NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

3 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, last 30 days — NPA 779
8X8, INC. 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 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
2020-07-28 779-276 0–9 XXXall 10 · 4 holders which blocks → STRATUS NETWORKS 495J DE KALB IL
2020-07-27 779-345 0XXX1XXX2XXX3XXX5XXX6XXX · 5 holders which blocks → FRACTEL, LLC 965H BYRON IL
2020-07-27 779-677 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H FREEPORT IL
2020-07-27 779-799 0XXX1XXX2XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H COLETA IL
2020-07-27 779-922 0XXX1XXX2XXX4XXX5XXX · 5 holders which blocks → FRACTEL, LLC 965H HOOPPOLE IL
2020-07-27 779-933 0XXX1XXX2XXX3XXX7XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H HINCKLEY IL
2020-07-17 779-699 0XXX1XXX6XXX7XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H SO BELOIT IL
2020-07-14 779-356 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H CRYSTAL LK IL
2020-07-14 779-599 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → FRACTEL, LLC 965H PAW PAW IL
2020-07-14 779-766 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRACTEL, LLC 965H DEPUE IL
2020-07-14 779-877 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRACTEL, LLC 965H VERONA IL
2020-07-14 779-899 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H LISBON IL
2020-07-14 779-946 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → FRACTEL, LLC 965H GRANVILLE IL
2020-07-14 779-977 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H HARVARD IL
2020-06-26 779-274 0–9 XXXall 10 · 3 holders which blocks → CSC WIRELESS, LLC 425J ROCKFORD IL
2020-05-28 779-273 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → ONVOY, LLC 224C DANFORTH IL
2020-05-28 779-778 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → ONVOY, LLC 224C WINNEBAGO IL
2020-05-01 779-272 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E ROCKFORD IL
2020-04-29 779-271 1XXX2XXX · 2 holders which blocks → CSC WIRELESS, LLC 425J LANARK IL
2020-02-19 779-270 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DE KALB IL
2020-02-10 779-269 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ROCKFORD IL
2020-02-06 779-268 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 ST ANNE IL
2020-01-17 779-267 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JOLIET IL
2019-12-09 779-266 0XXX1XXX2XXX3XXX9XXX · 5 holders which blocks → TELNYX LLC 073H LANARK IL
2019-10-11 779-758 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H JOLIET IL
2019-10-10 779-465 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRACTEL, LLC 965H BRAIDWOOD IL
2019-10-08 779-265 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 MCHENRY IL
2019-10-07 779-264 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KANKAKEE IL
2019-09-17 779-900 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H FRANKFORT IL
2019-08-08 779-600 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H CISSNAPARK IL
2018-12-05 779-262 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC 224C OGLESBY IL
2018-11-30 779-261 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H FAIRBURY IL
2018-10-08 779-260 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JOLIET IL
2018-08-27 779-258 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC 224C HERSCHER IL
2018-08-27 779-259 0XXX1XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC 224C MANTENO IL
2018-07-11 779-257 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E WILMINGTON IL
2018-06-05 779-256 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D ROCKFORD IL
2018-02-27 779-250 0XXX1XXX2XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 STERLING IL
2018-02-22 779-249 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DWIGHT IL
2018-01-08 779-237 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 STREATOR IL
2018-01-02 779-263 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 PLAINFIELD IL
2017-12-01 779-247 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 WOODSTOCK IL
2017-10-23 779-246 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 ROCHELLE IL
2017-10-05 779-242 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JOLIET IL
2017-10-05 779-243 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FRANKFORT IL
2017-10-05 779-244 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MCHENRY IL
2017-10-03 779-666 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C ROCKFORD IL
2017-06-01 779-241 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 MORRIS IL
2017-04-04 779-238 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ROCKFORD IL
2016-11-16 779-915 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 WOODSTOCK IL

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.