NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

357 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 27
ONVOY, LLC - NJ 20
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
2022-08-12 253-308 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2022-08-12 256-969 0–9 XXXall 10 · 2 holders which blocks → HD CARRIER LLC 321J HUNTSVILLE AL
2022-08-12 272-294 1XXX2XXX3XXX9XXX · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J AVIS PA
2022-08-12 279-226 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 RSVL MAIN CA
2022-08-12 331-289 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 HINSDALE IL
2022-08-12 346-579 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 DICKINSON TX
2022-08-12 365-466 not yet reported which blocks → Fibernetics Corporation 464D Cayuga —
2022-08-12 365-467 not yet reported which blocks → Fibernetics Corporation 464D Dunnville —
2022-08-12 365-468 not yet reported which blocks → Fibernetics Corporation 464D Fisherville —
2022-08-12 365-469 not yet reported which blocks → Fibernetics Corporation 464D Port Robinson —
2022-08-12 365-470 not yet reported which blocks → Fibernetics Corporation 464D Ridgeway —
2022-08-12 365-471 not yet reported which blocks → Fibernetics Corporation 464D Selkirk —
2022-08-12 365-472 not yet reported which blocks → Fibernetics Corporation 464D Stevensville —
2022-08-12 365-473 not yet reported which blocks → Fibernetics Corporation 464D Wainfleet —
2022-08-12 365-474 not yet reported which blocks → Fibernetics Corporation 464D Wellandport —
2022-08-12 417-301 0XXX1XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J ANDERSON MO
2022-08-12 417-375 0XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J NOEL MO
2022-08-12 424-470 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BEVERLYHLS CA
2022-08-12 475-314 0–9 XXXall 10 · 6 holders which blocks → HD CARRIER LLC 321J HUNTINGTON CT
2022-08-12 557-500 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H ST LOUIS MO
2022-08-12 571-563 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H HERNDON VA
2022-08-12 573-806 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRCH TREE MO
2022-08-12 582-217 6XXX7XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J MEYERSDALE PA
2022-08-12 582-218 0XXX1XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J TYRONE PA
2022-08-12 626-640 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LA PUENTE CA
2022-08-12 657-615 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ANAHEIM CA
2022-08-12 680-244 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 SYRACUSE NY
2022-08-12 682-387 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 GRANBURY TX
2022-08-12 682-389 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 GRANBURY TX
2022-08-12 719-670 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 ALAMOSA CO
2022-08-12 720-786 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2022-08-12 720-860 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H DENVER CO
2022-08-12 743-253 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 WINSTN SAL NC
2022-08-12 762-315 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - GA 983E ATHENS GA
2022-08-12 762-316 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ATHENS GA
2022-08-12 816-574 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H KANSASCITY MO
2022-08-12 816-991 0XXX1XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J FREEMAN MO
2022-08-12 817-384 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H FORT WORTH TX
2022-08-12 830-289 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 UVALDE TX
2022-08-12 840-213 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 REDLANDS CA
2022-08-12 840-214 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MARSHALL CA
2022-08-12 859-515 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H LEXINGTON KY
2022-08-12 910-956 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 SCOTTSHILL NC
2022-08-12 915-334 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H EL PASO TX
2022-08-12 928-435 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BULLHEADCY AZ
2022-08-12 954-904 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H POMPANOBCH FL
2022-08-11 343-709 not yet reported which blocks → Distributel 082E Bancroft —
2022-08-11 343-710 not yet reported which blocks → Distributel 082E Belleville —
2022-08-11 343-734 not yet reported which blocks → Distributel 082E Brighton —
2022-08-11 343-735 not yet reported which blocks → Distributel 082E Frankford —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.