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 870
SOUTHWESTERN BELL 154
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
— 870-494 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 FORREST CY AR
— 870-502 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-512 0XXX5XXX6XXX which blocks → SOUTHWESTERN BELL 9533 NEWPORT AR
— 870-523 not yet reported which blocks → SOUTHWESTERN BELL 9533 NEWPORT AR
— 870-532 0XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 BLYTHEVL AR
— 870-533 0XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 STAMPS AR
— 870-534 not yet reported which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-535 not yet reported which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-536 not yet reported which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-537 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 JOINER AR
— 870-538 0XXX6XXX7XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 DERMOTT AR
— 870-540 5XXX which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-541 not yet reported which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-543 none assigned yet which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-546 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 NORPHLET AR
— 870-554 0XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 MOUNTHOLLY AR
— 870-563 0XXX which blocks → SOUTHWESTERN BELL 9533 OSCEOLA AR
— 870-564 0XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 DELL AR
— 870-572 0XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 HELENA AR
— 870-573 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 PARAGOULD AR
— 870-574 none assigned yet which blocks → SOUTHWESTERN BELL 9533 CAMDEN AR
— 870-575 2XXX3XXX which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-578 0XXX3XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 HARRISBURG AR
— 870-581 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 FORREST CY AR
— 870-586 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 PARAGOULD AR
— 870-588 8XXX which blocks → SOUTHWESTERN BELL 9533 CHERRY VLY AR
— 870-589 5XXX which blocks → SOUTHWESTERN BELL 9533 BRINKLEY AR
— 870-596 0XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 VILLAGE AR
— 870-612 5XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BATESVILLE AR
— 870-622 not yet reported which blocks → SOUTHWESTERN BELL 9533 OSCEOLA AR
— 870-630 8XXX which blocks → SOUTHWESTERN BELL 9533 FORREST CY AR
— 870-633 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORREST CY AR
— 870-644 2XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 WATSON AR
— 870-655 0XXX2XXX3XXX4XXX6XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 WILSON AR
— 870-657 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 BLACKFIHLK AR
— 870-658 5XXX6XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 LUXORA AR
— 870-668 2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 CONCORD AR
— 870-685 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 CHIDESTER AR
— 870-695 0XXX2XXX4XXX5XXX6XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 MCNEIL AR
— 870-696 0XXX2XXX5XXX6XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 MACEDONIA AR
— 870-697 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 HICKORYRDG AR
— 870-698 8XXX which blocks → SOUTHWESTERN BELL 9533 BATESVILLE AR
— 870-702 0XXX4XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 W MEMPHIS AR
— 870-722 0XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 HOPE AR
— 870-725 5XXX6XXX7XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SMACKOVER AR
— 870-730 3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-732 not yet reported which blocks → SOUTHWESTERN BELL 9533 W MEMPHIS AR
— 870-733 not yet reported which blocks → SOUTHWESTERN BELL 9533 W MEMPHIS AR
— 870-734 2XXX which blocks → SOUTHWESTERN BELL 9533 BRINKLEY AR
— 870-735 not yet reported which blocks → SOUTHWESTERN BELL 9533 W MEMPHIS AR

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.