NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

2 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, last 30 days — NPA 571
ONVOY, LLC - VA 1
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 1
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
— 571-341 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
— 571-376 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
— 571-382 0XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN17 VA
— 571-407 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J WSNGTNZN19 VA
— 571-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX VA
— 571-413 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DULLES VA
— 571-427 0–9 XXXall 10 · 7 holders which blocks → TELNYX LLC 073H OCCOQUAN VA
— 571-431 1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 571-432 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN19 VA
— 571-433 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 WSNGTNZN08 VA
— 571-434 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 HERNDON VA
— 571-435 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
— 571-436 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
— 571-448 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
— 571-465 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 LEESBURG VA
— 571-469 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAYMARKET VA
— 571-493 0–9 XXXall 10 · 4 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 DALE CITY VA
— 571-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX VA
— 571-514 9XXX which blocks → PAETEC ITEL, LLC 829J HERNDON VA
— 571-521 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J HERNDON VA
— 571-522 0XXX2XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 BRADDOCK VA
— 571-526 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC - VA 138E HERNDON VA
— 571-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST VA
— 571-557 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
— 571-558 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
— 571-594 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
— 571-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX VA
— 571-633 5XXX which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 571-700 not yet reported which blocks → VA
— 571-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX VA
— 571-721 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN08 VA
— 571-722 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 WSNGTNZN17 VA
— 571-723 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN19 VA
— 571-777 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E WSNGTNZN08 VA
— 571-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX VA
— 571-831 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
— 571-900 not yet reported which blocks → VA
— 571-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX VA
— 571-921 0XXX2XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 MANASSAS VA
— 571-931 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J TRIANGLE VA
— 571-932 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J LORTONMTRO VA
— 571-933 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J DULLESMTRO VA
— 571-934 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J DULLES VA
— 571-936 not yet reported which blocks → WSNGTNZN08 VA
— 571-950 not yet reported which blocks → MULTIPLE OCN LISTING MULT VA
— 571-954 not yet reported which blocks → VA
— 571-958 not yet reported which blocks → MULTIPLE OCN LISTING MULT VA
— 571-959 not yet reported which blocks → MULTIPLE OCN LISTING MULT VA
— 571-976 not yet reported which blocks → 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.