NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 575
QWEST CORPORATION 77
ONVOY, LLC - NM 54
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 51
T-MOBILE USA, INC. 37
NEW CINGULAR WIRELESS PCS, LLC - IL 37
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
2003-11-25 575-545 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DEMING NM
2003-07-01 575-618 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ANTHONY NM
2003-07-01 575-619 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SNA TERESA NM
2003-06-24 575-707 4XXX5XXX6XXX7XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 RATON NM
2003-06-24 575-708 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 TUCUMCARI NM
2003-06-23 575-815 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 TUCUMCARI NM
2003-06-03 575-418 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 SOCORRO NM
2003-02-26 575-441 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOBBS NM
2002-11-18 575-706 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CARLSBAD NM
2002-10-18 575-808 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RUIDOSO NM
2002-10-14 575-595 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ANGEL FIRE NM
2002-06-19 575-680 0–9 XXXall 10 · 5 holders which blocks → AT&T - LOCAL 7421 LAS CRUCES NM
2002-05-16 575-578 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NM 5470 ROSWELL NM
2002-05-02 575-613 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NM 5470 TAOS NM
2002-05-01 575-635 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NM 5470 LAS CRUCES NM
2002-03-20 575-494 7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 DEMING NM
2002-02-19 575-616 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F ARTESIA NM
2001-12-18 575-218 2XXX3XXX4XXX7XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 CLOVIS NM
2001-12-18 575-513 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARTESIA NM
2001-12-18 575-914 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ROSWELL NM
2001-10-12 575-704 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 LOVINGTON NM
2001-10-12 575-937 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → METROPCS, INC. 5562 RUIDOSO NM
2001-07-17 575-312 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM
2001-07-17 575-317 0XXX2XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 ROSWELL NM
2001-07-17 575-318 0XXX2XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 HOBBS NM
2001-05-14 575-313 8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 SILVERCITY NM
2001-03-16 575-302 0XXX2XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CARLSBAD NM
— 575-202 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 LAS CRUCES NM
— 575-208 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NM 5470 ROSWELL NM
— 575-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT NM
— 575-222 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J LAS CRUCES NM
— 575-225 not yet reported which blocks → LEACO RURAL TEL. COOP., INC. 2264 ANTLPE RDG NM
— 575-226 not yet reported which blocks → YUCCA TELECOMM SYSTEMS, INC., DBA YUCCA COMM-NM 2350 PORTALES NM
— 575-231 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ARTESIA NM
— 575-233 6XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 LA MESA NM
— 575-234 not yet reported which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 CARLSBAD NM
— 575-235 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - NM 206F CHAMA NM
— 575-236 4XXX which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 CARLSBAD NM
— 575-253 not yet reported which blocks → ROOSEVELT COUNTY RURAL TEL. COOP., INC. 2272 MELROSE NM
— 575-257 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 RUIDOSO NM
— 575-258 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 RUIDOSO NM
— 575-262 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - NM 206F ANTHONY NM
— 575-267 2XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9636 HATCH NM
— 575-273 not yet reported which blocks → ROOSEVELT COUNTY RURAL TEL. COOP., INC. 2272 CAUSEY NM
— 575-274 not yet reported which blocks → ROOSEVELT COUNTY RURAL TEL. COOP., INC. 2272 ELIDA NM
— 575-276 not yet reported which blocks → ROOSEVELT COUNTY RURAL TEL. COOP., INC. 2272 ARCH NM
— 575-278 not yet reported which blocks → BACA VALLEY TEL. CO., INC. 2259 DES MOINES NM
— 575-279 not yet reported which blocks → E.N.M.R. TEL COOP 2262 HOUSE NM
— 575-289 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 CUBA NM
— 575-297 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F TRUTHCQNCS NM

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.