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
2019-11-29 872-255 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D CHICGOZN04 IL
2019-11-04 872-250 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C CHICGOZN01 IL
2019-09-17 872-710 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H CHICGOZN01 IL
2019-09-12 872-249 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2019-05-23 872-248 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN08 IL
2019-02-13 872-246 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN06 IL
2019-01-24 872-245 0–9 XXXall 10 · 3 holders which blocks → VOIP INNOVATIONS, LLC 597F CHICGOZN04 IL
2017-11-01 872-838 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN05 IL
2017-10-11 872-348 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN08 IL
2017-08-22 872-266 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN08 IL
2017-06-06 872-870 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C CHICGOZN09 IL
2017-05-02 872-365 0–9 XXXall 10 · 6 holders which blocks → COMMIO, LLC 939H CHICGOZN02 IL
2016-09-08 872-804 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN02 IL
2016-07-27 872-762 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN06 IL
2016-07-26 872-760 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN10 IL
2016-07-22 872-763 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN06 IL
2016-07-21 872-769 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN06 IL
2016-07-13 872-757 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2016-07-12 872-310 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2016-04-07 872-843 0–9 XXXwhole prefix which blocks → ILLINOIS BELL TEL CO 9329 CHICGOZN04 IL
2015-12-28 872-772 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN04 IL
2015-12-23 872-231 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC 224C CHICGOZN05 IL
2015-12-23 872-304 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C CHICGOZN03 IL
2015-11-23 872-204 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C CHICGOZN08 IL
2015-11-23 872-219 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C CHICGOZN07 IL
2015-10-23 872-724 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2015-07-21 872-315 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2015-07-21 872-904 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2015-06-12 872-810 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN02 IL
2015-05-22 872-308 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2015-03-30 872-903 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 TELECOM OF ILLINOIS, LLC - IL 138G CHICGOZN09 IL
2015-03-13 872-302 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C CHICGOZN02 IL
2015-02-13 872-985 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 TELECOM OF ILLINOIS, LLC - IL 138G CHICGOZN02 IL
2014-10-22 872-818 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C CHICGOZN07 IL
2014-10-21 872-901 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 CHICGOZN07 IL
2014-10-13 872-731 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2014-10-07 872-267 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C CHICGOZN08 IL
2014-10-06 872-281 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C CHICGOZN06 IL
2014-10-03 872-814 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN04 IL
2014-09-30 872-276 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN06 IL
2014-09-30 872-817 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN04 IL
2014-09-17 872-813 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN05 IL
2014-08-15 872-241 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN02 IL
2014-07-01 872-242 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 CHICGOZN04 IL
2014-05-15 872-254 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2014-05-15 872-307 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2014-05-05 872-256 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN05 IL
2014-04-25 872-713 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN04 IL
2014-03-17 872-229 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2014-03-17 872-251 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 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.