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
2021-03-19 605-709 0–9 XXXall 10 · 3 holders which blocks → STRATUS NETWORKS 495J HARISBGTEA SD
2021-03-02 605-401 0–9 XXXall 10 · 5 holders which blocks → IP HORIZON LLC 515J SIOUX FLS SD
2021-01-15 605-736 0–9 XXXall 10 · 5 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 BROOKINGS SD
2020-11-18 605-409 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 HARISBGTEA SD
2020-11-12 605-657 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - SD 162G WATERTOWN SD
2020-10-29 605-989 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → NUSO, LLC 478J NOVALENTIN SD
2020-10-23 605-601 0–9 XXXall 10 · 5 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SIOUX FLS SD
2020-10-12 605-971 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 ABERDEEN SD
2020-08-03 605-318 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 PIERRE SD
2020-05-21 605-316 0–9 XXXall 10 · 5 holders which blocks → AIRUS, INC. - SD 580H IROQUOIS SD
2020-02-18 605-674 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - SD 162G BIGSTONECY SD
2020-01-21 605-303 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 WATERTOWN SD
2020-01-17 605-774 0–9 XXXall 10 · 4 holders which blocks → EDGETEL, LLC 179J SIOUX FLS SD
2019-12-23 605-608 0–9 XXXall 10 · 5 holders which blocks → HD CARRIER LLC 321J RAPID CITY SD
2019-12-09 605-607 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J SIOUX FLS SD
2019-11-19 605-501 0–9 XXXall 10 · 4 holders which blocks → WIDE VOICE, LLC - SD 071J SIOUX FLS SD
2019-10-29 605-981 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 RAPID CITY SD
2019-10-25 605-606 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H SIOUX FLS SD
2019-10-11 605-640 0–9 XXXall 10 · 5 holders which blocks → AIRUS, INC. - SD 580H MCINTOSH SD
2019-09-18 605-650 0–9 XXXall 10 · 4 holders which blocks → EXIANT COMMUNICATIONS LLC 114J SIOUX FLS SD
2019-08-26 605-525 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → VALLEY COMMUNICATIONS, INC. D/B/A VALLEY FIBERCOM 363J LK PRESTON SD
2019-06-19 605-705 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H SIOUX FLS SD
2019-06-11 605-975 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - SD 162G YANKTON SD
2019-05-29 605-403 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J SIOUX FLS SD
2019-05-07 605-315 0–9 XXXall 10 · 4 holders which blocks → AIRUS, INC. - SD 580H ARLINGTON SD
2019-05-07 605-815 0–9 XXXall 10 · 5 holders which blocks → AIRUS, INC. - SD 580H CHAMBERLAN SD
2019-04-25 605-307 0–9 XXXall 10 · 5 holders which blocks → AIRUS, INC. - SD 580H HILL CITY SD
2019-01-28 605-600 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H RAPID CITY SD
2019-01-28 605-667 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H HARISBGTEA SD
2019-01-25 605-900 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H SIOUX FLS SD
2018-12-11 605-800 0–9 XXXall 10 · 6 holders which blocks → TERRA NOVA TELECOM INC. 145J SIOUX FLS SD
2018-12-06 605-827 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → VALLEY COMMUNICATIONS, INC. D/B/A VALLEY FIBERCOM 363J VOLGA SD
2018-10-10 605-615 not yet reported which blocks → NATIVE AMERICAN TELECOM - PINE RIDGE LLC - SD 870F PINE RIDGE SD
2018-06-21 605-961 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D SIOUX FLS SD
2018-04-02 605-570 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 HURON SD
2018-01-11 605-313 0–9 XXXwhole prefix which blocks → NORTHERN VALLEY COMMUNICATIONS, LLC 6125 REDFIELD SD
2017-12-26 605-846 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 ABERDEEN SD
2017-11-14 605-970 5XXX6XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARTIN SD
2017-11-01 605-980 0XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARTIN SD
2017-08-02 605-410 0XXX5XXX · 2 holders which blocks → MIDCONTINENT COMMUNICATIONS. - SD 7076 IPSWICH SD
2017-05-25 605-250 0–9 XXXwhole prefix which blocks → ONVOY, LLC - SD 162G SIOUX FLS SD
2017-05-03 605-960 0XXX2XXX6XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 HURON SD
2017-04-07 605-804 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 CASTLEWOOD SD
2017-03-30 605-740 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SIOUX FLS SD
2017-03-23 605-404 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9631 SIOUX FLS SD
2017-03-03 605-417 0–9 XXXwhole prefix which blocks → NATIVE AMERICAN TELECOM, LLC - SD 424F FTTHOMPSON SD
2017-01-26 605-872 0–9 XXXall 10 · 5 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 RAPID CITY SD
2016-12-23 605-453 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 MILLER SD
2016-12-21 605-305 0–9 XXXall 10 · 8 holders which blocks → TELNYX LLC 073H SIOUX FLS SD
2016-12-09 605-560 0XXX1XXX · 2 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F BROOKINGSR 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.