NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 515-735 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 AMES IA
— 515-738 0XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 GRAND JCT IA
— 515-758 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9631 EARLHAM IA
— 515-761 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-769 not yet reported which blocks → HUXLEY COMMUNICATIONS COOPERATIVE 1205 KELLEY IA
— 515-770 not yet reported which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-771 not yet reported which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-778 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-779 not yet reported which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-789 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 DEXTER IA
— 515-795 5XXX6XXX7XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 MADRID IA
— 515-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 515-817 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 AMES IA
— 515-824 0XXX2XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 RENWICK IA
— 515-825 7XXX8XXX which blocks → GOLDFIELD TEL. CO. 1188 GOLDFIELD IA
— 515-826 not yet reported which blocks → COOPERATIVE TEL. EXCH. 1303 STANHOPE IA
— 515-827 0XXX2XXX3XXX4XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 JEWELL IA
— 515-830 not yet reported which blocks → IOWA NETWORK SVCS INC DBA AUREON NTWK SVCS, INC. 8858 DES MOINES IA
— 515-832 0XXX which blocks → QWEST CORPORATION 9631 WEBSTER CY IA
— 515-833 0XXX4XXX5XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 REDFIELD IA
— 515-834 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 DE SOTO IA
— 515-835 3XXX4XXX5XXX6XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 WEBSTER CY IA
— 515-836 not yet reported which blocks → ELLSWORTH COOP. TEL. ASSN. 1157 ELLSWORTH IA
— 515-838 not yet reported which blocks → STRATFORD MUTUAL TEL. CO. 1305 STRATFORD IA
— 515-839 not yet reported which blocks → WOOLSTOCK MUTUAL TEL. ASSN. 1342 WOOLSTOCK IA
— 515-846 not yet reported which blocks → WEBSTER-CALHOUN COOP. TEL. ASSN. 1328 BOXHOLM IA
— 515-848 4XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-851 3XXX4XXX6XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CLARION IA
— 515-852 0XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 DOWS IA
— 515-854 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 WILLIAMS IA
— 515-855 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 BUCKEYE IA
— 515-859 2XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 ALDEN IA
— 515-865 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-867 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
— 515-879 not yet reported which blocks → WEBSTER-CALHOUN COOP. TEL. ASSN. 1328 LANYON IA
— 515-882 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 LUVERNE IA
— 515-883 0XXX which blocks → QWEST CORPORATION 9631 DES MOINES IA
— 515-884 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 WHITTEMORE IA
— 515-885 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 BANCROFT IA
— 515-886 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 LAKOTA IA
— 515-887 not yet reported which blocks → NORTHWEST TEL. COOP. ASSN. 1261 WEST BEND IA
— 515-888 0XXX1XXX2XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 BOONE IA
— 515-889 not yet reported which blocks → FENTON COOP. TEL. CO. 1179 FENTON IA
— 515-890 3XXX4XXX5XXX6XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 HUMBOLDT IA
— 515-893 not yet reported which blocks → ELLSWORTH COOP. TEL. ASSN. 1157 GARDENCITY IA
— 515-899 1XXX which blocks → RADCLIFFE TEL. CO., INC. 1277 RADCLIFFE IA
— 515-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 515-924 none assigned yet which blocks → TITONKA TEL. CO. DBA TITONKA-BURT COMMUNICATIONS 1310 BURT IA
— 515-925 not yet reported which blocks → LONE ROCK COOP. TEL. CO. 1228 LONE ROCK IA
— 515-928 7XXX which blocks → TITONKA TEL. CO. DBA TITONKA-BURT COMMUNICATIONS 1310 TITONKA IA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.