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
2008-06-25 575-386 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAS CRUCES NM
2008-06-24 575-597 not yet reported which blocks → INTERACTIVE NETWORKS CORPORATION -NM 167F SILVERCITY NM
2008-05-07 575-674 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
2008-04-22 575-408 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOBBS NM
2008-04-17 575-725 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CARLSBAD NM
2008-02-22 575-915 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAS CRUCES NM
2007-10-07 575-229 9XXX which blocks → CEBRIDGE TELECOM NM, LLC DBA SUDDENLINK COMM NM 243H TEXICO NM
2007-06-21 575-415 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ALAMOGORDO NM
2007-06-21 575-654 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 SILVERCITY NM
2007-06-21 575-936 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 DEMING NM
2007-04-12 575-448 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NM 206F CHAPARRAL NM
2007-04-12 575-904 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NM 206F CANNON AFB NM
2007-03-13 575-322 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NM 206F SOCORRO NM
2007-02-13 575-964 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM 7464 HOBBS NM
2006-12-05 575-912 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - NM 206F BAYARD NM
2006-09-20 575-605 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOBBS NM
2006-09-01 575-209 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CHAMA NM
2006-08-24 575-694 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 DEMING NM
2006-05-15 575-601 not yet reported which blocks → PVT NETWORKS, INC. - NM 438D CLOUDCROFT NM
2006-05-01 575-519 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 SILVERCITY NM
2005-12-12 575-413 not yet reported which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D TRUTHCQNCS NM
2005-12-12 575-444 6XXX7XXX8XXX9XXX · 2 holders which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D ROSWELL NM
2005-12-12 575-498 not yet reported which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D ALTO NM
2005-12-12 575-499 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D CARLSBAD NM
2005-12-12 575-509 not yet reported which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D CAPITAN NM
2005-12-12 575-518 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D SOCORRO NM
2005-12-12 575-691 5XXX6XXX7XXX8XXX9XXX which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D HOBBS NM
2005-12-12 575-810 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D ARTESIA NM
2005-12-12 575-812 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D ALAMOGORDO NM
2005-12-12 575-813 not yet reported which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D RUIDOSODWN NM
2005-12-12 575-932 8XXX9XXX which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D LAS CRUCES NM
2005-11-29 575-517 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SOCORRO NM
2005-10-05 575-805 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAS CRUCES NM
2005-08-03 575-405 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAS CRUCES NM
2005-07-12 575-736 not yet reported which blocks → PVT NETWORKS, INC. - NM 438D ARTESIA NM
2005-05-31 575-973 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 RUIDOSO NM
2005-02-01 575-802 3XXX5XXX7XXX · 2 holders which blocks → MESCALERO APACHE TELECOM, INC. - NM 661D RUIDOSO NM
2004-11-19 575-497 9XXX which blocks → T-MOBILE USA, INC. 6529 TRUTHCQNCS NM
2004-11-12 575-602 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 HOBBS NM
2004-11-11 575-201 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NM 5470 ANTHONY NM
2004-10-14 575-219 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 CLOVIS NM
2004-08-24 575-200 1XXX2XXX3XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 CARLSBAD NM
2004-08-11 575-309 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLOVIS NM
2004-08-05 575-403 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TUCUMCARI NM
2004-08-05 575-607 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PORTALES NM
2004-07-19 575-207 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLAYTON NM
2004-07-19 575-512 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SANTA ROSA NM
2004-01-26 575-935 not yet reported which blocks → PLATEAU TELECOMMUNICATIONS, INC. - NM 777B CLOVIS NM
2004-01-22 575-825 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 PORTALES NM
2004-01-09 575-551 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALAMOGORDO 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.