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
2021-11-15 539-264 0XXX1XXX2XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F KIEFER OK
2021-11-15 559-617 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E KINGSBURG CA
2021-11-15 559-680 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 FRESNO CA
2021-11-15 559-714 0XXX7XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E ORANGECOVE CA
2021-11-15 562-609 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
2021-11-15 579-510 not yet reported which blocks → IXICA Communications Inc. 812H St-Cesaire —
2021-11-15 579-707 not yet reported which blocks → IXICA Communications Inc. 812H Frelighsburg —
2021-11-15 579-710 not yet reported which blocks → IXICA Communications Inc. 812H Knowlton —
2021-11-15 579-744 not yet reported which blocks → IXICA Communications Inc. 812H Eastman —
2021-11-15 579-750 not yet reported which blocks → IXICA Communications Inc. 812H Bromont —
2021-11-15 579-755 not yet reported which blocks → IXICA Communications Inc. 812H Dunham —
2021-11-15 579-770 not yet reported which blocks → IXICA Communications Inc. 812H Cowansville —
2021-11-15 579-777 not yet reported which blocks → IXICA Communications Inc. 812H Granby —
2021-11-15 579-780 not yet reported which blocks → IXICA Communications Inc. 812H Mansonville —
2021-11-15 615-703 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F KINGSTNSPG TN
2021-11-15 626-597 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALHAMBRA CA
2021-11-15 650-643 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PALO ALTO CA
2021-11-15 657-541 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2021-11-15 657-739 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ANAHEIM CA
2021-11-15 661-936 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 PLDL PLDL CA
2021-11-15 669-319 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SNJS WEST CA
2021-11-15 712-499 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H SIOUX CITY IA
2021-11-15 716-561 0XXX1XXX5XXX6XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E SPRINGVL NY
2021-11-15 754-274 0–9 XXXwhole prefix which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 FTLAUDERDL FL
2021-11-15 754-275 0–9 XXXwhole prefix which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 HOLLYWOOD FL
2021-11-15 806-904 9XXX which blocks → ONVOY SPECTRUM, LLC 624H BROWNFIELD TX
2021-11-15 840-212 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHINO CA
2021-11-15 863-316 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - FL 8300 LAKELAND FL
2021-11-15 901-656 0–9 XXXall 10 · 4 holders which blocks → POWERTEL MEMPHIS LICENSES, INC. 7474 COLLIERVL TN
2021-11-15 931-907 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H COOKEVILLE TN
2021-11-12 223-901 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H EPHRATA PA
2021-11-12 229-523 0XXX2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H BLAKELY GA
2021-11-12 229-534 0XXX1XXX2XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H BUENAVISTA GA
2021-11-12 229-562 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H MCRAE GA
2021-11-12 325-314 0XXX1XXX6XXX7XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H ANSON TX
2021-11-12 325-316 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H COLORADOCY TX
2021-11-12 417-580 0XXX1XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E CARL JCT MO
2021-11-12 435-306 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EUREKA UT
2021-11-12 435-318 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 IBAPAH UT
2021-11-12 435-323 3XXX7XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PARKVALLEY UT
2021-11-12 478-389 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - GA 983E COCHRAN GA
2021-11-12 480-817 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H PHOENIX AZ
2021-11-12 530-819 0XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E COLFAX CA
2021-11-12 548-440 not yet reported which blocks → IXICA Communications Inc. 812H Kitchener-Waterloo —
2021-11-12 548-470 not yet reported which blocks → IXICA Communications Inc. 812H Hespeler —
2021-11-12 548-520 not yet reported which blocks → IXICA Communications Inc. 812H New Hamburg —
2021-11-12 548-530 not yet reported which blocks → IXICA Communications Inc. 812H Preston —
2021-11-12 548-590 not yet reported which blocks → IXICA Communications Inc. 812H Wellesley —
2021-11-12 579-520 not yet reported which blocks → IXICA Communications Inc. 812H St-Paul-D'Abbotsford —
2021-11-12 579-560 not yet reported which blocks → IXICA Communications Inc. 812H Sutton —

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.