NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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, all time — NPA 605
QWEST CORPORATION 104
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 100
NEW CINGULAR WIRELESS PCS, LLC - IL 81
MIDCONTINENT COMMUNICATIONS. - SD 34
CLARITY TELECOM, LLC DBA BLUEPEAK 33
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
2026-08-04 605-617 7XXX8XXX9XXX which blocks → AERIAL COMMUNICATIONS, INC. 6701 HILL CITY SD
2026-06-16 605-614 9XXX which blocks → AT&T - LOCAL 7421 ARLINGTON SD
2026-05-08 605-603 0XXX1XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - SD 106F RAPID CITY SD
2026-04-23 605-790 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SIOUX FLS SD
2025-11-12 605-508 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 RAPID CITY SD
2025-08-28 605-602 0XXX1XXX9XXX · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 WATERTOWN SD
2025-08-08 605-476 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → WAVENATION, LLC 700J SIOUX FLS SD
2025-08-07 605-320 0XXX1XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BROOKINGS SD
2025-04-01 605-701 0XXX9XXX · 2 holders which blocks → RINGER MOBILE, INC. 781K FLANDREAU SD
2025-03-14 605-713 1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 ABERDEEN SD
2025-03-03 605-974 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 RAPID CITY SD
2025-02-17 605-317 0XXX1XXX2XXX3XXX4XXX9XXX · 3 holders which blocks → ONVOY, LLC - SD 162G MITCHELL SD
2023-04-13 605-518 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SIOUX FLS SD
2023-04-03 605-820 0XXX which blocks → COMMIO, LLC 939H HURON SD
2023-03-14 605-514 0–9 XXXall 10 · 4 holders which blocks → NATIVE WIRELESS, LLC 078J HURON SD
2023-03-01 605-621 0–9 XXXall 10 · 6 holders which blocks → INTERSTATE TELECOMMUNICATIONS COOPERATIVE, INC. 907D MADISON SD
2023-02-10 605-513 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J RAPID CITY SD
2023-01-30 605-512 8XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J NEWUNDERWD SD
2022-11-23 605-905 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - SD 162G STURGIS SD
2022-09-30 605-605 0–9 XXXwhole prefix which blocks → ONVOY, LLC - SD 162G ABERDEEN SD
2022-08-02 605-506 9XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J WORTHING SD
2022-07-21 605-902 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - SD 106F WATERTOWN SD
2022-06-23 605-531 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 FLANDREAU SD
2022-06-13 605-308 0XXX5XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 NOSIOUX CY SD
2022-05-20 605-581 0XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MOBRIDGE SD
2022-03-10 605-909 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J HILL CITY SD
2022-02-24 605-992 2XXX7XXX8XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BIGSTONECY SD
2022-02-08 605-982 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ABERDEEN SD
2022-01-14 605-898 0XXX1XXX2XXX3XXX4XXX8XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J IROQUOIS SD
2022-01-13 605-634 0XXX1XXX2XXX3XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CAVOUR SD
2022-01-13 605-752 9XXX which blocks → TON80 COMMUNICATIONS, LLC 516J FTTHOMPSON SD
2022-01-10 605-746 7XXX which blocks → TON80 COMMUNICATIONS, LLC 516J PLATTE SD
2021-12-30 605-503 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J RAPID CITY SD
2021-12-08 605-604 0XXX which blocks → MIDCO VOICE, LLC 858J BRANDON SD
2021-10-13 605-510 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RAPID CITY SD
2021-10-07 605-502 0XXX1XXX2XXX3XXX · 3 holders which blocks → TELNYX LLC 073H PIERRE SD
2021-09-24 605-805 2XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 PIERRE SD
2021-08-17 605-801 0XXX1XXX2XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 BELLEFORCH SD
2021-07-29 605-998 0XXX1XXX2XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - SD 162G MILLER SD
2021-07-16 605-808 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - SD 162G REDFIELD SD
2021-06-23 605-522 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 YANKTON SD
2021-06-23 605-616 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H CANTON SD
2021-06-11 605-416 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 RAPID CITY SD
2021-06-11 605-812 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SIOUX FLS SD
2021-06-10 605-405 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - SD 162G ARLINGTON SD
2021-04-27 605-972 1XXX2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - SD 162G WESTJASPER SD
2021-04-16 605-910 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - SD 162G SIOUX FLS SD
2021-04-15 605-418 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 ABERDEEN SD
2021-03-31 605-663 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → AIRUS, INC. - SD 580H HURON SD
2021-03-31 605-991 0XXX1XXX2XXX3XXX4XXX · 5 holders which blocks → AIRUS, INC. - SD 580H MILBANK SD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.