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
2018-05-08 575-573 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H CRLSBACRNS NM
2018-05-08 575-577 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → ONVOY, LLC - NM 206F EL RITO NM
2018-05-08 575-579 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - NM 206F HILLSBORO NM
2018-05-08 575-600 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - NM 206F LYBROOK NM
2018-05-08 575-900 0XXX1XXX2XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - NM 206F VALLECITOS NM
2018-04-11 575-988 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 CARLSBAD NM
2018-03-14 575-733 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F RATON NM
2017-10-03 575-500 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NM 206F ROSWELL NM
2017-08-31 575-800 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NM 206F LAS CRUCES NM
2017-08-17 575-250 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NM 206F GALLINA NM
2017-08-17 575-251 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NM 206F JAL NM
2017-08-17 575-254 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - NM 206F JEMEZ SPG NM
2017-08-17 575-255 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NM 206F SAN YSIDRO NM
2017-08-17 575-256 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → ONVOY, LLC - NM 206F TIERRAAMRL NM
2017-08-01 575-552 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NM 206F HOBBS NM
2017-07-21 575-530 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F CLOVIS NM
2017-06-06 575-454 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → TULAROSA COMMUNICATIONS, INC. - NM 470G RUIDOSO NM
2017-04-03 575-242 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H SILVERCITY NM
2017-04-03 575-592 0–9 XXXall 10 · 7 holders which blocks → TELNYX LLC 073H DEMING NM
2017-03-09 575-999 0–9 XXXall 10 · 7 holders which blocks → TELNYX LLC 073H TAOS NM
2016-03-22 575-727 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - NM 206F BAYARD NM
2016-03-22 575-735 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - NM 206F CIMARRON NM
2016-03-01 575-232 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF NEW MEXICO, LLC - NM 377H CHAPARRAL NM
2016-02-22 575-205 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM 7464 TUCUMCARI NM
2016-01-28 575-659 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM 7464 LOVINGTON NM
2016-01-07 575-215 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF NEW MEXICO, LLC - NM 377H ANTHONY NM
2015-10-15 575-339 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF NEW MEXICO, LLC - NM 377H LAS CRUCES NM
2015-09-04 575-363 0–9 XXXall 10 · 8 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ROSWELL 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
2015-06-26 575-223 0–9 XXXall 10 · 7 holders which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 TRUTHCQNCS NM
2015-06-26 575-888 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - NM 206F LAS CRUCES NM
2015-06-15 575-429 0XXX2XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLAYTON NM
2015-06-05 575-440 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J RED RIVER NM
2015-06-05 575-717 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J QUESTA NM
2015-06-01 575-728 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J HATCH NM
2015-05-15 575-385 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 CUBA 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
2015-03-13 575-214 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ALAMOGORDO NM
2014-12-31 575-419 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 DULCE 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
2014-10-03 575-489 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 ALAMOGORDO NM
2014-09-15 575-288 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NM 5470 LAS CRUCES NM
2014-06-03 575-425 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F TAOS NM
2014-02-21 575-220 none assigned yet which blocks → CEBRIDGE TELECOM NM, LLC DBA SUDDENLINK COMM NM 243H TEXICO 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.