NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 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, last 30 days — NPA 309
ONVOY, LLC 1
AHOI LLC 1
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
— 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
— 309-945 none assigned yet which blocks → GENESEO TEL. CO. 1016 GENESEO IL
— 309-949 not yet reported which blocks → GENESEO TEL. CO. 1016 GREENRIVER IL
— 309-950 not yet reported which blocks → IL
— 309-955 0–9 XXXall 10 · 6 holders which blocks → TWILIO INTERNATIONAL, INC. 506J WATAGA IL
— 309-958 not yet reported which blocks → IL
— 309-959 not yet reported which blocks → IL
— 309-962 none assigned yet which blocks → FRONTIER NORTH, INC. - IL 1015 LE ROY IL
— 309-963 not yet reported which blocks → FRONTIER COMMUNICATIONS OF ILLINOIS, INC. 1038 DANVERS IL
— 309-965 0XXX3XXX4XXX6XXX9XXX · 5 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 GOODFIELD IL
— 309-968 8XXX which blocks → BRIGHTSPEED OF ILLINOIS, LLC 1057 MANITO IL
— 309-972 not yet reported which blocks → ONEIDA NETWORK SERVICES, INC. 4624 RIO IL
— 309-973 0XXX1XXX2XXX3XXX4XXX6XXX9XXX · 6 holders which blocks → UNITED STATES CELLULAR - IL 6265 GALESBURG IL
— 309-975 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC 224C AVON IL
— 309-976 not yet reported which blocks → IL
— 309-977 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F GREEN VLY IL
— 309-988 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 8 holders which blocks → ONVOY, LLC 224C LACON IL
— 309-989 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
— 309-994 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BLOOMINGTN IL
— 309-995 not yet reported which blocks → MID CENTURY TEL. COOP., INC. 1054 LA FAYETTE IL
— 309-999 7XXX which blocks → ILLINOIS BELL TEL CO 9329 PEORIA IL

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.