NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 — NPA 956
8X8, INC. 1
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
— 956-514 not yet reported which blocks → SOUTHWESTERN BELL 9533 MERCEDES TX
— 956-519 not yet reported which blocks → SOUTHWESTERN BELL 9533 MISSION TX
— 956-532 3XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 WESLACO TX
— 956-535 6XXX which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-541 not yet reported which blocks → SOUTHWESTERN BELL 9533 BROWNSVL TX
— 956-542 not yet reported which blocks → SOUTHWESTERN BELL 9533 BROWNSVL TX
— 956-544 not yet reported which blocks → SOUTHWESTERN BELL 9533 BROWNSVL TX
— 956-545 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BROWNSVL TX
— 956-546 not yet reported which blocks → SOUTHWESTERN BELL 9533 BROWNSVL TX
— 956-547 0XXX which blocks → SOUTHWESTERN BELL 9533 BROWNSVL TX
— 956-548 not yet reported which blocks → SOUTHWESTERN BELL 9533 BROWNSVL TX
— 956-550 5XXX which blocks → SOUTHWESTERN BELL 9533 BROWNSVL TX
— 956-551 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 BROWNSVL TX
— 956-553 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H HARLINGEN TX
— 956-554 1XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BROWNSVL TX
— 956-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST TX
— 956-565 not yet reported which blocks → SOUTHWESTERN BELL 9533 MERCEDES TX
— 956-568 not yet reported which blocks → TWC IP ENABLED SERVICES, LLC 793K LAREDO TX
— 956-571 none assigned yet which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-572 5XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BROWNSVL TX
— 956-574 1XXX2XXX4XXX which blocks → SOUTHWESTERN BELL 9533 BROWNSVL TX
— 956-580 not yet reported which blocks → SOUTHWESTERN BELL 9533 MISSION TX
— 956-581 not yet reported which blocks → SOUTHWESTERN BELL 9533 MISSION TX
— 956-583 8XXX which blocks → SOUTHWESTERN BELL 9533 MISSION TX
— 956-584 not yet reported which blocks → SOUTHWESTERN BELL 9533 MISSION TX
— 956-585 not yet reported which blocks → SOUTHWESTERN BELL 9533 MISSION TX
— 956-605 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EDINBURG TX
— 956-607 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EDINBURG TX
— 956-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 956-618 not yet reported which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-621 6XXX7XXX8XXX9XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BROWNSVL TX
— 956-627 7XXX8XXX9XXX which blocks → TWC IP ENABLED SERVICES, LLC 793K MCALLEN TX
— 956-630 not yet reported which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-631 not yet reported which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-632 not yet reported which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-636 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SANTA ROSA TX
— 956-642 none assigned yet which blocks → VALLEY TEL. COOP., INC. 2159 LASARA TX
— 956-645 not yet reported which blocks → STPCS JOINT VENTURE, LLC 4290 LAREDO TX
— 956-648 none assigned yet which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
— 956-657 not yet reported which blocks → SMARTCOM TELEPHONE, LLC 4866 MCALLEN TX
— 956-659 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-661 8XXX which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-664 not yet reported which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-668 not yet reported which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-682 not yet reported which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-683 5XXX6XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-686 not yet reported which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-687 not yet reported which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-688 0XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-689 0XXX which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 RAYMONDVL TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.