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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2003-08-12 870-680 0XXX2XXX3XXX7XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 JONESBORO AR
2001-05-10 870-498 1XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CAMDEN AR
2001-05-08 870-394 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 W MEMPHIS AR
2001-05-08 870-525 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CHERRY VLY AR
— 870-208 0XXX2XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 WYNNE AR
— 870-215 7XXX9XXX which blocks → SOUTHWESTERN BELL 9533 PARAGOULD AR
— 870-217 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 NEWPORT AR
— 870-222 0XXX which blocks → SOUTHWESTERN BELL 9533 MCGEHEE AR
— 870-226 0XXX which blocks → SOUTHWESTERN BELL 9533 WARREN AR
— 870-230 0XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ARKADLPHIA AR
— 870-231 0XXX2XXX3XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CAMDEN AR
— 870-234 9XXX which blocks → SOUTHWESTERN BELL 9533 MAGNOLIA AR
— 870-235 1XXX8XXX which blocks → SOUTHWESTERN BELL 9533 MAGNOLIA AR
— 870-236 not yet reported which blocks → SOUTHWESTERN BELL 9533 PARAGOULD AR
— 870-238 0XXX which blocks → SOUTHWESTERN BELL 9533 WYNNE AR
— 870-239 not yet reported which blocks → SOUTHWESTERN BELL 9533 PARAGOULD AR
— 870-240 not yet reported which blocks → SOUTHWESTERN BELL 9533 PARAGOULD AR
— 870-245 not yet reported which blocks → SOUTHWESTERN BELL 9533 ARKADLPHIA AR
— 870-246 not yet reported which blocks → SOUTHWESTERN BELL 9533 ARKADLPHIA AR
— 870-247 8XXX which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-251 0XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BATESVILLE AR
— 870-252 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 GRUBBS AR
— 870-253 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 JONESBORO AR
— 870-261 9XXX which blocks → SOUTHWESTERN BELL 9533 FORREST CY AR
— 870-262 0XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BATESVILLE AR
— 870-264 0XXX2XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 OIL TROUGH AR
— 870-265 0XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LAKE VLG AR
— 870-267 0XXX2XXX3XXX4XXX5XXX8XXX which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-268 not yet reported which blocks → SOUTHWESTERN BELL 9533 JONESBORO AR
— 870-283 0XXX1XXX4XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 CAVE CITY AR
— 870-295 not yet reported which blocks → SOUTHWESTERN BELL 9533 MARIANNA AR
— 870-298 0XXX1XXX3XXX4XXX5XXX6XXX8XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 MARIANNA AR
— 870-307 none assigned yet which blocks → SOUTHWESTERN BELL 9533 BATESVILLE AR
— 870-309 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 EL DORADO AR
— 870-335 0XXX1XXX2XXX3XXX4XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 PARAGOULD AR
— 870-338 6XXX which blocks → SOUTHWESTERN BELL 9533 HELENA AR
— 870-339 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 HUGHES AR
— 870-343 0XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 TURRELL AR
— 870-353 0XXX3XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 GURDON AR
— 870-355 0XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 EUDORA AR
— 870-367 not yet reported which blocks → SOUTHWESTERN BELL 9533 MONTICELLO AR
— 870-400 1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 W MEMPHIS AR
— 870-403 4XXX5XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ARKADLPHIA AR
— 870-442 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 CHERRY VLY AR
— 870-451 0XXX5XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 NASHVILLE AR
— 870-460 5XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 MONTICELLO AR
— 870-464 0XXX1XXX2XXX3XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ARKADLPHIA AR
— 870-469 0XXX2XXX3XXX4XXX6XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 WILMAR AR
— 870-477 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 CASH AR
— 870-479 0XXX2XXX4XXX5XXX6XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 GRADY 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.