NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
2020-05-21 579-889 not yet reported which blocks → ISP Telecom Inc. 4727 St-Blaise —
2020-05-21 579-890 not yet reported which blocks → ISP Telecom Inc. 4727 St-Zenon —
2020-05-21 579-891 not yet reported which blocks → ISP Telecom Inc. 4727 Yamaska —
2020-05-21 579-892 not yet reported which blocks → ISP Telecom Inc. 4727 Actonvale —
2020-05-21 605-316 0–9 XXXall 10 · 5 holders which blocks → AIRUS, INC. - SD 580H IROQUOIS SD
2020-05-21 629-877 0XXX1XXX4XXX5XXX · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J TRIUNE TN
2020-05-21 762-251 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ELBERTON GA
2020-05-21 873-879 not yet reported which blocks → ISP Telecom Inc. 4727 Chelsea —
2020-05-20 207-816 0–9 XXXall 10 · 6 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 AUGUSTA ME
2020-05-20 216-329 0–9 XXXall 10 · 2 holders which blocks → CSC WIRELESS, LLC 425J CLEVELAND OH
2020-05-20 223-300 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H BROGUE PA
2020-05-20 223-345 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CHAMBERSBG PA
2020-05-20 223-356 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H INTERCOURS PA
2020-05-20 223-500 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H JEFFERSON PA
2020-05-20 223-600 0XXX1XXX4XXX5XXX6XXX · 3 holders which blocks → FRACTEL, LLC 965H LIVERPOOL PA
2020-05-20 223-766 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H MERCERSBG PA
2020-05-20 234-274 0–9 XXXall 10 · 3 holders which blocks → CSC WIRELESS, LLC 425J AKRON OH
2020-05-20 343-891 not yet reported which blocks → ISP Telecom Inc. 4727 Casselman —
2020-05-20 365-896 not yet reported which blocks → ISP Telecom Inc. 4727 Brooklin —
2020-05-20 365-897 not yet reported which blocks → ISP Telecom Inc. 4727 Orono —
2020-05-20 365-907 not yet reported which blocks → ISP Telecom Inc. 4727 Fisherville —
2020-05-20 365-908 not yet reported which blocks → ISP Telecom Inc. 4727 Selkirk —
2020-05-20 531-241 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - NE 7144 OMAHA NE
2020-05-20 548-875 not yet reported which blocks → ISP Telecom Inc. 4727 Leamington —
2020-05-20 548-876 not yet reported which blocks → ISP Telecom Inc. 4727 Tecumseh —
2020-05-20 567-304 0–9 XXXall 10 · 6 holders which blocks → CSC WIRELESS, LLC 425J TOLEDO OH
2020-05-20 567-306 0–9 XXXall 10 · 2 holders which blocks → CSC WIRELESS, LLC 425J MANSFIELD OH
2020-05-20 580-844 0XXX5XXX8XXX9XXX · 2 holders which blocks → TERRA NOVA TELECOM INC. 145J HITCHCOCK OK
2020-05-20 682-900 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H FORT WORTH TX
2020-05-20 731-877 0XXX1XXX3XXX8XXX9XXX · 5 holders which blocks → TERRA NOVA TELECOM INC. 145J GLEASON TN
2020-05-20 743-209 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J GREENSBORO NC
2020-05-20 828-220 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J ASHEVILLE NC
2020-05-20 865-855 0–9 XXXall 10 · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J CLINTON TN
2020-05-20 910-756 0–9 XXXall 10 · 3 holders which blocks → CSC WIRELESS, LLC 425J WILMINGTON NC
2020-05-20 910-806 0–9 XXXall 10 · 7 holders which blocks → CSC WIRELESS, LLC 425J FAYETTEVL NC
2020-05-20 937-784 0–9 XXXall 10 · 2 holders which blocks → CSC WIRELESS, LLC 425J DAYTON OH
2020-05-20 954-751 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - FL 982E POMPANOBCH FL
2020-05-20 980-316 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J CHARLOTTE NC
2020-05-19 202-451 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN1 DC
2020-05-19 249-897 not yet reported which blocks → ISP Telecom Inc. 4727 Chapleau —
2020-05-19 249-898 not yet reported which blocks → ISP Telecom Inc. 4727 Spanish —
2020-05-19 343-890 not yet reported which blocks → ISP Telecom Inc. 4727 Almonte —
2020-05-19 438-475 not yet reported which blocks → Bell Mobility 6574 Montreal —
2020-05-19 469-830 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F LEWISVILLE TX
2020-05-19 479-386 0XXX1XXX6XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 DECATUR AR
2020-05-19 548-722 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Waterford —
2020-05-19 548-878 not yet reported which blocks → ISP Telecom Inc. 4727 Wallaceburg —
2020-05-19 561-492 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 BOCA RATON FL
2020-05-19 661-499 0–9 XXXall 10 · 4 holders which blocks → AIRESPRING, INC. 996H LANCASTER CA
2020-05-19 669-301 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D SNJS SOUTH CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.