NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

358 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 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
2013-02-12 431-229 not yet reported which blocks → MTS Inc. 991B The Pas —
2013-02-12 431-230 not yet reported which blocks → MTS Inc. 991B Cross Lake —
2013-02-12 440-910 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 HILLCREST OH
2013-02-12 609-832 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MOUNTHOLLY NJ
2013-02-12 865-320 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 551G KNOXVILLE TN
2013-02-12 901-440 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G MEMPHIS TN
2013-02-11 239-228 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - FL 4802 NAPLES FL
2013-02-11 269-218 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E GALESBURG MI
2013-02-11 276-832 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F JONESVILLE VA
2013-02-11 323-538 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 06 CA
2013-02-11 331-302 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2013-02-11 385-214 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2013-02-11 424-293 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 W ANGELES CA
2013-02-11 440-620 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 HILLCREST OH
2013-02-11 657-221 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ORANGE CA
2013-02-11 802-495 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BURLINGTON VT
2013-02-11 804-294 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - VA 079F KNGANDQUEN VA
2013-02-11 859-337 0XXX1XXX7XXX · 3 holders which blocks → NUSO, LLC 551G WINCHESTER KY
2013-02-11 872-240 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2013-02-11 903-417 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEW BOSTON TX
2013-02-11 909-361 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 S BERNDINO CA
2013-02-11 978-770 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J LOWELL MA
2013-02-08 204-506 not yet reported which blocks → TELUS Integrated Communications 2782 Oakbank —
2013-02-08 204-516 not yet reported which blocks → TELUS Integrated Communications 2782 Macgregor —
2013-02-08 207-360 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - ME 7777 WELLS ME
2013-02-08 210-802 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SANANTONIO TX
2013-02-08 225-424 0–9 XXXall 10 · 4 holders which blocks → TELEPAK NETWORKS, INC. - LA 908A BATONROUGE LA
2013-02-08 276-754 0XXX1XXX4XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K CANA VA
2013-02-08 289-719 not yet reported which blocks → Comwave Networks 160G Streetsville —
2013-02-08 289-729 not yet reported which blocks → Comwave Networks 160G Malton —
2013-02-08 289-749 not yet reported which blocks → Comwave Networks 160G Castlemore —
2013-02-08 360-964 0–9 XXXall 10 · 5 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 MONTESANO WA
2013-02-08 438-374 not yet reported which blocks → Videotron Ltd. 8306 Montreal —
2013-02-08 475-243 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F ANSONIDRBY CT
2013-02-08 475-444 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F NEWTOWN CT
2013-02-08 475-999 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF CONNECTICUT, LLC - CT 539F FAIRFIELD CT
2013-02-08 480-400 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F PHOENIX AZ
2013-02-08 502-912 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G LOUISVILLE KY
2013-02-08 575-468 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NM 7464 PORTALES NM
2013-02-08 581-985 not yet reported which blocks → Videotron Ltd. 328F Quebec —
2013-02-08 618-603 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 BENTON IL
2013-02-08 702-907 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - NV 075F LAS VEGAS NV
2013-02-08 727-666 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF FLORIDA, LLC - FL 902E CLEARWATER FL
2013-02-08 816-302 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 KANSASCITY MO
2013-02-08 917-933 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN07 NY
2013-02-07 205-732 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 551G BIRMINGHAM AL
2013-02-07 312-724 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2013-02-07 334-781 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G MONTGOMERY AL
2013-02-07 727-800 0–9 XXXall 10 · 5 holders which blocks → TERRA NOVA TELECOM, INC. - FL 382G STPETERSBG FL
2013-02-07 774-777 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MA 892D FRAMINGHAM MA

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.