NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

355 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
8X8, INC. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
— 915-598 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-599 7XXX which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-610 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX TX
— 915-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 915-612 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-615 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7148 EL PASO TX
— 915-621 1XXX2XXX3XXX5XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-626 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-629 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-630 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-633 2XXX3XXX4XXX5XXX which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-637 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 EL PASO TX
— 915-663 not yet reported which blocks → SPOK, INC. 6630 EL PASO TX
— 915-678 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-679 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-680 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-700 not yet reported which blocks → TX
— 915-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 915-724 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-726 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-727 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-730 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-731 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-740 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-744 not yet reported which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7263 EL PASO TX
— 915-745 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-747 none assigned yet which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-751 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-755 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-757 5XXX which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-759 1XXX2XXX4XXX5XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-760 0XXX1XXX3XXX7XXX9XXX which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-764 8XXX9XXX which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 FABENS TX
— 915-765 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 FABENS TX
— 915-769 6XXX which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 FT HANCOCK TX
— 915-771 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-772 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-774 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-775 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-778 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-779 9XXX which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-780 3XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-781 3XXX4XXX5XXX6XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-782 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-783 7XXX which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-790 3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-791 0XXX2XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
— 915-792 0XXX1XXX2XXX6XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7263 VINTON TX
— 915-799 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
— 915-808 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 EL PASO 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.