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 479
SOUTHWESTERN BELL 88
SOUTHWESTERN BELL TELEPHONE COMPANY - AR 5
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
2017-01-19 479-367 0–9 XXXall 10 · 5 holders which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
2015-09-18 479-401 0–9 XXXall 10 · 5 holders which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
2014-04-25 479-320 0–9 XXXall 10 · 6 holders which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
2010-01-27 479-261 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
2007-06-27 479-338 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL 9533 ROGERS AR
2006-02-06 479-333 0–9 XXXall 10 · 5 holders which blocks → SOUTHWESTERN BELL TELEPHONE COMPANY - AR 8870 ELMSPRINGS AR
2006-02-06 479-844 0–9 XXXall 10 · 7 holders which blocks → SOUTHWESTERN BELL TELEPHONE COMPANY - AR 8870 ELMSPRINGS AR
2004-10-11 479-258 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
2003-12-22 479-224 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL TELEPHONE COMPANY - AR 8870 CENTERTON AR
2002-05-13 479-553 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
2001-07-19 479-463 0XXX9XXX which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
2001-04-25 479-314 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
2001-03-01 479-573 3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-201 0XXX which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-203 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL TELEPHONE COMPANY - AR 8870 ELMSPRINGS AR
— 479-204 not yet reported which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
— 479-205 not yet reported which blocks → SOUTHWESTERN BELL TELEPHONE COMPANY - AR 8870 ELMSPRINGS AR
— 479-226 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-243 9XXX which blocks → SOUTHWESTERN BELL 9533 MENA AR
— 479-246 8XXX which blocks → SOUTHWESTERN BELL 9533 ROGERS AR
— 479-251 0XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-253 not yet reported which blocks → SOUTHWESTERN BELL 9533 EUREKA SPG AR
— 479-254 not yet reported which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
— 479-271 not yet reported which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
— 479-273 not yet reported which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
— 479-277 not yet reported which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
— 479-288 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-290 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-306 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-361 0XXX3XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-363 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 EUREKA SPG AR
— 479-394 9XXX which blocks → SOUTHWESTERN BELL 9533 MENA AR
— 479-410 0XXX3XXX4XXX7XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 VAN BUREN AR
— 479-418 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
— 479-419 0XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SPRINGDALE AR
— 479-437 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 MENA AR
— 479-441 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-442 not yet reported which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-443 not yet reported which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-444 not yet reported which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-445 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-452 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-464 not yet reported which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
— 479-471 not yet reported which blocks → SOUTHWESTERN BELL 9533 VAN BUREN AR
— 479-474 not yet reported which blocks → SOUTHWESTERN BELL 9533 VAN BUREN AR
— 479-478 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-484 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-494 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT SMITH AR
— 479-521 not yet reported which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL AR
— 479-527 0XXX which blocks → SOUTHWESTERN BELL 9533 FAYETTEVL 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.