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
2014-08-15 540-634 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 MINERAL VA
2014-07-22 540-215 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - VA 138E BROADWAY VA
2014-02-27 540-699 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J STAFFORD VA
2014-02-21 540-485 3XXX4XXX5XXX7XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J CULPEPER VA
2014-01-17 540-388 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J CHANCELLOR VA
2013-11-19 540-787 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K PEARISBURG VA
2013-10-21 540-773 0–9 XXXall 10 · 7 holders which blocks → SHENTEL COMMUNICATIONS, LLC. - VA 4979 WINCHESTER VA
2013-06-21 540-970 0–9 XXXall 10 · 6 holders which blocks → CITIZENS TELEPHONE COOPERATIVE - VA 544A ROANOKE VA
2013-03-08 540-393 0XXX1XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J ROCKYMOUNT VA
2013-03-08 540-795 0–9 XXXall 10 · 8 holders which blocks → NUSO, LLC 551G ROANOKE VA
2013-03-08 540-881 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 551G CULPEPER VA
2013-01-18 540-680 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WARRENTON VA
2012-09-26 540-596 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CASTLE TEL. CO. 3029 NEW CASTLE VA
2012-09-12 540-750 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 BLACKSBURG VA
2012-06-07 540-509 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F PULASKI VA
2012-05-17 540-676 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ROANOKE VA
2012-04-23 540-356 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J HARTWOOD VA
2011-12-20 540-217 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J HARRISONBG VA
2011-12-20 540-225 0–9 XXXall 10 · 9 holders which blocks → COMCAST IP PHONE, LLC 318J STANLEY VA
2011-12-09 540-613 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 ROANOKE VA
2011-12-09 540-835 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 RADFORD VA
2011-12-02 540-732 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J UNIONVILLE VA
2011-09-15 540-685 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ROANOKE VA
2011-07-15 540-759 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 ROANOKE VA
2011-06-09 540-627 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ROANOKE VA
2011-04-18 540-642 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F FREDECKSBG VA
2011-02-15 540-638 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 367E HARRISONBG VA
2011-02-09 540-492 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 ROANOKE VA
2011-01-06 540-603 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J LOUISA VA
2010-11-08 540-519 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ROANOKE VA
2010-10-19 540-728 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 ROANOKE VA
2010-09-24 540-398 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 WINCHESTER VA
2010-09-08 540-259 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 MINERAL VA
2010-09-08 540-838 0–9 XXXall 10 · 8 holders which blocks → SHENTEL COMMUNICATIONS, LLC. - VA 4979 RADFORD VA
2010-08-23 540-214 0–9 XXXall 10 · 4 holders which blocks → SHENTEL COMMUNICATIONS, LLC. - VA 4979 HARRISONBG VA
2010-08-13 540-524 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 ROANOKE VA
2010-07-28 540-252 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 FRONTROYAL VA
2010-06-15 540-602 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 STAFFORD VA
2010-06-01 540-508 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J STEPHENSCY VA
2010-05-24 540-523 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J ROANOKE VA
2009-12-31 540-610 not yet reported which blocks → MGW NETWORKS, L.L.C. - VA 609F DEERFIELD VA
2009-11-13 540-712 0–9 XXXall 10 · 7 holders which blocks → MGW NETWORKS, L.L.C. - VA 609F STAUNTON VA
2009-10-30 540-505 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 RADFORD VA
2009-08-12 540-300 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 STAFFORD VA
2009-07-06 540-251 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CHRISTISBG VA
2009-06-12 540-315 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 BLACKSBURG VA
2009-06-10 540-494 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - VA 4644 ROANOKE VA
2009-06-08 540-282 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - VA 4644 HARRISONBG VA
2009-06-08 540-376 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - VA 4644 FREDECKSBG VA
2009-05-20 540-865 0–9 XXXall 10 · 3 holders which blocks → SHENTEL COMMUNICATIONS, LLC. - VA 4979 CLIFTNFORG 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.