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
2020-08-05 540-690 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WARRENTON VA
2020-07-14 540-844 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H DAHLGREN VA
2020-07-13 540-240 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H ROANOKE VA
2020-06-11 540-694 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 STEPHENSCY VA
2020-05-28 540-927 2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → CITIZENS TELEPHONE COOPERATIVE - VA 544A BENT MT VA
2020-05-18 540-730 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELNYX LLC 073H KEEZLETOWN VA
2020-05-12 540-880 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - VA 138E BROWNSBURG VA
2020-05-11 540-202 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - VA 138E THE PLAINS VA
2020-04-09 540-780 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - VA 138E MT GILEAD VA
2020-04-09 540-781 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - VA 138E BLUEMONT VA
2020-02-20 540-210 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - VA 138E CALVERTON VA
2020-02-18 540-575 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → CSC WIRELESS, LLC 425J HARRISONBG VA
2020-02-18 540-590 0–9 XXXwhole prefix which blocks → ONVOY, LLC - VA 138E ROCKYMOUNT VA
2020-01-16 540-783 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 STAFFORD VA
2019-11-07 540-573 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - VA 4644 PULASKI VA
2019-10-09 540-706 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J FREDECKSBG VA
2019-09-06 540-594 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G MINERAL VA
2019-07-18 540-299 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CHRISTISBG VA
2019-07-10 540-792 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CULPEPER VA
2019-05-07 540-584 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F GROTTOES VA
2019-04-10 540-546 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - VA 138E WINCHESTER VA
2019-04-10 540-782 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F STANLEY VA
2019-03-25 540-802 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MONTVALE VA
2019-03-20 540-800 0–9 XXXall 10 · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J CULPEPER VA
2019-03-18 540-475 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J NARROWS VA
2019-03-07 540-500 0–9 XXXall 10 · 7 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 LOUISA VA
2019-03-05 540-766 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 NATURALBDG VA
2019-02-19 540-716 0XXX1XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LEXINGTON VA
2019-01-18 540-952 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - VA 4644 BLACKSBURG VA
2018-12-19 540-531 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MCCLUNG VA
2018-12-19 540-608 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MOUNTANGRV VA
2018-12-19 540-637 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MCDOWELL VA
2018-12-19 540-916 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WILLIAMSVL VA
2018-12-07 540-859 0XXX1XXX3XXX5XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 GORDONSVL VA
2018-12-06 540-417 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E MCGAHEYSVL VA
2018-12-04 540-917 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BERRYVILLE VA
2018-11-27 540-534 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E HARRISONBG VA
2018-11-27 540-944 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D BLACKSBURG VA
2018-11-01 540-386 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G HARTWOOD VA
2018-09-12 540-918 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F SHENANDOAH VA
2018-08-20 540-410 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - VA 138E STONE MT VA
2018-08-09 540-902 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J GREENWOOD VA
2018-06-26 540-281 0–9 XXXall 10 · 4 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 BLUEMONT VA
2018-06-26 540-306 0–9 XXXall 10 · 4 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 BOYCE VA
2018-06-26 540-472 0–9 XXXall 10 · 4 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 BROKENBURG VA
2018-06-26 540-501 0–9 XXXall 10 · 3 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 CRIGLERSVL VA
2018-06-26 540-502 0–9 XXXall 10 · 2 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 GAINESBORO VA
2018-06-26 540-503 0–9 XXXall 10 · 3 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 GORE VA
2018-06-26 540-506 0–9 XXXall 10 · 2 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 MARSHALL VA
2018-06-26 540-513 0–9 XXXall 10 · 6 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 ORANGE 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.