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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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 540-529 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 ROANOKE VA
— 540-532 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WINCHESTER VA
— 540-533 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WINCHESTER VA
— 540-535 5XXX6XXX8XXX9XXX which blocks → VERIZON VIRGINIA, INC. 9213 WINCHESTER VA
— 540-536 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WINCHESTER VA
— 540-537 9XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ROANOKE VA
— 540-538 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 FREDECKSBG VA
— 540-539 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WINCHESTER VA
— 540-542 9XXX which blocks → VERIZON VIRGINIA, INC. 9213 WINCHESTER VA
— 540-543 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON VIRGINIA, INC. 9213 MADISON VA
— 540-544 not yet reported which blocks → PEMBROKE TEL. COOP. 0243 NEWPORT VA
— 540-545 1XXX5XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 WINCHESTER VA
— 540-547 1XXX6XXX7XXX8XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 CULPEPER VA
— 540-548 5XXX6XXX7XXX9XXX · 4 holders which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 CHANCELLOR VA
— 540-550 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WINCHESTER VA
— 540-552 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 BLACKSBURG VA
— 540-553 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 BLACKSBURG VA
— 540-554 0XXX1XXX3XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → VERIZON VIRGINIA, INC. 9213 BLUEMONT VA
— 540-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST VA
— 540-556 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROANOKE VA
— 540-557 8XXX which blocks → VERIZON VIRGINIA, INC. 9213 BLACKSBURG VA
— 540-558 3XXX4XXX5XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 BLACKSBURG VA
— 540-559 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF VIRGINIA, INC. - VA 127G CROWSHMTIT VA
— 540-560 6XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HARRISONBG VA
— 540-561 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-562 8XXX which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-563 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-564 not yet reported which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 HARRISONBG VA
— 540-567 not yet reported which blocks → LUMOS TELEPHONE OF BOTETOURT LLC 0249 ORISKANY VA
— 540-568 not yet reported which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 HARRISONBG VA
— 540-570 none assigned yet which blocks → UNITED STATES CELLULAR - VA 6283 BUENAVISTA VA
— 540-572 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 8 holders which blocks → UNITED STATES CELLULAR - VA 6283 BUENAVISTA VA
— 540-574 not yet reported which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 HARRISONBG VA
— 540-576 none assigned yet which blocks → BRIGHTSPEED OF VIRGINIA, LLC 0254 UNION HALL VA
— 540-578 9XXX which blocks → METROPCS, INC. 5562 HARRISONBG VA
— 540-580 none assigned yet which blocks → UNITED STATES CELLULAR - VA 6283 ROANOKE VA
— 540-581 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-582 0XXX1XXX4XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 SPOTSYLVAN VA
— 540-583 3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BEDFORD VA
— 540-586 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 BEDFORD VA
— 540-587 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 BEDFORD VA
— 540-588 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 ROANOKE VA
— 540-589 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 ROANOKE VA
— 540-592 0XXX1XXX2XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → VERIZON VIRGINIA, INC. 9213 UPPERVILLE VA
— 540-593 not yet reported which blocks → CITIZENS TEL. COOP. 0225 BALLARD VA
— 540-599 none assigned yet which blocks → UNITED STATES CELLULAR - VA 6283 PEARISBURG VA
— 540-605 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BLACKSBURG VA
— 540-607 1XXX2XXX3XXX4XXX5XXX8XXX9XXX which blocks → METROPCS, INC. 5562 HARRISONBG VA
— 540-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX VA
— 540-612 not yet reported which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F HARRISONBG VA

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.