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 308
QWEST CORPORATION 42
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
2015-04-21 308-568 0–9 XXXall 10 · 3 holders which blocks → QWEST CORPORATION 9631 NO PLATTE NE
2002-03-26 308-255 not yet reported which blocks → QWEST CORPORATION 9631 SIDNEY NE
— 308-254 not yet reported which blocks → QWEST CORPORATION 9631 SIDNEY NE
— 308-262 3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → QWEST CORPORATION 9631 BRIDGEPORT NE
— 308-284 1XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9631 OGALLALA NE
— 308-324 not yet reported which blocks → QWEST CORPORATION 9631 LEXINGTON NE
— 308-336 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 FARWELL NE
— 308-337 1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9631 ATLANTA NE
— 308-345 0XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 MCCOOK NE
— 308-381 not yet reported which blocks → QWEST CORPORATION 9631 GRAND IS NE
— 308-382 not yet reported which blocks → QWEST CORPORATION 9631 GRAND IS NE
— 308-384 not yet reported which blocks → QWEST CORPORATION 9631 GRAND IS NE
— 308-385 8XXX which blocks → QWEST CORPORATION 9631 GRAND IS NE
— 308-389 1XXX which blocks → QWEST CORPORATION 9631 GRAND IS NE
— 308-395 2XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9631 GRAND IS NE
— 308-432 1XXX which blocks → QWEST CORPORATION 9631 CHADRON NE
— 308-445 not yet reported which blocks → QWEST CORPORATION 9636 NO JULESBG NE
— 308-485 1XXX2XXX3XXX6XXX7XXX · 4 holders which blocks → QWEST CORPORATION 9631 CAIRO NE
— 308-532 not yet reported which blocks → QWEST CORPORATION 9631 NO PLATTE NE
— 308-534 not yet reported which blocks → QWEST CORPORATION 9631 NO PLATTE NE
— 308-535 1XXX which blocks → QWEST CORPORATION 9631 NO PLATTE NE
— 308-536 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9631 FULLERTON NE
— 308-537 0XXX1XXX5XXX6XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 GOTHENBURG NE
— 308-583 1XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 WOOD RIVER NE
— 308-665 0XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 CRAWFORD NE
— 308-667 7XXX which blocks → QWEST CORPORATION 9631 CRAWFORD NE
— 308-668 1XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9631 HARRISON NE
— 308-687 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9631 ST LIBORY NE
— 308-743 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → QWEST CORPORATION 9631 AXTELL NE
— 308-745 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → QWEST CORPORATION 9631 LOUP CITY NE
— 308-754 0XXX1XXX2XXX3XXX6XXX · 5 holders which blocks → QWEST CORPORATION 9631 ST PAUL NE
— 308-762 not yet reported which blocks → QWEST CORPORATION 9631 ALLIANCE NE
— 308-763 1XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 ALLIANCE NE
— 308-773 1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 SILVER CRK NE
— 308-785 0XXX1XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9631 ELWOOD NE
— 308-824 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → QWEST CORPORATION 9631 OXFORD NE
— 308-832 4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 MINDEN NE
— 308-856 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → QWEST CORPORATION 9631 ELM CREEK NE
— 308-872 1XXX7XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 BROKEN BOW NE
— 308-889 2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9631 BIGSPRINGS NE
— 308-946 7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 CENTRAL CY NE
— 308-995 0XXX1XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9631 HOLDREGE NE

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.