NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

337 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 25
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 12
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
Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 309-820 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-821 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-822 1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → ILLINOIS BELL TEL CO 9329 SPRING BAY IL
— 309-823 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-824 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 BLOOMINGTN IL
— 309-825 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BLOOMINGTN IL
— 309-826 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BLOOMINGTN IL
— 309-827 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-828 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-829 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-830 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 BLOOMINGTN IL
— 309-833 9XXX which blocks → FRONTIER NORTH, INC. - IL 1015 MACOMB IL
— 309-836 0XXX which blocks → FRONTIER NORTH, INC. - IL 1015 MACOMB IL
— 309-837 8XXX which blocks → FRONTIER NORTH, INC. - IL 1015 MACOMB IL
— 309-838 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 BLOOMINGTN IL
— 309-846 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 BLOOMINGTN IL
— 309-852 none assigned yet which blocks → FRONTIER NORTH, INC. - IL 1015 KEWANEE IL
— 309-853 none assigned yet which blocks → FRONTIER NORTH, INC. - IL 1015 KEWANEE IL
— 309-854 8XXX which blocks → FRONTIER NORTH, INC. - IL 1015 KEWANEE IL
— 309-856 0XXX1XXX which blocks → FRONTIER NORTH, INC. - IL 1015 KEWANEE IL
— 309-862 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-865 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H EASTMOLINE IL
— 309-867 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 OQUAWKA IL
— 309-872 6XXX7XXX · 2 holders which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 RIO IL
— 309-873 3XXX4XXX5XXX · 3 holders which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 GULFPORT IL
— 309-874 4XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MCLEAN IL
— 309-875 not yet reported which blocks → MID CENTURY TEL. COOP., INC. 1054 MAQUON IL
— 309-876 not yet reported which blocks → MID CENTURY TEL. COOP., INC. 1054 GILSON IL
— 309-879 not yet reported which blocks → MID CENTURY TEL. COOP., INC. 1054 VICTORIA IL
— 309-886 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 WASHINGTON IL
— 309-887 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ALBANY IL
— 309-888 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-895 3XXX which blocks → FRONTIER NORTH, INC. - IL 1015 BUDA IL
— 309-896 0XXX1XXX2XXX7XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ELMIRA IL
— 309-897 0XXX3XXX5XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 BRADFORD IL
— 309-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 309-921 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → ONVOY, LLC 224C ROANOKE IL
— 309-923 0XXX3XXX4XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ROANOKE IL
— 309-924 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 STRONGHST IL
— 309-925 0XXX1XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 TREMONT IL
— 309-926 not yet reported which blocks → MID CENTURY TEL. COOP., INC. 1054 MARIETTA IL
— 309-927 not yet reported which blocks → MID CENTURY TEL. COOP., INC. 1054 BISHOPHILL IL
— 309-928 0XXX1XXX4XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 FARMERCITY IL
— 309-932 0XXX1XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1036 GALVA IL
— 309-934 5XXX which blocks → HENRY COUNTY TEL. CO. 1029 ANNAWAN IL
— 309-935 not yet reported which blocks → HENRY COUNTY TEL. CO. 1029 ANNAWAN IL
— 309-936 not yet reported which blocks → HENRY COUNTY TEL. CO. 1029 ATKINSON IL
— 309-937 not yet reported which blocks → CAMBRIDGE TEL. CO. 0983 CAMBRIDGE IL
— 309-939 2XXX3XXX4XXX8XXX · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J ASTORIA IL
— 309-944 none assigned yet which blocks → GENESEO TEL. CO. 1016 GENESEO IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.