NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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, all time — NPA 915
T-MOBILE USA, INC. 51
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
2022-10-11 915-312 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2022-07-21 915-332 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2022-04-28 915-299 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2022-02-09 915-296 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2021-08-20 915-279 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2021-03-09 915-273 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2021-01-11 915-272 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2016-12-29 915-263 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2016-04-29 915-259 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2016-01-13 915-352 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2015-08-27 915-316 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2015-04-09 915-706 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2014-09-23 915-262 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2014-07-22 915-229 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2014-03-28 915-704 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2014-03-04 915-213 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2013-11-11 915-701 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2012-12-24 915-216 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2011-07-20 915-244 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2011-07-20 915-245 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2002-01-16 915-443 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2001-09-10 915-861 0XXX2XXX3XXX8XXX which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2001-08-07 915-269 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2001-02-08 915-892 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-203 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-204 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-240 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-241 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-252 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-253 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-256 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-274 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-276 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-328 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-329 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-346 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-355 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-373 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-383 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-422 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-433 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-630 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-726 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-727 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-731 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-740 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-799 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-820 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-867 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-873 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.