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
2021-12-15 464-201 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OAK FOR SO IL
2021-12-15 502-886 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - KY 8406 LOUISVILLE KY
2021-12-15 520-632 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2021-12-15 615-437 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F CARTHAGE TN
2021-12-15 667-388 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SEVERN MD
2021-12-15 726-582 0–9 XXXall 10 · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SANANTONIO TX
2021-12-15 743-242 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J GREENSBORO NC
2021-12-15 773-560 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN06 IL
2021-12-15 804-713 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J MECHANCSVL VA
2021-12-15 810-296 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAPEER MI
2021-12-15 830-350 0–9 XXXall 10 · 2 holders which blocks → STPCS JOINT VENTURE, LLC 4290 DEL RIO TX
2021-12-15 878-249 4XXX8XXX9XXX · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 LEECHBURG PA
2021-12-15 929-570 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN10 NY
2021-12-15 929-598 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN14 NY
2021-12-15 929-606 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN04 NY
2021-12-15 929-607 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN05 NY
2021-12-15 929-608 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN11 NY
2021-12-15 929-609 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN13 NY
2021-12-15 936-323 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 CONROE TX
2021-12-15 956-658 0–9 XXXall 10 · 2 holders which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
2021-12-15 984-296 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J RALEIGH NC
2021-12-15 989-451 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SAGINAW MI
2021-12-14 225-471 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA 8764 LUTCHER LA
2021-12-14 239-383 0–9 XXXall 10 · 3 holders which blocks → MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 NAPLES FL
2021-12-14 256-949 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ANNISTON AL
2021-12-14 276-271 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 INDEPNDNCE VA
2021-12-14 319-407 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - IA 6266 WAVERLY IA
2021-12-14 346-534 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C TOMBALL TX
2021-12-14 352-890 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 LEESBURG FL
2021-12-14 352-931 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J LEESBURG FL
2021-12-14 352-932 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 LEESBURG FL
2021-12-14 386-318 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J DAYTONABCH FL
2021-12-14 423-738 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BRISTOL TN
2021-12-14 425-545 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 RENTON WA
2021-12-14 440-691 0–9 XXXall 10 · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CLEVELAND OH
2021-12-14 458-281 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F BEND OR
2021-12-14 458-282 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F COTTAGEGRV OR
2021-12-14 515-522 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 ALGONA IA
2021-12-14 515-588 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 EAGLEGROVE IA
2021-12-14 517-326 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J LANSING MI
2021-12-14 539-260 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BROKENARRW OK
2021-12-14 539-277 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F COWETA OK
2021-12-14 559-768 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 REEDLEY CA
2021-12-14 562-580 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
2021-12-14 585-604 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BATAVIA NY
2021-12-14 585-606 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 EROCHESTER NY
2021-12-14 650-609 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MILLBRAE CA
2021-12-14 662-905 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MS 992E LOUISVILLE MS
2021-12-14 667-386 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 ARBUTUS MD
2021-12-14 680-231 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 UTICA NY

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.