29 224-426 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FOX LAKE IL
2016-11-21 224-287 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NORTHBROOK IL
2016-11-11 224-421 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-11-11 224-428 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALGONQUIN IL
2016-11-10 224-602 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUNDELEIN IL
2016-10-31 224-414 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BENSENVL IL
2016-10-17 224-575 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ELGIN IL
2016-10-17 224-580 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2016-09-30 224-278 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ROSELLE IL
2016-09-27 224-271 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 LAKEFOREST IL
2016-08-26 224-551 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DEERFIELD IL
2016-07-21 224-763 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NORTHBROOK IL
2016-07-21 224-769 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ELGIN IL
2016-07-18 224-762 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 ELGIN IL
2016-06-21 224-754 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 HIGHLANDPK IL
2016-05-02 224-539 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 PALATINE IL
2016-04-20 224-724 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 SKOKIE IL
2016-03-30 224-781 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J FRANKLINPK IL
2016-03-24 224-747 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC 224C HAMPSHIRE IL
2016-03-24 224-904 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NORTHBROOK IL
2016-03-08 224-263 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C HUNTLEY 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.