NumberResearch Membership · Data 09/28/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/28/2026

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 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
2020-07-21 249-867 not yet reported which blocks → TELUS Mobility 8303 Alliston —
2020-07-21 319-326 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E INDEPNDNCE IA
2020-07-21 343-463 not yet reported which blocks → TELUS Mobility 8303 Ottawa-Hull —
2020-07-21 351-356 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H LEOMINSTER MA
2020-07-21 365-915 not yet reported which blocks → ISP Telecom Inc. 4727 Beamsville —
2020-07-21 365-916 not yet reported which blocks → ISP Telecom Inc. 4727 Dunnville —
2020-07-21 365-917 not yet reported which blocks → ISP Telecom Inc. 4727 Niagara-On-The-Lake —
2020-07-21 365-918 not yet reported which blocks → ISP Telecom Inc. 4727 Vineland —
2020-07-21 409-258 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GALVESTON TX
2020-07-21 413-722 0XXX1XXX2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → FRACTEL, LLC 965H CONWAY MA
2020-07-21 423-654 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J CHATTNOOGA TN
2020-07-21 469-852 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL 9533 DALLAS TX
2020-07-21 475-336 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H DARIEN CT
2020-07-21 475-345 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H BRIDGEPORT CT
2020-07-21 475-455 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ANSONIDRBY CT
2020-07-21 475-688 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H MERIDEN CT
2020-07-21 475-946 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H OLDGRNWICH CT
2020-07-21 478-303 0–9 XXXall 10 · 3 holders which blocks → CSC WIRELESS, LLC 425J MACON GA
2020-07-21 515-786 2XXX3XXX5XXX7XXX · 2 holders which blocks → FRACTEL, LLC 965H OTHO IA
2020-07-21 515-944 4XXX9XXX · 2 holders which blocks → FRACTEL, LLC 965H WEST BEND IA
2020-07-21 530-614 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SHINGLESPG CA
2020-07-21 563-348 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H DUBUQUE IA
2020-07-21 563-465 0XXX3XXX4XXX6XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H FARLEY IA
2020-07-21 563-758 1XXX6XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H WORTHINGTN IA
2020-07-21 563-877 1XXX7XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H EARLVILLE IA
2020-07-21 629-248 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F NASHVILLE TN
2020-07-21 641-688 2XXX5XXX6XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H TINGLEY IA
2020-07-21 641-955 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H MONROE IA
2020-07-21 641-977 3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H NEW SHARON IA
2020-07-21 762-250 0–9 XXXall 10 · 2 holders which blocks → CSC WIRELESS, LLC 425J AUGUSTA GA
2020-07-21 808-867 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H WAILUKU HI
2020-07-21 838-481 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WESTELCOM NETWORK, INC. - NY 1227 MALONE NY
2020-07-21 848-293 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PERTHAMBOY NJ
2020-07-21 857-766 0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H SO BOSTON MA
2020-07-21 920-201 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J APPLETON WI
2020-07-21 956-552 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 LAREDO TX
2020-07-21 959-234 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H NORWICH CT
2020-07-21 959-345 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H DANIELSON CT
2020-07-21 959-356 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H HADDAM CT
2020-07-21 959-529 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H HARTFORD CT
2020-07-21 959-946 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H STAFFD SPG CT
2020-07-20 249-389 not yet reported which blocks → Fibernetics Corporation 464D Bala —
2020-07-20 249-390 not yet reported which blocks → Fibernetics Corporation 464D Bracebridge —
2020-07-20 249-391 not yet reported which blocks → Fibernetics Corporation 464D Burk's Falls —
2020-07-20 249-392 not yet reported which blocks → Fibernetics Corporation 464D Dorset —
2020-07-20 249-393 not yet reported which blocks → Fibernetics Corporation 464D Mactier —
2020-07-20 365-870 not yet reported which blocks → ISP Telecom Inc. 4727 Caledon East —
2020-07-20 365-871 not yet reported which blocks → ISP Telecom Inc. 4727 Castlemore —
2020-07-20 365-872 not yet reported which blocks → ISP Telecom Inc. 4727 Snelgrove —
2020-07-20 672-985 not yet reported which blocks → TELUS Mobility 8301 Aldergrove —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/28/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.