NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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, all time — NPA 540
VERIZON VIRGINIA, INC. 156
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 79
NEW CINGULAR WIRELESS PCS, LLC - DC 66
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 64
LEVEL 3 COMMUNICATIONS, LLC - VA 50
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
2018-06-26 540-516 0–9 XXXall 10 · 2 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 SHENANDHPK VA
2018-06-26 540-517 0–9 XXXall 10 · 3 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 SPERRYVL VA
2018-06-26 540-528 0–9 XXXwhole prefix which blocks → CORETEL VIRGINIA, LLC - VA 5832 THE PLAINS VA
2018-06-26 540-530 0–9 XXXall 10 · 2 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 UPPERVILLE VA
2018-06-25 540-697 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - VA 4644 WINCHESTER VA
2018-06-21 540-646 0XXX1XXX8XXX9XXX · 2 holders which blocks → VONAGE AMERICA LLC 197D HARRISONBG VA
2018-06-21 540-870 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H FREDECKSBG VA
2018-06-20 540-541 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H ROANOKE VA
2018-06-14 540-340 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E WARRENTON VA
2018-03-16 540-566 0–9 XXXall 10 · 7 holders which blocks → VONAGE AMERICA LLC 197D ROANOKE VA
2018-03-16 540-791 0XXX3XXX4XXX5XXX7XXX · 2 holders which blocks → VONAGE AMERICA LLC 197D CULPEPER VA
2018-02-16 540-619 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G MT GILEAD VA
2018-01-26 540-549 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MILL GAP VA
2018-01-26 540-601 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 BLUE GRASS VA
2018-01-26 540-648 2XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MONTEREY VA
2018-01-17 540-681 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - VA 4644 FREDECKSBG VA
2018-01-11 540-991 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - VA 4644 REMINGTON VA
2017-10-05 540-702 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J CHANCELLOR VA
2017-10-03 540-666 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E ROANOKE VA
2017-09-25 540-426 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 STAFFORD VA
2017-07-13 540-988 0–9 XXXall 10 · 4 holders which blocks → COMMIO, LLC 939H ROANOKE VA
2017-07-12 540-708 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → TELNYX LLC 073H CULPEPER VA
2017-06-30 540-403 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → AIRUS, INC. - VA 726H CULPEPER VA
2017-06-30 540-926 0–9 XXXall 10 · 5 holders which blocks → AIRUS, INC. - VA 726H ROANOKE VA
2017-06-28 540-799 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 RAPHINE VA
2017-05-19 540-640 0–9 XXXall 10 · 4 holders which blocks → COMMIO, LLC 939H CULPEPER VA
2017-04-14 540-274 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - VA 138E PULASKI VA
2017-03-14 540-701 0–9 XXXwhole prefix which blocks → ONVOY, LLC - VA 138E FREDECKSBG VA
2017-03-06 540-900 0–9 XXXwhole prefix which blocks → ONVOY, LLC - VA 138E ROANOKE VA
2017-02-24 540-600 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H LEXINGTON VA
2017-02-13 540-924 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F BUCHANAN VA
2017-01-27 540-945 0–9 XXXall 10 · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - VA 4644 ROANOKE VA
2016-12-05 540-655 0–9 XXXall 10 · 3 holders which blocks → TELNYX LLC 073H ROANOKE VA
2016-08-23 540-401 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G BERRYVILLE VA
2016-08-02 540-696 0–9 XXXall 10 · 8 holders which blocks → AT&T - LOCAL 7421 PEARISBURG VA
2016-06-30 540-418 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F BLACKSBURG VA
2016-06-23 540-390 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F HARTWOOD VA
2016-05-25 540-496 0XXX1XXX7XXX · 2 holders which blocks → PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G CULPEPER VA
2016-01-28 540-779 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - VA 138E STAFFORD VA
2016-01-04 540-698 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G SHAWSVILLE VA
2015-09-17 540-920 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GORDONSVL VA
2015-08-25 540-935 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WARRENTON VA
2015-08-12 540-928 1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → LUMOS TELEPHONE OF BOTETOURT LLC 0249 FINCASTLE VA
2015-06-23 540-385 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CHRISTISBG VA
2015-06-11 540-595 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G ROANOKE VA
2015-06-08 540-755 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J CHANCELLOR VA
2015-01-23 540-495 0XXX1XXX5XXX8XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F CALVERTON VA
2015-01-23 540-883 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F MIDDLEBURG VA
2014-10-10 540-486 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WINCHESTER VA
2014-10-01 540-739 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 BLACKSBURG VA

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.