NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 — NPA 737
8X8, INC. 1
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
2022-06-28 737-326 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2022-06-28 737-328 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2022-05-27 737-323 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 LEANDER TX
2022-05-27 737-324 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LEANDER TX
2022-03-01 737-321 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ELGIN TX
2022-02-28 737-320 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J AUSTIN TX
2022-02-04 737-319 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 AUSTIN TX
2022-02-02 737-318 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BASTROP TX
2022-01-27 737-315 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SAN MARCOS TX
2022-01-26 737-314 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GEORGETOWN TX
2022-01-26 737-378 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J KYLE TX
2022-01-13 737-746 0XXX1XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BERTRAM TX
2021-12-30 737-587 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H AUSTIN TX
2021-12-29 737-313 0–9 XXXall 10 · 6 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J AUSTIN TX
2021-11-04 737-310 0–9 XXXall 10 · 7 holders which blocks → HD CARRIER LLC 321J WIMBERLEY TX
2021-11-03 737-420 0–9 XXXall 10 · 2 holders which blocks → COMMIO, LLC 939H AUSTIN TX
2021-11-02 737-312 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C KYLE TX
2021-11-01 737-309 0–9 XXXall 10 · 3 holders which blocks → CALLWORKS CORPORATION 475J AUSTIN TX
2021-10-26 737-386 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H LAMPASAS TX
2021-10-22 737-308 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
2021-10-18 737-306 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HUTTO TX
2021-10-05 737-305 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BUDA TX
2021-09-14 737-301 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F AUSTIN TX
2021-09-09 737-298 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 LEANDER TX
2021-09-07 737-303 0–9 XXXall 10 · 5 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J SAN MARCOS TX
2021-09-07 737-707 0–9 XXXall 10 · 7 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J AUSTIN TX
2021-09-03 737-678 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J DRIPPNGSPG TX
2021-09-03 737-762 0–9 XXXall 10 · 9 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SMITHVILLE TX
2021-08-25 737-297 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2021-08-24 737-295 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
2021-08-24 737-296 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2021-08-20 737-293 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BASTROP TX
2021-08-20 737-294 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BASTROP TX
2021-08-17 737-291 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
2021-07-29 737-290 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F GEORGETOWN TX
2021-06-23 737-292 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
2021-06-18 737-289 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 AUSTIN TX
2021-05-28 737-357 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H LOCKHART TX
2021-05-28 737-375 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H ROCKDALE TX
2021-05-10 737-288 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H AUSTIN TX
2021-05-10 737-688 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H COUPLAND TX
2021-04-29 737-287 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LEANDER TX
2021-04-29 737-742 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J AUSTIN TX
2021-04-14 737-286 0–9 XXXall 10 · 4 holders which blocks → COMMIO, LLC 939H KYLE TX
2021-04-14 737-788 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H BURNET TX
2021-04-08 737-828 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J KEMPNER TX
2021-03-02 737-799 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H GRANGER TX
2021-03-02 737-864 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J TAYLOR TX
2021-02-24 737-767 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J LAMPASAS TX
2021-02-02 737-738 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C GEORGETOWN TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.