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
2014-03-17 872-252 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2014-03-17 872-706 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2014-03-17 872-707 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2014-01-16 872-704 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN08 IL
2013-12-04 872-529 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN02 IL
2013-10-07 872-701 0XXX1XXX2XXX3XXX6XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2013-10-07 872-703 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2013-09-30 872-802 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2013-09-30 872-806 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2013-09-30 872-808 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2013-06-28 872-236 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2013-06-28 872-238 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2013-06-27 872-234 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2013-06-26 872-227 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2013-06-26 872-235 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2013-06-26 872-243 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2013-06-03 872-239 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2013-05-24 872-218 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2013-05-24 872-303 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2013-05-24 872-305 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2013-05-01 872-801 0XXX1XXX2XXX3XXX4XXX9XXX which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2013-05-01 872-803 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2013-04-18 872-210 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2013-04-18 872-214 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2013-04-18 872-301 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2013-04-11 872-356 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C CHICGOZN10 IL
2013-04-11 872-639 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN07 IL
2013-02-19 872-215 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2013-02-15 872-702 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2013-02-11 872-240 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2012-12-21 872-999 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C CHICGOZN02 IL
2012-11-20 872-253 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C CHICGOZN08 IL
2012-11-19 872-465 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CHICGOZN07 IL
2012-11-19 872-829 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C CHICGOZN04 IL
2012-09-28 872-209 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2012-09-21 872-207 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN08 IL
2012-06-25 872-208 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J CHICGOZN02 IL
2012-03-27 872-206 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J CHICGOZN04 IL
2012-02-23 872-205 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN06 IL
2012-02-10 872-203 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN02 IL
2012-01-11 872-202 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2011-09-07 872-225 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C CHICGOZN01 IL
2011-07-27 872-237 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2011-07-19 872-226 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2011-07-08 872-212 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2011-07-01 872-244 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C CHICGOZN07 IL
2011-07-01 872-395 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN10 IL
2011-06-30 872-484 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2011-06-20 872-233 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2011-06-15 872-232 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 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.