NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 715
NEW CINGULAR WIRELESS PCS, LLC - IL 100
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 99
FRONTIER NORTH INC. - WI 55
WISCONSIN BELL INC 41
CHARTER IP ENABLED SERVICES, LLC 36
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
2001-12-05 715-557 3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 STCROIXFLS WI
2001-12-05 715-558 7XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 HAYWARD WI
2001-12-05 715-641 3XXX4XXX6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 TURTLELAKE WI
2001-12-05 715-642 4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 CHETEK WI
2001-12-05 715-645 7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 SHELL LAKE WI
2001-12-05 715-773 3XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 THORP WI
2001-11-27 715-533 6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 OSSEO WI
2001-10-23 715-271 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EAU CLAIRE WI
2001-10-12 715-771 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 RHINELANDR WI
2001-09-14 715-309 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 MENOMONIE WI
2001-08-23 715-302 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WAUSAU WI
2001-08-21 715-210 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 EAU CLAIRE WI
2001-08-02 715-304 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 SHAWANO WI
2001-08-02 715-475 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 RICE LAKE WI
2001-07-18 715-207 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MARSHFIELD WI
2001-06-12 715-337 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 EAGLERIVER WI
2001-06-08 715-338 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 HUDSON WI
2001-06-08 715-350 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 ANTIGO WI
2001-06-08 715-368 1XXX2XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 SPENCER WI
2001-06-08 715-388 1XXX2XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 LCDFLAMBEU WI
2001-06-08 715-391 1XXX2XXX3XXX5XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 STRATFORD WI
2001-06-08 715-393 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
2001-06-08 715-396 1XXX3XXX8XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 OWEN WI
2001-06-05 715-461 6XXX7XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 EAU CLAIRE WI
2001-04-16 715-204 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 STEVENS PT WI
2001-04-09 715-203 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 WAUSAU WI
2001-04-03 715-852 7XXX which blocks → WISCONSIN BELL INC 9327 EAU CLAIRE WI
2001-04-01 715-606 not yet reported which blocks → AERIAL COMMUNICATIONS, INC. 6701 EAU CLAIRE WI
2001-03-23 715-529 8XXX which blocks → AERIAL COMMUNICATIONS, INC. 6701 EAU CLAIRE WI
2001-01-09 715-456 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EAU CLAIRE WI
2001-01-09 715-790 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RICE LAKE WI
— 715-200 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - WI 225C OSSEO WI
— 715-202 1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 CORNELL WI
— 715-205 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RICE LAKE WI
— 715-206 1XXX2XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 STANLEY WI
— 715-208 1XXX2XXX4XXX5XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 HURLEY WI
— 715-209 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 BAYFIELD WI
— 715-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 715-212 0XXX5XXX7XXX8XXX which blocks → METROPCS, INC. 5562 WAUSAU WI
— 715-213 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 WISCOSNRPD WI
— 715-214 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WISCONSIN BELL INC 9327 EAU CLAIRE WI
— 715-215 2XXX which blocks → AERIAL COMMUNICATIONS, INC. 6701 EAU CLAIRE WI
— 715-216 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 ANTIGO WI
— 715-217 2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PEMBINE WI
— 715-218 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MERRILL WI
— 715-221 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 MARSHFIELD WI
— 715-223 5XXX7XXX9XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 COLBY WI
— 715-224 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 TOMAHAWK WI
— 715-225 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 EAU CLAIRE WI
— 715-228 not yet reported which blocks → UNION TEL. CO. 0962 COLOMA WI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.