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
2020-09-15 571-416 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J LEESBURG VA
2020-09-04 571-473 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J WSNGTNZN08 VA
2020-08-17 571-895 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J WSNGTNZN08 VA
2020-07-27 571-877 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H LORTONMTRO VA
2020-07-14 571-470 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN19 VA
2020-07-10 571-544 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H WSNGTNZN19 VA
2020-07-10 571-677 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H DALE CITY VA
2020-07-10 571-755 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H HAYMARKET VA
2020-07-10 571-786 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H HERNDON VA
2020-07-10 571-899 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H WSNGTNZN17 VA
2020-07-10 571-946 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H MANASSAS VA
2020-07-10 571-977 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H WSNGTNZN08 VA
2020-06-10 571-701 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - VA 138E NOKESVILLE VA
2020-06-10 571-901 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E ENGLESIDE VA
2020-05-18 571-517 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - VA 138E DULLES VA
2020-05-14 571-475 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D BRADDOCK VA
2020-05-12 571-601 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E LEESBURG VA
2020-05-11 571-520 0–9 XXXwhole prefix which blocks → ONVOY, LLC - VA 138E HERNDON VA
2020-05-11 571-771 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - VA 138E WSNGTNZN08 VA
2020-05-08 571-998 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - VA 138E INDENDNTHL VA
2020-04-09 571-467 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2020-04-08 571-460 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN19 VA
2020-03-31 571-462 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 OCCOQUAN VA
2020-03-09 571-456 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TRIANGLE VA
2020-02-05 571-453 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2020-01-31 571-450 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F LORTON VA
2020-01-07 571-430 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2019-12-20 571-461 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN17 VA
2019-12-20 571-496 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LORTONMTRO VA
2019-11-20 571-554 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 DALE CITY VA
2019-11-06 571-537 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-06 571-539 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-10-31 571-410 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - VA 138E LEESBURG VA
2019-09-23 571-497 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 OCCOQUAN VA
2019-09-12 571-464 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2019-09-06 571-498 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF VIRGINIA, LLC - VA 275G LEESBURG VA
2019-08-27 571-454 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MANASSAS VA
2019-08-20 571-621 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2019-08-13 571-695 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2019-08-01 571-415 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HAYMARKET VA
2019-07-16 571-776 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2019-07-10 571-463 0–9 XXXall 10 · 4 holders which blocks → VOIP INNOVATIONS, LLC 597F ARCOLA VA
2019-07-09 571-487 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARCOLA VA
2019-03-28 571-600 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J DULLESMTRO VA
2019-03-28 571-833 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MANASSAS VA
2019-03-15 571-400 0–9 XXXall 10 · 5 holders which blocks → TERRA NOVA TELECOM INC. 145J WSNGTNZN08 VA
2019-03-15 571-440 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 LEESBURG VA
2019-03-11 571-536 0–9 XXXall 10 · 3 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 WSNGTNZN19 VA
2019-03-11 571-697 0–9 XXXall 10 · 6 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 TRIANGLE VA
2019-03-11 571-842 0–9 XXXall 10 · 5 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 WSNGTNZN08 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.