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
2014-02-04 575-329 0–9 XXXall 10 · 7 holders which blocks → CEBRIDGE TELECOM NM, LLC DBA SUDDENLINK COMM NM 243H CANNON AFB NM
2013-11-01 575-366 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → CEBRIDGE TELECOM NM, LLC DBA SUDDENLINK COMM NM 243H CLOVIS NM
2013-08-10 575-361 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 CARLSBAD NM
2013-08-10 575-626 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ROSWELL NM
2013-08-10 575-703 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ARTESIA NM
2013-04-05 575-404 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALAMOGORDO NM
2013-03-26 575-265 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NM 5470 CLOVIS NM
2013-03-26 575-449 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NM 5470 LAS CRUCES NM
2013-02-08 575-468 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM 7464 PORTALES NM
2012-03-05 575-424 2XXX4XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NM 5470 VIRDEN NM
2012-02-16 575-252 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NM 206F ANGEL FIRE NM
2012-02-13 575-325 not yet reported which blocks → PLATEAU TELECOMMUNICATIONS, INC. - NM 777B CANNON AFB NM
2012-02-03 575-245 not yet reported which blocks → SIERRA COMMUNICATIONS, INC. - NM 713G RATON NM
2012-01-30 575-264 not yet reported which blocks → PVT NETWORKS, INC. - NM 438D HOBBS NM
2012-01-18 575-567 0–9 XXXall 10 · 6 holders which blocks → INTERACTIVE NETWORKS CORPORATION -NM 167F DEMING NM
2012-01-12 575-352 not yet reported which blocks → PLATEAU TELECOMMUNICATIONS, INC. - NM 777B SPRINGER NM
2011-10-06 575-342 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NM 206F SILVERCITY NM
2011-08-05 575-291 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F ROSWELL NM
2011-06-09 575-315 0–9 XXXall 10 · 6 holders which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 RUIDOSO NM
2011-05-23 575-689 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CARLSBAD NM
2011-05-18 575-455 1XXX5XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MORA NM
2011-05-10 575-282 not yet reported which blocks → PLATEAU TELECOMMUNICATIONS, INC. - NM 777B TUCUMCARI NM
2011-04-05 575-686 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAPITAN NM
2011-04-04 575-414 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LOVING NM
2011-03-29 575-488 not yet reported which blocks → TULAROSA COMMUNICATIONS, INC. - NM 470G ALAMOGORDO NM
2010-11-24 575-332 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K SNA TERESA NM
2010-10-14 575-263 0–9 XXXall 10 · 4 holders which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 HOBBS NM
2010-10-06 575-343 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 HATCH NM
2010-03-16 575-777 9XXX which blocks → T-MOBILE USA, INC. 6529 CLOVIS NM
2010-02-03 575-224 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 TAOS NM
2010-02-03 575-383 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - NM 206F RATON NM
2010-01-20 575-323 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → VALUTEL COMMUNICATIONS, INC. - NM 9658 LAS CRUCES NM
2010-01-06 575-268 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 CLOVIS NM
2009-10-28 575-652 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAS CRUCES NM
2009-07-14 575-203 none assigned yet which blocks → ONVOY, LLC - NM 206F SNA TERESA NM
2009-07-14 575-204 0XXX which blocks → ONVOY, LLC - NM 206F CLOVIS NM
2009-07-14 575-212 none assigned yet which blocks → ONVOY, LLC - NM 206F TUCUMCARI NM
2009-07-14 575-217 none assigned yet which blocks → ONVOY, LLC - NM 206F RATON NM
2009-07-14 575-227 4XXX which blocks → ONVOY, LLC - NM 206F ALAMOGORDO NM
2009-07-14 575-230 0XXX8XXX · 2 holders which blocks → ONVOY, LLC - NM 206F ROSWELL NM
2009-07-14 575-238 none assigned yet which blocks → ONVOY, LLC - NM 206F TAOS NM
2009-07-14 575-239 6XXX which blocks → ONVOY, LLC - NM 206F SILVERCITY NM
2009-07-14 575-272 none assigned yet which blocks → ONVOY, LLC - NM 206F SOCORRO NM
2009-07-14 575-275 not yet reported which blocks → QWEST CORPORATION 9636 DEMING NM
2009-07-14 575-330 none assigned yet which blocks → ONVOY, LLC - NM 206F ARTESIA NM
2009-07-14 575-353 8XXX9XXX · 2 holders which blocks → ONVOY, LLC - NM 206F LAS CRUCES NM
2008-12-03 575-952 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 TRUTHCQNCS NM
2008-10-20 575-300 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NM 5470 LA MESA NM
2008-09-17 575-941 not yet reported which blocks → PVT NETWORKS, INC. - NM 438D CARLSBAD NM
2008-07-29 575-520 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAS CRUCES 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.