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 512
SOUTHWESTERN BELL 274
NEW CINGULAR WIRELESS PCS, LLC - IL 98
T-MOBILE USA, INC. 70
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 49
LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 45
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
2024-11-01 512-612 0–9 XXXall 10 · 3 holders which blocks → LEAP TELECOM, LLC 616J AUSTIN TX
2023-08-23 512-737 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
2023-08-15 512-979 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
2023-07-28 512-325 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C LEANDER TX
2023-05-16 512-254 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
2023-01-06 512-512 0–9 XXXall 10 · 2 holders which blocks → USFON, INC. - TX 473F AUSTIN TX
2022-07-28 512-500 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 AUSTIN TX
2022-05-24 512-702 0–9 XXXall 10 · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J AUSTIN TX
2022-05-24 512-880 0–9 XXXall 10 · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J BASTROP TX
2022-05-13 512-316 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GEORGETOWN TX
2022-05-04 512-881 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C LEANDER TX
2022-05-04 512-882 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C GEORGETOWN TX
2022-05-04 512-885 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C LOCKHART TX
2022-04-29 512-889 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H AUSTIN TX
2022-04-28 512-503 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C AUSTIN TX
2021-06-17 512-631 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C AUSTIN TX
2019-04-01 512-884 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J AUSTIN TX
2019-02-15 512-866 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F PAIGE TX
2019-02-14 512-886 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F BUCHANNDAM TX
2018-11-26 512-871 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 AUSTIN TX
2015-03-27 512-210 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SAN MARCOS TX
2015-03-10 512-713 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 GEORGETOWN TX
2015-02-17 512-409 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BASTROP TX
2015-01-05 512-817 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C LEANDER TX
2014-11-25 512-839 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
2014-11-25 512-975 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
2014-11-20 512-766 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F AUSTIN TX
2014-10-24 512-361 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BUDA TX
2014-10-21 512-806 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 AUSTIN TX
2014-10-21 512-915 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
2014-10-20 512-214 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SAN MARCOS TX
2014-10-16 512-580 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K AUSTIN TX
2014-10-06 512-710 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F AUSTIN TX
2014-09-18 512-783 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 AUSTIN TX
2014-09-15 512-790 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F BURNET TX
2014-09-10 512-645 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
2014-08-25 512-792 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 AUSTIN TX
2014-08-19 512-840 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J AUSTIN TX
2014-08-12 512-893 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2014-07-03 512-640 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 AUSTIN TX
2014-07-02 512-643 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F AUSTIN TX
2014-06-30 512-679 0–9 XXXwhole prefix which blocks → METROPCS, INC. 5562 AUSTIN TX
2014-06-18 512-572 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C BERTRAM TX
2014-05-27 512-399 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F THORNDTHRL TX
2014-05-27 512-648 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F WIMBERLEY TX
2014-04-17 512-675 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F BUCHANNDAM TX
2014-04-17 512-957 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F PAIGE TX
2014-04-11 512-967 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F KEMPNER TX
2014-02-28 512-960 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
2014-02-03 512-598 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K JARRELL TX

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.