NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

358 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 31
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
ONVOY, LLC - NJ 15
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
— 703-518 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-519 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-520 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 BRADDOCK VA
— 703-521 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-522 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-524 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-525 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-526 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-527 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-528 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-529 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-530 not yet reported which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 MANASSAS VA
— 703-531 7XXX8XXX9XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 703-532 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 703-533 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 703-534 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 703-535 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-536 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 703-537 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN19 VA
— 703-538 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 703-539 0–9 XXXall 10 · 8 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN19 VA
— 703-541 8XXX9XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-542 2XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARCOLA VA
— 703-543 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BRADDOCK VA
— 703-544 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DULLES VA
— 703-545 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-546 2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
— 703-547 7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
— 703-548 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-549 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-550 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-551 3XXX which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 LORTON VA
— 703-552 4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DULLESMTRO VA
— 703-553 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST VA
— 703-556 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 703-557 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-558 9XXX which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 703-560 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 703-561 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN19 VA
— 703-562 2XXX6XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
— 703-563 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN19 VA
— 703-564 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN17 VA
— 703-565 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J DALE CITY VA
— 703-566 not yet reported which blocks → COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
— 703-567 9XXX which blocks → COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
— 703-568 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
— 703-569 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 703-570 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 DULLESMTRO VA
— 703-572 not yet reported which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 DULLESMTRO VA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.