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
2022-02-25 571-727 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J LORTON VA
2022-02-24 571-788 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J HAYMARKET VA
2022-02-18 571-688 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J INDENDNTHL VA
2022-02-18 571-742 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J DULLESMTRO VA
2022-02-18 571-746 0–9 XXXall 10 · 8 holders which blocks → TON80 COMMUNICATIONS, LLC 516J DULLES VA
2022-02-18 571-832 0–9 XXXall 10 · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BRADDOCK VA
2022-02-16 571-547 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2022-02-16 571-591 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2022-01-14 571-538 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2022-01-10 571-543 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F DALE CITY VA
2021-12-07 571-587 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2021-12-07 571-622 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2021-11-18 571-478 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2021-10-27 571-516 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TRIANGLE VA
2021-09-27 571-545 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2021-09-15 571-530 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2021-09-15 571-534 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 OCCOQUAN VA
2021-08-26 571-567 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H WSNGTNZN19 VA
2021-08-16 571-541 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2021-08-12 571-518 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2021-08-10 571-504 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H ENGLESIDE VA
2021-08-03 571-576 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - VA 138E MANASSAS VA
2021-06-04 571-686 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - VA 138E BRADDOCK VA
2021-04-30 571-615 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - VA 138E INDENDNTHL VA
2021-04-27 571-507 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN17 VA
2021-04-26 571-573 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H NOKESVILLE VA
2021-04-26 571-574 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H WSNGTNZN17 VA
2021-04-15 571-910 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E HERNDON VA
2021-04-14 571-646 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - VA 138E ENGLESIDE VA
2021-04-14 571-667 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - VA 138E LORTON VA
2021-04-06 571-866 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J OCCOQUAN VA
2021-03-09 571-773 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - VA 138E DULLESMTRO VA
2021-03-08 571-506 0–9 XXXall 10 · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2021-02-10 571-531 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2021-02-10 571-837 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J LEESBURG VA
2021-02-08 571-774 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - VA 138E TRIANGLE VA
2021-02-05 571-710 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H LORTON VA
2021-01-22 571-668 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E WSNGTNZN19 VA
2021-01-15 571-644 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
2021-01-14 571-503 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - VA 138E OCCOQUAN VA
2021-01-14 571-513 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DALE CITY VA
2021-01-14 571-561 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - VA 138E HAYMARKET VA
2021-01-13 571-588 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
2020-12-24 571-476 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN19 VA
2020-12-24 571-566 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN19 VA
2020-12-07 571-519 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2020-12-07 571-532 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2020-11-10 571-568 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - VA 138E MANASSAS VA
2020-10-27 571-479 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J LEESBURG VA
2020-10-15 571-556 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - VA 138E BRADDOCK 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.