NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

360 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 26
Rogers Communications Canada Inc. (Wireless) 23
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
— 656-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT FL
— 656-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT FL
— 656-700 not yet reported which blocks → FL
— 656-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT FL
— 656-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT FL
— 656-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT FL
— 656-950 not yet reported which blocks → FL
— 656-958 not yet reported which blocks → FL
— 656-959 not yet reported which blocks → FL
— 656-976 not yet reported which blocks → FL
— 657-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 657-222 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C CYPRESS CA
— 657-255 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C BUENA PARK CA
— 657-256 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C CYPRESS CA
— 657-261 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C SANTA ANA CA
— 657-267 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SANTA ANA CA
— 657-300 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CA 649C HUNTITNBCH CA
— 657-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 657-315 0–9 XXXall 10 · 8 holders which blocks → AT&T ENTERPRISES, LLC 516C PLACENTIA CA
— 657-331 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C ANAHEIM CA
— 657-333 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
— 657-336 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
— 657-347 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ANAHEIM CA
— 657-357 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SANTA ANA CA
— 657-364 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
— 657-400 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C WESTMINSTR CA
— 657-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 657-439 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F ANAHEIM CA
— 657-441 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
— 657-444 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E PLACENTIA CA
— 657-456 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ANAHEIM CA
— 657-464 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E HUNTITNBCH CA
— 657-465 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CYPRESS CA
— 657-500 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C FULLERTON CA
— 657-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 657-529 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BUENA PARK CA
— 657-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 657-600 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C SANTA ANA CA
— 657-606 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 GARDEN GRV CA
— 657-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 657-645 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J SANTA ANA CA
— 657-666 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C WESTMINSTR CA
— 657-700 not yet reported which blocks → CA
— 657-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 657-720 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SANTA ANA CA
— 657-722 0–9 XXXall 10 · 9 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E GARDEN GRV CA
— 657-777 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CYPRESS CA
— 657-800 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C GARDEN GRV CA
— 657-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 657-859 0–9 XXXall 10 · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SANTA ANA CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.