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
2021-02-17 209-512 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F YOSEMITE CA
2021-02-17 249-517 not yet reported which blocks → ISP Telecom Inc. 4727 Hastings —
2021-02-17 249-518 not yet reported which blocks → ISP Telecom Inc. 4727 Lakefield —
2021-02-17 249-536 not yet reported which blocks → ISP Telecom Inc. 4727 Chelmsford —
2021-02-17 530-789 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H MARYSVILLE CA
2021-02-17 548-250 not yet reported which blocks → ISP Telecom Inc. 4727 Corunna —
2021-02-17 579-425 not yet reported which blocks → Cooptel 818D Joliette —
2021-02-17 579-426 not yet reported which blocks → Cooptel 818D St-Jacques —
2021-02-17 579-427 not yet reported which blocks → Cooptel 818D Ste-Julienne —
2021-02-17 579-428 not yet reported which blocks → Cooptel 818D L'Epiphanie-l'Assomption —
2021-02-17 657-491 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2021-02-17 657-789 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ANAHEIM CA
2021-02-17 669-677 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H CAMPBELL CA
2021-02-17 858-305 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNDG MRMS CA
2021-02-16 239-365 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 FTMYERSBCH FL
2021-02-16 239-893 0–9 XXXall 10 · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J CAPE CORAL FL
2021-02-16 308-877 0XXX which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LOOMIS NE
2021-02-16 308-985 0XXX1XXX2XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K OVERTON NE
2021-02-16 313-536 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2021-02-16 316-710 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H WICHITA KS
2021-02-16 341-345 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H FRNK MAIN CA
2021-02-16 361-787 3XXX4XXX7XXX8XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K SEADRIFT TX
2021-02-16 385-766 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H ALTA UT
2021-02-16 447-247 0XXX1XXX3XXX4XXX7XXX · 4 holders which blocks → FRACTEL, LLC 965H LODA IL
2021-02-16 447-336 0XXX1XXX3XXX6XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H MT PULASKI IL
2021-02-16 447-348 0XXX1XXX2XXX6XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H NEW BERLIN IL
2021-02-16 447-432 0XXX1XXX2XXX4XXX8XXX · 4 holders which blocks → FRACTEL, LLC 965H LUDLOW IL
2021-02-16 447-667 0XXX1XXX2XXX6XXX7XXX8XXX · 6 holders which blocks → FRACTEL, LLC 965H OGDEN IL
2021-02-16 447-758 6XXX7XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H ILLIOPOLIS IL
2021-02-16 447-786 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → FRACTEL, LLC 965H HARRISTOWN IL
2021-02-16 447-842 0XXX1XXX2XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H DIVERNON IL
2021-02-16 447-946 0XXX1XXX3XXX4XXX6XXX · 4 holders which blocks → FRACTEL, LLC 965H MODESTO IL
2021-02-16 475-260 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H HUNTINGTON CT
2021-02-16 505-394 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 GALLUP NM
2021-02-16 509-516 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WALLAWALLA WA
2021-02-16 515-565 0XXX1XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → ONVOY, LLC - IA 221F LIVERMORE IA
2021-02-16 516-879 0–9 XXXall 10 · 5 holders which blocks → UCOMTEL INC. 534J NASSAUZN05 NY
2021-02-16 516-893 0–9 XXXall 10 · 6 holders which blocks → HD CARRIER LLC 321J NASSAUZN01 NY
2021-02-16 516-896 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J NASSAUZN02 NY
2021-02-16 562-539 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F NORWALK CA
2021-02-16 564-209 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 WHATCOMCTY WA
2021-02-16 575-246 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ROSWELL NM
2021-02-16 661-627 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SNCA NHCS CA
2021-02-16 680-529 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H CHITTENNGO NY
2021-02-16 716-469 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J NIAGARAFLS NY
2021-02-16 845-646 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → UCOMTEL INC. 534J SLOATSBURG NY
2021-02-16 850-954 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H CRAWFORDVL FL
2021-02-16 850-989 0–9 XXXall 10 · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H MUNSON FL
2021-02-16 850-993 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H CHERRYLAKE FL
2021-02-16 914-431 0–9 XXXall 10 · 3 holders which blocks → UCOMTEL INC. 534J WSCHSTZN05 NY

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.