NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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, all time — NPA 575
BANDWIDTH.COM CLEC, LLC - NM 23
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
2022-08-25 575-286 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F ALAMOGORDO NM
2022-01-26 575-287 0XXX1XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F JAL NM
2021-11-22 575-283 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F ANTHONY NM
2021-11-17 575-280 0XXX1XXX2XXX3XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F QUESTA NM
2020-12-23 575-249 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F LAS CRUCES NM
2018-03-14 575-733 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F RATON NM
2017-07-21 575-530 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F CLOVIS NM
2015-09-01 575-719 none assigned yet which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F TULAROSA NM
2015-09-01 575-729 5XXX6XXX7XXX8XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F ALTO NM
2015-09-01 575-940 4XXX5XXX6XXX8XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F CAPITAN NM
2015-08-31 575-221 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F EUNICE NM
2015-08-31 575-651 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F RUIDOSODWN NM
2015-05-06 575-655 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F PENASCO NM
2015-04-17 575-459 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F SPRINGER NM
2014-11-13 575-629 0XXX1XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F TULAROSA NM
2014-10-13 575-228 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F ALTO NM
2014-06-03 575-425 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F TAOS NM
2011-08-05 575-291 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F ROSWELL NM
2002-02-19 575-616 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F ARTESIA NM
— 575-297 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F TRUTHCQNCS NM
— 575-303 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F RATON NM
— 575-502 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F SNA TERESA NM
— 575-942 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F HOBBS NM

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.