NumberResearch Membership · Data 09/24/2026

Recent prefix assignments

349 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/24/2026

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 31
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
ONVOY, LLC - NJ 15
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
2012-09-10 581-586 not yet reported which blocks → Telecommunications Xittel Inc 247F Peribonka —
2012-09-10 581-587 not yet reported which blocks → Telecommunications Xittel Inc 247F Parc-des-Laurentides —
2012-09-10 581-588 not yet reported which blocks → Telecommunications Xittel Inc 247F Normandin —
2012-09-10 612-999 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TWINCITIES MN
2012-09-10 651-444 0–9 XXXall 10 · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 4139 TWINCITIES MN
2012-09-10 701-935 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - ND 452F EMERADO ND
2012-09-10 720-498 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2012-09-10 763-333 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 CAMBRIDGE MN
2012-09-10 763-999 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J TWINCITIES MN
2012-09-10 907-371 0–9 XXXall 10 · 2 holders which blocks → GCI COMMUNICATION CORP. DBA GENERAL COMMUNICATION 7785 FAIRBANKS AK
2012-09-10 916-542 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E FOLSOM CA
2012-09-10 952-999 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 TWINCITIES MN
2012-09-09 734-249 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
2012-09-07 414-316 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MILWAUKZN1 WI
2012-09-07 431-225 not yet reported which blocks → MTS Inc. 991B Holland —
2012-09-07 520-355 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-09-07 579-491 not yet reported which blocks → TELUS Mobility 8303 Valleyfield —
2012-09-07 602-428 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2012-09-07 873-377 not yet reported which blocks → TELUS Mobility 8303 Drummondville —
2012-09-07 916-292 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FOLSOM CA
2012-09-06 224-231 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 ROSELLE IL
2012-09-06 224-601 0–9 XXXall 10 · 8 holders which blocks → ILLINOIS BELL TEL CO 9329 SKOKIE IL
2012-09-06 401-430 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - RI 6389 PROVIDENCE RI
2012-09-06 401-602 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - RI 6389 PROVIDENCE RI
2012-09-06 405-693 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
2012-09-06 469-401 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANDPRARI TX
2012-09-06 512-910 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 AUSTIN TX
2012-09-06 581-989 not yet reported which blocks → TELUS Mobility 8303 Quebec —
2012-09-06 587-284 not yet reported which blocks → TELUS Mobility 8301 Calgary —
2012-09-06 587-982 not yet reported which blocks → TELUS Mobility 8301 Edmonton —
2012-09-06 603-307 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NO CONWAY NH
2012-09-06 603-402 0–9 XXXall 10 · 4 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 NASHUA NH
2012-09-06 612-401 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TWINCITIES MN
2012-09-06 631-230 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E MONTAUK PT NY
2012-09-06 631-248 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E E HAMPTON NY
2012-09-06 631-359 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E WADING RIV NY
2012-09-06 631-429 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E LINDENHST NY
2012-09-06 631-535 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E PTJEFFERSN NY
2012-09-06 647-575 not yet reported which blocks → Videotron Ltd. 787G Toronto —
2012-09-06 832-609 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 HOUSTON TX
2012-09-06 832-719 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 HSTNSUBURB TX
2012-09-06 832-801 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 HOUSTON TX
2012-09-05 210-419 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SANANTONIO TX
2012-09-05 224-301 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2012-09-05 484-216 0–9 XXXwhole prefix which blocks → PAETEC ITEL, LLC 829J PHPHSBZN28 PA
2012-09-05 570-999 3XXX6XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J FORESTCITY PA
2012-09-05 581-882 not yet reported which blocks → TELUS Mobility 8303 Chicoutimi —
2012-09-05 832-530 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOUSTON TX
2012-09-05 850-330 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL 9417 CHIPLEY FL
2012-09-05 873-378 not yet reported which blocks → TELUS Mobility 8303 Shawinigan —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.