NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

375 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/30/2026

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, last 30 days
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 575-528 8XXX9XXX which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-531 not yet reported which blocks → VALLEY TEL COOP INC 2176 COLUMBUS NM
— 575-532 not yet reported which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-533 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 RESERVE NM
— 575-534 not yet reported which blocks → QWEST CORPORATION 9636 SILVERCITY NM
— 575-535 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 CLIFF NM
— 575-536 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 MIMBRES NM
— 575-537 1XXX which blocks → QWEST CORPORATION 9636 BAYARD NM
— 575-538 none assigned yet which blocks → QWEST CORPORATION 9636 SILVERCITY NM
— 575-539 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 GLENWOOD NM
— 575-541 3XXX which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-542 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 LORDSBURG NM
— 575-543 8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 DEMING NM
— 575-544 not yet reported which blocks → QWEST CORPORATION 9636 DEMING NM
— 575-546 not yet reported which blocks → QWEST CORPORATION 9636 DEMING NM
— 575-547 not yet reported which blocks → WESTERN NEW MEXICO TEL. CO., INC. 2268 LUNA NM
— 575-548 not yet reported which blocks → VALLEY TEL COOP INC 2176 ANIMAS NM
— 575-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT NM
— 575-556 4XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 LAS CRUCES NM
— 575-557 not yet reported which blocks → VALLEY TEL COOP INC 2176 RODEO NM
— 575-562 0XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 PORTALES NM
— 575-568 6XXX which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 LYBROOK NM
— 575-571 4XXX which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM
— 575-572 not yet reported which blocks → QWEST CORPORATION 9636 ALAMOGORDO NM
— 575-574 none assigned yet which blocks → QWEST CORPORATION 9636 SILVERCITY NM
— 575-576 not yet reported which blocks → E.N.M.R. TEL COOP 2262 SAN JON NM
— 575-581 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 EL RITO NM
— 575-582 none assigned yet which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 VALLECITOS NM
— 575-584 not yet reported which blocks → E.N.M.R. TEL COOP 2262 VAUGHN NM
— 575-585 not yet reported which blocks → TULAROSA BASIN TELEPHONE CO., INC. 2265 TULAROSA NM
— 575-586 3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 QUESTA NM
— 575-587 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 PENASCO NM
— 575-588 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 TIERRAAMRL NM
— 575-589 8XXX which blocks → QWEST CORPORATION 9636 SNA TERESA NM
— 575-590 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SILVERCITY NM
— 575-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT NM
— 575-621 not yet reported which blocks → T-MOBILE USA, INC. 6529 LAS CRUCES NM
— 575-622 not yet reported which blocks → QWEST CORPORATION 9636 ROSWELL NM
— 575-623 not yet reported which blocks → QWEST CORPORATION 9636 ROSWELL NM
— 575-624 not yet reported which blocks → QWEST CORPORATION 9636 ROSWELL NM
— 575-625 not yet reported which blocks → QWEST CORPORATION 9636 ROSWELL NM
— 575-627 not yet reported which blocks → QWEST CORPORATION 9636 ROSWELL NM
— 575-628 not yet reported which blocks → VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 1164 CARLSBAD NM
— 575-630 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 RUIDOSO NM
— 575-631 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOBBS NM
— 575-633 not yet reported which blocks → E.N.M.R. TEL COOP 2262 NARA VISA NM
— 575-636 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAS CRUCES NM
— 575-637 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX which blocks → QWEST CORPORATION 9636 ROSWELL NM
— 575-638 not yet reported which blocks → VALOR TELECOM TX,LP-NM #2 DBA WINDSTREAM COMM SW 1193 GALLINA NM
— 575-639 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAS CRUCES NM

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.