NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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
2021-11-04 872-297 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2021-10-28 872-295 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN03 IL
2021-10-28 872-296 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN03 IL
2021-10-28 872-336 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H CHICGOZN01 IL
2021-10-28 872-946 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CHICGOZN03 IL
2021-10-15 872-871 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 CHICGOZN01 IL
2021-10-11 872-293 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2021-10-11 872-294 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2021-09-29 872-291 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2021-09-29 872-292 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2021-09-27 872-290 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN10 IL
2021-09-20 872-289 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2021-09-10 872-288 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J CHICGOZN01 IL
2021-08-18 872-899 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CHICGOZN01 IL
2021-08-03 872-287 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2021-07-28 872-286 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN09 IL
2021-07-14 872-285 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C CHICGOZN08 IL
2021-05-27 872-835 0–9 XXXwhole prefix which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN01 IL
2021-05-19 872-284 0–9 XXXall 10 · 3 holders which blocks → HD CARRIER LLC 321J CHICGOZN05 IL
2021-04-08 872-664 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN01 IL
2021-03-30 872-283 0–9 XXXall 10 · 7 holders which blocks → ONVOY SPECTRUM, LLC 624H CHICGOZN07 IL
2021-03-17 872-910 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C CHICGOZN01 IL
2021-02-23 872-678 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHICGOZN11 IL
2021-02-04 872-877 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H CHICGOZN04 IL
2021-01-19 872-732 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H CHICGOZN08 IL
2021-01-18 872-279 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → UCOMTEL INC. 534J CHICGOZN01 IL
2021-01-08 872-270 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN01 IL
2021-01-04 872-345 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H CHICGOZN01 IL
2020-10-26 872-277 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN05 IL
2020-10-02 872-274 0–9 XXXall 10 · 6 holders which blocks → IP HORIZON LLC 515J CHICGOZN04 IL
2020-09-17 872-273 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D CHICGOZN03 IL
2020-09-09 872-272 0–9 XXXall 10 · 4 holders which blocks → STRATUS NETWORKS 495J CHICGOZN04 IL
2020-08-28 872-895 0–9 XXXall 10 · 5 holders which blocks → TWILIO INTERNATIONAL, INC. 506J CHICGOZN01 IL
2020-08-26 872-269 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN08 IL
2020-08-11 872-268 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J CHICGOZN01 IL
2020-07-14 872-362 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H CHICGOZN05 IL
2020-07-14 872-758 0–9 XXXall 10 · 8 holders which blocks → FRACTEL, LLC 965H CHICGOZN10 IL
2020-07-14 872-766 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CHICGOZN01 IL
2020-06-08 872-265 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN10 IL
2020-05-28 872-873 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC 224C CHICGOZN11 IL
2020-05-18 872-264 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2020-05-14 872-263 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2020-04-16 872-282 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C CHICGOZN01 IL
2020-03-31 872-278 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C CHICGOZN01 IL
2020-03-19 872-262 0–9 XXXall 10 · 5 holders which blocks → AT&T - LOCAL 7421 CHICGOZN09 IL
2020-03-13 872-261 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN10 IL
2020-01-09 872-259 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2020-01-09 872-260 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2020-01-08 872-258 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-12-12 872-257 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN05 IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.