NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

354 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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, last 30 days
8X8, INC. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 20
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
— 715-251 6XXX which blocks → NIAGARA TEL. CO. 0920 NIAGARA WI
— 715-252 0XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 STEVENS PT WI
— 715-253 none assigned yet which blocks → WITTENBERG TEL. CO. 0973 WITTENBERG WI
— 715-254 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J STEVENS PT WI
— 715-255 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 LOYAL WI
— 715-256 7XXX8XXX which blocks → WISCONSIN BELL INC 9327 WAUPACA WI
— 715-257 0XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 ATHENS WI
— 715-258 not yet reported which blocks → WISCONSIN BELL INC 9327 WAUPACA WI
— 715-259 none assigned yet which blocks → BRIGHTSPEED OF NORTHWEST WISCONSIN, LLC 0950 WEBB LAKE WI
— 715-261 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
— 715-262 2XXX6XXX · 2 holders which blocks → TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK 1155 PRESCOTT WI
— 715-263 7XXX which blocks → CLEAR LAKE TEL. CO., INC. 0865 CLEAR LAKE WI
— 715-264 0XXX1XXX5XXX7XXX · 3 holders which blocks → TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK 1155 GLIDDEN WI
— 715-265 2XXX3XXX5XXX8XXX which blocks → TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK 1155 GLENWOODCY WI
— 715-266 6XXX which blocks → TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK 1155 WINTER WI
— 715-267 0XXX2XXX8XXX · 3 holders which blocks → BADGER TELECOM, INC. 0844 GREENWOOD WI
— 715-268 not yet reported which blocks → AMERY TELECOM, INC. 0842 AMERY WI
— 715-269 not yet reported which blocks → AMERY TELECOM, INC. 0842 DEER PARK WI
— 715-270 not yet reported which blocks → METRO SOUTHWEST PCS, LLP 9759 WAUPACA WI
— 715-272 0XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRONTIER COMMUNICATIONS OF WISCONSIN LLC 0870 SUGAR CAMP WI
— 715-273 7XXX8XXX9XXX · 2 holders which blocks → WISCONSIN BELL INC 9327 ELLSWORTH WI
— 715-274 1XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK 1155 MELLEN WI
— 715-275 0XXX1XXX2XXX6XXX7XXX8XXX · 6 holders which blocks → FRONTIER COMMUNICATIONS OF WISCONSIN LLC 0870 ELCHO WI
— 715-276 0XXX5XXX8XXX · 3 holders which blocks → TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK 1155 LAKEWOOD WI
— 715-277 6XXX7XXX8XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF WISCONSIN LLC 0870 LKTOMAHAWK WI
— 715-278 none assigned yet which blocks → CHEQUAMEGON COMMUNICATIONS COOPERATIVE, INC. 0860 MARENGO WI
— 715-279 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DURAND WI
— 715-281 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 WAUPACA WI
— 715-282 0XXX1XXX2XXX3XXX4XXX8XXX · 6 holders which blocks → FRONTIER COMMUNICATIONS OF WISCONSIN LLC 0870 CRESCENTLK WI
— 715-283 none assigned yet which blocks → WEST WISCONSIN TELCOM COOP., INC. 0971 EAU GALLE WI
— 715-284 none assigned yet which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 BLCKRIVFLS WI
— 715-285 none assigned yet which blocks → NELSON COMMUNICATIONS COOPERATIVE 0918 ARKANSAW WI
— 715-286 0XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 AUGUSTA WI
— 715-287 not yet reported which blocks → TRI-COUNTY TEL. COOP., INC. 0960 ELEVA WI
— 715-288 1XXX2XXX7XXX8XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF NORTHERN WISCONSIN, LLC 0956 EAGLEPOINT WI
— 715-289 0XXX1XXX2XXX6XXX7XXX8XXX · 3 holders which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 CADOTT WI
— 715-290 1XXX3XXX7XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SHELDON WI
— 715-292 5XXX6XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ASHLAND WI
— 715-294 0XXX8XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF NORTHWEST WISCONSIN, LLC 0950 OSCEOLA WI
— 715-295 4XXX6XXX · 2 holders which blocks → WISCONSIN BELL INC 9327 STEVENS PT WI
— 715-296 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RICE LAKE WI
— 715-297 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAUSAU WI
— 715-298 0–9 XXXwhole prefix which blocks → CHARTER IP ENABLED SERVICES, LLC 792K WAUSAU WI
— 715-299 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 BLCKRIVFLS WI
— 715-305 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 MARSHFIELD WI
— 715-306 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 STANLEY WI
— 715-307 3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 RIVERFALLS WI
— 715-308 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MENOMONIE WI
— 715-310 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STEVENS PT WI
— 715-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.