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
2021-11-01 445-219 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 PHPHSBZN39 PA
2021-11-01 448-201 0–9 XXXwhole prefix which blocks → POWERTEL JACKSONVILLE LICENSES, INC. 7472 BONIFAY FL
2021-11-01 559-607 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E DINUBA CA
2021-11-01 659-245 0XXX1XXX2XXX3XXX4XXX9XXX · 3 holders which blocks → COMMIO, LLC 939H VERNON AL
2021-11-01 667-358 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 EASTON MD
2021-11-01 708-773 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H CHICAGOHTS IL
2021-11-01 737-309 0–9 XXXall 10 · 3 holders which blocks → CALLWORKS CORPORATION 475J AUSTIN TX
2021-11-01 742-889 not yet reported which blocks → ISP Telecom Inc. 4727 Wainfleet —
2021-11-01 742-890 not yet reported which blocks → ISP Telecom Inc. 4727 Wellandport —
2021-11-01 865-422 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 KNOXVILLE TN
2021-11-01 934-221 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 SMITHTOWN NY
2021-11-01 945-229 0–9 XXXall 10 · 6 holders which blocks → CALLWORKS CORPORATION 475J DALLAS TX
2021-11-01 947-238 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTHFIELD MI
2021-10-29 231-396 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C CADILLAC MI
2021-10-29 346-519 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F CHANNELVW TX
2021-10-29 442-370 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 INDIO CA
2021-10-29 586-326 0XXX3XXX4XXX6XXX7XXX · 2 holders which blocks → ONVOY, LLCV - MI 543C RICHMOND MI
2021-10-29 615-623 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F GALLATIN TN
2021-10-29 615-639 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F DICKSON TN
2021-10-29 615-652 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F PORTLAND TN
2021-10-29 616-342 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C HUDSONVL MI
2021-10-29 618-807 0XXX9XXX · 2 holders which blocks → COMMIO, LLC 939H ALHAMBRA IL
2021-10-29 618-809 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MT VERNON IL
2021-10-29 618-866 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H BELLEVILLE IL
2021-10-29 618-955 5XXX9XXX · 2 holders which blocks → FRACTEL, LLC 965H ADDIEVILLE IL
2021-10-29 619-943 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2021-10-29 629-269 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F HENDERSNVL TN
2021-10-29 769-271 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 NATCHEZ MS
2021-10-29 769-272 0–9 XXXall 10 · 3 holders which blocks → POWERTEL MEMPHIS LICENSES, INC. 7474 VICKSBURG MS
2021-10-29 862-389 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 NEWTON NJ
2021-10-28 213-492 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2021-10-28 213-574 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 07 CA
2021-10-28 254-483 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C TEMPLE TX
2021-10-28 307-291 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H CODY WY
2021-10-28 341-204 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E FRNK GRNLF CA
2021-10-28 341-420 0–9 XXXall 10 · 5 holders which blocks → SONIC TELECOM, LLC - CA 433E OKLD FRTVL CA
2021-10-28 346-518 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F PINEHURST TX
2021-10-28 346-522 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C HUMBLE TX
2021-10-28 424-454 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CMTN CMTN CA
2021-10-28 424-460 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CULVERCITY CA
2021-10-28 425-370 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2021-10-28 442-364 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2021-10-28 520-242 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 WILLCOX AZ
2021-10-28 520-451 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-10-28 559-378 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E TULARE CA
2021-10-28 559-576 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E PORTERVL CA
2021-10-28 640-214 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NJ 118F EWING NJ
2021-10-28 661-531 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ARVIN CA
2021-10-28 701-504 0–9 XXXall 10 · 6 holders which blocks → COMMIO, LLC 939H DICKINSON ND
2021-10-28 708-630 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E BERWYN IL

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.