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
— 575-799 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLOVIS NM
— 575-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT NM
— 575-817 not yet reported which blocks → LEACO RURAL TELEPHONE COOPERATIVE, INC. DBA LEACO 3798 CARLSBAD NM
— 575-824 7XXX which blocks → QWEST CORPORATION 9636 CHAPARRAL NM
— 575-826 not yet reported which blocks → DELL TEL. CORP. INC. - NM 4433 GUAD PEAK NM
— 575-829 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 JEMEZ SPG NM
— 575-834 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 SAN YSIDRO NM
— 575-835 not yet reported which blocks → QWEST CORPORATION 9636 SOCORRO NM
— 575-838 not yet reported which blocks → QWEST CORPORATION 9636 SOCORRO NM
— 575-840 0XXX1XXX2XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ROSWELL NM
— 575-849 not yet reported which blocks → E.N.M.R. TEL COOP 2262 CORONA NM
— 575-854 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 MAGDALENA NM
— 575-868 not yet reported which blocks → E.N.M.R. TEL COOP 2262 CONCHASDAM NM
— 575-874 8XXX which blocks → QWEST CORPORATION 9636 SNA TERESA NM
— 575-882 not yet reported which blocks → QWEST CORPORATION 9636 ANTHONY NM
— 575-885 not yet reported which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 CARLSBAD NM
— 575-887 not yet reported which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 CARLSBAD NM
— 575-894 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 TRUTHCQNCS NM
— 575-895 none assigned yet which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 HILLSBORO NM
— 575-909 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ARTESIA NM
— 575-910 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ROSWELL NM
— 575-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT NM
— 575-921 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9636 ALAMOGORDO NM
— 575-942 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F HOBBS NM
— 575-950 not yet reported which blocks → NM
— 575-956 3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 SILVERCITY NM
— 575-958 not yet reported which blocks → NM
— 575-959 not yet reported which blocks → NM
— 575-963 not yet reported which blocks → DELL TEL. CORP. INC. - NM 4433 DELL CITY NM
— 575-976 not yet reported which blocks → NM
— 575-981 not yet reported which blocks → DELL TEL. CORP. INC. - NM 4433 QUEEN NM
— 575-985 not yet reported which blocks → E.N.M.R. TEL COOP 2262 RANCHVALE NM
— 575-987 not yet reported which blocks → DELL TEL. CORP. INC. - NM 4433 TIMBERON NM
— 575-993 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM
— 575-997 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 SNA TERESA 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.