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
2013-03-22 913-309 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 KANSASCITY KS
2013-03-22 951-350 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F HEMT SNJC CA
2013-03-22 951-357 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F HEMT HEMT CA
2013-03-22 951-365 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F TEMECULA CA
2013-03-22 951-981 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LAKEVIEWNU CA
2013-03-21 276-296 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA 7299 INDEPNDNCE VA
2013-03-21 314-384 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G CREVECOEUR MO
2013-03-21 417-450 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G SPRINGFLD MO
2013-03-21 515-330 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY OF IOWA, LLC - IA 751F DES MOINES IA
2013-03-21 573-606 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NUSO, LLC 551G JEFFERSNCY MO
2013-03-21 816-859 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G KANSASCITY MO
2013-03-21 908-409 0–9 XXXall 10 · 8 holders which blocks → CSC VOICE, LLC 612K ELIZABETH NJ
2013-03-21 985-213 0–9 XXXall 10 · 3 holders which blocks → ADVANCED TEL., INC. - LA 8839 LAROSE LA
2013-03-20 210-740 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SANANTONIO TX
2013-03-20 432-234 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 TERMINAL TX
2013-03-20 469-601 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANDPRARI TX
2013-03-20 469-662 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANDPRARI TX
2013-03-20 469-919 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 MCKINNEY TX
2013-03-20 832-917 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 HOUSTON TX
2013-03-20 832-919 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 HOUSTON TX
2013-03-19 224-337 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FOX LAKE IL
2013-03-19 469-603 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DALLAS TX
2013-03-19 561-410 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 WPALMBEACH FL
2013-03-19 832-913 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 KATY TX
2013-03-18 305-901 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - FL 982E KEYS FL
2013-03-18 321-301 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 COCOA FL
2013-03-18 405-898 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 551G OKLA CITY OK
2013-03-18 607-399 0–9 XXXall 10 · 5 holders which blocks → SERVICE ELECTRIC TELEPHONE COMPANY, LLC - NY 932G HARPURSVL NY
2013-03-18 607-499 0XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → SERVICE ELECTRIC TELEPHONE COMPANY, LLC - NY 932G WINDSOR NY
2013-03-18 702-843 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G LAS VEGAS NV
2013-03-18 707-368 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F LEGGETT CA
2013-03-18 719-299 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F PUEBLO CO
2013-03-18 775-409 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G RENO NV
2013-03-18 909-990 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K RIALTO CA
2013-03-18 918-954 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 551G TULSA OK
2013-03-18 949-526 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 IRVINE CA
2013-03-18 949-556 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 IRVINE CA
2013-03-16 616-253 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C MOLINE MI
2013-03-15 202-770 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - DC 074F WSHNGTNZN1 DC
2013-03-15 289-918 not yet reported which blocks → Distributel 082E Oshawa —
2013-03-15 316-302 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G WICHITA KS
2013-03-15 334-547 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J DOTHAN AL
2013-03-15 469-435 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GRANDPRARI TX
2013-03-15 469-515 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GRANDPRARI TX
2013-03-15 469-516 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GRANDPRARI TX
2013-03-15 469-520 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GRANDPRARI TX
2013-03-15 469-540 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GRANDPRARI TX
2013-03-15 657-667 0–9 XXXall 10 · 7 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K GARDEN GRV CA
2013-03-15 705-449 not yet reported which blocks → Distributel 082E Sudbury —
2013-03-15 720-580 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO

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.