NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

2 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 872
NEW CINGULAR WIRELESS PCS, LLC - IL 1
8X8, INC. 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
2023-09-21 872-339 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
2023-08-25 872-338 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2023-08-08 872-300 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2023-07-26 872-200 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2023-07-20 872-331 0–9 XXXall 10 · 4 holders which blocks → CALLWORKS CORPORATION 475J CHICGOZN02 IL
2023-07-13 872-224 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C CHICGOZN06 IL
2023-07-13 872-309 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN07 IL
2023-06-21 872-344 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN03 IL
2023-06-15 872-217 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C CHICGOZN08 IL
2023-06-08 872-352 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN09 IL
2023-05-01 872-335 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
2023-03-17 872-332 0–9 XXXall 10 · 4 holders which blocks → FIVE9, INC. 598J CHICGOZN02 IL
2023-03-14 872-329 0–9 XXXall 10 · 2 holders which blocks → AT&T - LOCAL 7421 CHICGOZN10 IL
2023-03-14 872-330 0–9 XXXall 10 · 2 holders which blocks → LEAP TELECOM, LLC 616J CHICGOZN02 IL
2023-03-10 872-328 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN06 IL
2023-01-13 872-372 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C CHICGOZN05 IL
2022-11-23 872-326 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C CHICGOZN07 IL
2022-11-23 872-327 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C CHICGOZN04 IL
2022-11-21 872-325 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2022-11-09 872-324 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H CHICGOZN09 IL
2022-11-09 872-358 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C CHICGOZN06 IL
2022-10-14 872-321 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H CHICGOZN05 IL
2022-10-14 872-322 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H CHICGOZN06 IL
2022-10-03 872-320 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN10 IL
2022-09-15 872-319 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2022-08-05 872-316 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2022-07-22 872-314 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN02 IL
2022-07-07 872-306 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H CHICGOZN09 IL
2022-06-01 872-323 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2022-04-13 872-867 0–9 XXXall 10 · 4 holders which blocks → COMMIO, LLC 939H CHICGOZN03 IL
2022-03-14 872-299 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J CHICGOZN01 IL
2022-03-09 872-342 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H CHICGOZN01 IL
2022-03-09 872-367 0XXX1XXX3XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H CHICGOZN04 IL
2022-03-09 872-842 0XXX1XXX2XXX5XXX6XXX · 3 holders which blocks → FRACTEL, LLC 965H CHICGOZN11 IL
2022-02-18 872-568 0XXX3XXX4XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN07 IL
2022-02-17 872-317 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN07 IL
2022-02-11 872-318 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2022-02-01 872-463 0–9 XXXall 10 · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN10 IL
2022-01-27 872-334 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN06 IL
2022-01-27 872-337 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN05 IL
2022-01-27 872-343 0XXX1XXX2XXX7XXX8XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN07 IL
2022-01-27 872-346 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN04 IL
2022-01-27 872-355 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN01 IL
2022-01-27 872-453 0–9 XXXall 10 · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN09 IL
2022-01-27 872-627 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN02 IL
2022-01-27 872-674 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN08 IL
2021-12-21 872-822 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 CHICGOZN07 IL
2021-12-21 872-844 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 CHICGOZN09 IL
2021-12-21 872-855 5XXX8XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 CHICGOZN04 IL
2021-11-24 872-313 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN08 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.