NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 21
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
2022-01-09 582-895 0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J ALTOONA PA
2022-01-09 636-351 0XXX1XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J OFALLON MO
2022-01-09 808-743 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 WAILUKU HI
2022-01-08 520-633 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2022-01-08 608-508 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 WESTFIELD WI
2022-01-08 734-643 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WYANDOTTE MI
2022-01-08 734-683 5XXX which blocks → TON80 COMMUNICATIONS, LLC 516J GREGORY MI
2022-01-08 734-684 0XXX2XXX3XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J IDA MI
2022-01-08 878-253 0XXX1XXX6XXX7XXX8XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MONESSEN PA
2022-01-08 878-433 0XXX1XXX2XXX6XXX8XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CLAIRTON PA
2022-01-07 206-746 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2022-01-07 213-649 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 11 CA
2022-01-07 213-837 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J LSAN DA 09 CA
2022-01-07 219-837 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J LAKE STA IN
2022-01-07 224-450 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALGONQUIN IL
2022-01-07 225-476 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 BATONROUGE LA
2022-01-07 253-349 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2022-01-07 262-575 5XXX8XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BERGEN WI
2022-01-07 269-546 0XXX1XXX4XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NEWBUFFALO MI
2022-01-07 272-462 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WELLSBORO PA
2022-01-07 279-782 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J FAIR OAKS CA
2022-01-07 321-381 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J MELBOURNE FL
2022-01-07 331-837 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J W CHICAGO IL
2022-01-07 332-257 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
2022-01-07 343-676 not yet reported which blocks → Fibernetics Corporation 464D Long Sault —
2022-01-07 343-678 not yet reported which blocks → Fibernetics Corporation 464D Martintown —
2022-01-07 343-679 not yet reported which blocks → Fibernetics Corporation 464D Maxville —
2022-01-07 343-680 not yet reported which blocks → Fibernetics Corporation 464D Morrisburg —
2022-01-07 346-837 0–9 XXXall 10 · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BAMMEL TX
2022-01-07 351-688 8XXX which blocks → TON80 COMMUNICATIONS, LLC 516J GEORGETOWN MA
2022-01-07 352-741 0–9 XXXall 10 · 6 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J BROOKSVL FL
2022-01-07 380-837 0XXX1XXX4XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J GROVEPORT OH
2022-01-07 414-742 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MILWAUKZN4 WI
2022-01-07 424-471 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 REDONDO CA
2022-01-07 424-728 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CMTN GRDN CA
2022-01-07 430-837 0XXX4XXX8XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BELLSSAVOY TX
2022-01-07 440-798 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J AMHERST OH
2022-01-07 442-375 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 OCSD OCSD CA
2022-01-07 442-532 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J EL CENTRO CA
2022-01-07 463-337 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NEWPALSTIN IN
2022-01-07 470-935 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - GA 8392 GRIFFIN GA
2022-01-07 475-342 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ANSONIDRBY CT
2022-01-07 475-746 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J STAMFORD CT
2022-01-07 517-893 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J LANSING MI
2022-01-07 520-613 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2022-01-07 534-227 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J COLBY WI
2022-01-07 562-783 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WHITTIER CA
2022-01-07 564-219 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
2022-01-07 582-208 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 REYNOLDSVL PA
2022-01-07 612-477 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 TWINCITIES MN

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.