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 CINGULAR WIRELESS PCS, LLC - IL 105
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 85
WINDSTREAM ARKANSAS, INC. 72
LEVEL 3 COMMUNICATIONS, LLC - AR 47
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
2001-09-18 870-738 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 JONESBORO AR
2001-09-13 870-872 5XXX6XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PINE BLUFF AR
2001-07-18 870-316 6XXX7XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JONESBORO AR
2001-06-20 870-416 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 HARRISON AR
2001-06-20 870-484 1XXX2XXX3XXX4XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 SHERIDAN AR
2001-06-20 870-726 4XXX6XXX · 2 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 GREEN FOR AR
2001-06-20 870-825 1XXX2XXX5XXX · 3 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 DIERKS AR
2001-05-10 870-224 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 MONTICELLO AR
2001-05-10 870-498 1XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CAMDEN AR
2001-05-10 870-626 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 MAGNOLIA AR
2001-05-08 870-210 2XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARKADLPHIA AR
2001-05-08 870-228 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 HELENA AR
2001-05-08 870-394 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 W MEMPHIS AR
2001-05-08 870-474 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 HOPE AR
2001-05-08 870-493 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → E. RITTER COMMUNICATIONS, LLC 128L DELL AR
2001-05-08 870-495 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 NEWPORT AR
2001-05-08 870-525 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CHERRY VLY AR
2001-05-08 870-527 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → E. RITTER COMMUNICATIONS, LLC 128L BRINKLEY AR
2001-05-08 870-565 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 PARAGOULD AR
2001-05-08 870-568 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 ARKADLPHIA AR
2001-05-08 870-569 0–9 XXXall 10 · 6 holders which blocks → E. RITTER COMMUNICATIONS, LLC 128L BATESVILLE AR
2001-05-08 870-594 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 FORREST CY AR
2001-05-08 870-614 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → E. RITTER COMMUNICATIONS, LLC 128L LUXORA AR
2001-05-08 870-637 0–9 XXXall 10 · 8 holders which blocks → E. RITTER COMMUNICATIONS, LLC 128L WALNUT RDG AR
2001-02-27 870-758 6XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POCAHONTAS AR
2001-02-20 870-468 2XXX4XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST ARKANSAS, LLC 1143 CLARENDON AR
2001-02-20 870-634 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 PIGGOTT AR
2001-01-23 870-562 2XXX7XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MAGNOLIA AR
— 870-203 0–9 XXXall 10 · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H JONESBORO AR
— 870-204 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J HARRISON AR
— 870-208 0XXX2XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 WYNNE AR
— 870-209 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 PINE BLUFF AR
— 870-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AR
— 870-212 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PARAGOULD AR
— 870-213 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT VIEW AR
— 870-214 3XXX4XXX7XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 MT VIEW AR
— 870-215 7XXX9XXX which blocks → SOUTHWESTERN BELL 9533 PARAGOULD AR
— 870-216 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 TEXARKANA AR
— 870-217 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 NEWPORT AR
— 870-218 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VONAGE AMERICA LLC 197D PINE BLUFF AR
— 870-219 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JONESBORO AR
— 870-222 0XXX which blocks → SOUTHWESTERN BELL 9533 MCGEHEE AR
— 870-223 not yet reported which blocks → WINDSTREAM ARKANSAS, INC. 1691 GLENWOOD AR
— 870-225 0XXX2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 W MEMPHIS 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

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.