NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

337 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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 25
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 12
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
2013-03-11 513-215 0–9 XXXwhole prefix which blocks → CINCINNATI BELL 9348 CINCINNATI OH
2013-03-11 667-253 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NUSO, LLC 551G SALISBURY MD
2013-03-11 667-303 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 551G BALTIMORE MD
2013-03-11 815-329 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C ROCKFORD IL
2013-03-11 913-203 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 ATCHISON KS
2013-03-11 937-818 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2013-03-11 940-616 not yet reported which blocks → CHOICE WIRELESS, LC 3533 BELLEVUE TX
2013-03-11 940-619 not yet reported which blocks → CHOICE WIRELESS, LC 3533 IOWA PARK TX
2013-03-10 626-671 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 COVINA CA
2013-03-09 415-761 0–9 XXXall 10 · 8 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F NOVATO CA
2013-03-09 661-481 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNCA NHCS CA
2013-03-08 208-967 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → NUSO, LLC 551G COERDALENE ID
2013-03-08 226-757 not yet reported which blocks → Bell Mobility 6574 Windsor —
2013-03-08 270-421 0–9 XXXall 10 · 2 holders which blocks → POWERTEL KENTUCKY LICENSES, INC. 365C BOWLNGGREN KY
2013-03-08 334-631 1XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K SHAWMUT AL
2013-03-08 408-442 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F LOS GATOS CA
2013-03-08 408-809 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNJS SOUTH CA
2013-03-08 408-819 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CAMPBELL CA
2013-03-08 408-909 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SAN MARTIN CA
2013-03-08 414-204 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G MILWAUKZN1 WI
2013-03-08 431-281 not yet reported which blocks → MTS Inc. 991B Swan River —
2013-03-08 431-641 not yet reported which blocks → MTS Inc. 991B Gimli —
2013-03-08 434-439 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J LYNCHBURG VA
2013-03-08 437-222 not yet reported which blocks → Beanfield Technologies Inc. 575G Toronto —
2013-03-08 437-266 not yet reported which blocks → Comwave Networks 160G Toronto —
2013-03-08 438-222 not yet reported which blocks → Beanfield Technologies Inc. 575G Montreal —
2013-03-08 470-375 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J ATLANTA NE GA
2013-03-08 516-387 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E NASSAUZN01 NY
2013-03-08 517-295 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E HOWELL MI
2013-03-08 530-358 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F NOSAN JUAN CA
2013-03-08 530-491 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MARYSVILLE CA
2013-03-08 530-497 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F PLVL WEST CA
2013-03-08 540-393 0XXX1XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J ROCKYMOUNT VA
2013-03-08 540-795 0–9 XXXall 10 · 8 holders which blocks → NUSO, LLC 551G ROANOKE VA
2013-03-08 540-881 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 551G CULPEPER VA
2013-03-08 587-439 not yet reported which blocks → Bell Mobility 6574 Calgary —
2013-03-08 605-681 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G SIOUX FLS SD
2013-03-08 608-421 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G MADISON WI
2013-03-08 616-303 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E GREENVILLE MI
2013-03-08 707-298 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F EUREKA CA
2013-03-08 707-329 0–9 XXXall 10 · 8 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SEBASTOPOL CA
2013-03-08 707-390 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F PEPPERWOOD CA
2013-03-08 707-492 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F NAPA CA
2013-03-08 707-617 0–9 XXXall 10 · 9 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FORTUNA CA
2013-03-08 707-625 0–9 XXXall 10 · 8 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FORESTVL CA
2013-03-08 707-663 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F TMCV TMCV CA
2013-03-08 714-332 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BREA CA
2013-03-08 715-714 1XXX2XXX4XXX5XXX7XXX · 2 holders which blocks → NUSO, LLC 551G EAU CLAIRE WI
2013-03-08 747-220 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F AGOURA CA
2013-03-08 747-223 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BRBN SNVY CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.