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
2021-03-18 779-278 0XXX1XXX2XXX4XXX7XXX8XXX · 5 holders which blocks → STRATUS NETWORKS 495J GRANDRIDGE IL
2021-03-18 779-710 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC 224C ROCKFORD IL
2021-03-18 779-910 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C DE KALB IL
2021-02-10 779-336 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H WOODSTOCK IL
2021-02-10 779-732 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H LA SALLE IL
2021-01-28 779-788 0XXX1XXX2XXX7XXX8XXX · 4 holders which blocks → FRACTEL, LLC 965H PECATONICA IL
2021-01-12 779-678 0XXX1XXX8XXX9XXX · 2 holders which blocks → FRACTEL, LLC 965H ROCKFORD IL
2021-01-08 779-399 0XXX3XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H KINSMAN IL
2020-12-10 779-326 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → STRATUS NETWORKS 495J DWIGHT IL
2020-11-25 779-325 1XXX3XXX5XXX · 3 holders which blocks → STRATUS NETWORKS 495J FRANKLIGRV IL
2020-11-04 779-334 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DE KALB IL
2020-09-30 779-323 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J ROCKFORD IL
2020-09-18 779-346 0XXX1XXX2XXX3XXX · 4 holders which blocks → FRACTEL, LLC 965H CAPRON IL
2020-09-18 779-722 0XXX2XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → FRACTEL, LLC 965H ASHTON IL
2020-09-17 779-299 0XXX1XXX2XXX · 3 holders which blocks → STRATUS NETWORKS 495J WENONA IL
2020-09-17 779-304 1XXX3XXX · 2 holders which blocks → STRATUS NETWORKS 495J RUTLAND IL
2020-09-17 779-305 1XXX3XXX5XXX7XXX · 3 holders which blocks → STRATUS NETWORKS 495J REDDICK IL
2020-09-17 779-306 0–9 XXXall 10 · 6 holders which blocks → STRATUS NETWORKS 495J PONTIAC IL
2020-09-17 779-307 0XXX1XXX2XXX3XXX4XXX · 4 holders which blocks → STRATUS NETWORKS 495J LOSTANT IL
2020-09-17 779-308 0XXX1XXX3XXX · 3 holders which blocks → STRATUS NETWORKS 495J CHATSWORTH IL
2020-09-17 779-310 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → STRATUS NETWORKS 495J NEWMILFORD IL
2020-09-17 779-313 1XXX3XXX8XXX · 3 holders which blocks → STRATUS NETWORKS 495J CHERRY VLY IL
2020-09-17 779-314 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → STRATUS NETWORKS 495J ROCK CUT IL
2020-09-17 779-315 0–9 XXXall 10 · 4 holders which blocks → STRATUS NETWORKS 495J ROSCOE IL
2020-09-17 779-316 0XXX1XXX3XXX6XXX8XXX · 4 holders which blocks → STRATUS NETWORKS 495J CRESTON IL
2020-09-17 779-317 1XXX2XXX3XXX8XXX · 3 holders which blocks → STRATUS NETWORKS 495J KIRKLAND IL
2020-09-17 779-318 1XXX3XXX7XXX · 3 holders which blocks → STRATUS NETWORKS 495J MALTA IL
2020-09-17 779-319 0XXX1XXX2XXX3XXX · 4 holders which blocks → STRATUS NETWORKS 495J MAPLE PARK IL
2020-09-17 779-320 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → STRATUS NETWORKS 495J MONROE CTR IL
2020-09-17 779-321 0XXX1XXX2XXX3XXX4XXX · 3 holders which blocks → STRATUS NETWORKS 495J SHABBONA IL
2020-09-17 779-322 1XXX2XXX3XXX · 3 holders which blocks → STRATUS NETWORKS 495J THOMAS IL
2020-09-15 779-297 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → IP HORIZON LLC 515J STERLING IL
2020-09-15 779-298 0XXX1XXX2XXX8XXX · 4 holders which blocks → IP HORIZON LLC 515J FORREST IL
2020-09-08 779-296 1XXX2XXX · 2 holders which blocks → STRATUS NETWORKS 495J LONG POINT IL
2020-09-04 779-291 0XXX1XXX3XXX4XXX5XXX · 4 holders which blocks → STRATUS NETWORKS 495J WONDERLAKE IL
2020-09-04 779-292 0XXX1XXX3XXX4XXX5XXX · 3 holders which blocks → STRATUS NETWORKS 495J ONARGA IL
2020-09-04 779-293 0–9 XXXall 10 · 5 holders which blocks → STRATUS NETWORKS 495J NEW LENOX IL
2020-09-04 779-294 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → STRATUS NETWORKS 495J HARDING IL
2020-09-04 779-295 0XXX1XXX2XXX3XXX · 3 holders which blocks → STRATUS NETWORKS 495J MAZON IL
2020-09-02 779-290 0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 5 holders which blocks → STRATUS NETWORKS 495J MILFORD IL
2020-09-01 779-289 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NUSO, LLC 478J SO BELOIT IL
2020-08-25 779-280 0XXX1XXX2XXX3XXX4XXX8XXX · 4 holders which blocks → STRATUS NETWORKS 495J DONOVAN IL
2020-08-25 779-282 0XXX1XXX2XXX3XXX4XXX7XXX8XXX · 4 holders which blocks → STRATUS NETWORKS 495J MARTINTON IL
2020-08-25 779-283 0XXX1XXX2XXX3XXX4XXX · 3 holders which blocks → STRATUS NETWORKS 495J RICHMOND IL
2020-08-25 779-284 0XXX1XXX8XXX · 3 holders which blocks → STRATUS NETWORKS 495J SHELDON IL
2020-08-25 779-285 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 6 holders which blocks → STRATUS NETWORKS 495J SHERIDAN IL
2020-08-25 779-286 0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 5 holders which blocks → STRATUS NETWORKS 495J SPRING GRV IL
2020-08-12 779-281 0XXX1XXX2XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → ONVOY, LLC 224C TOLUCA IL
2020-08-12 779-991 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC 224C LELAND IL
2020-07-28 779-275 0–9 XXXall 10 · 5 holders which blocks → STRATUS NETWORKS 495J ROCKFORD 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.