NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 223
FRACTEL, LLC 24
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
2021-10-25 223-667 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H COLUMBIA PA
2021-08-03 223-386 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CHAMBERSBG PA
2021-02-26 223-377 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRACTEL, LLC 965H WARFORDSBG PA
2021-02-26 223-388 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H BIGLERVL PA
2021-02-26 223-399 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H EASTBERLIN PA
2020-05-27 223-336 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H CARLISLE PA
2020-05-27 223-348 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H DOVER PA
2020-05-27 223-465 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H GREENCASTL PA
2020-05-27 223-529 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H LANCASTER PA
2020-05-27 223-677 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H REEDSVILLE PA
2020-05-27 223-732 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H PALMYRA PA
2020-05-27 223-758 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRACTEL, LLC 965H MECHANCSBG PA
2020-05-27 223-786 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H STEWARTSTN PA
2020-05-27 223-842 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H NEWVILLE PA
2020-05-27 223-877 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H YORK PA
2020-05-27 223-946 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H MYERSTOWN PA
2020-05-27 223-977 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H PORT ROYAL PA
2020-05-20 223-300 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H BROGUE PA
2020-05-20 223-345 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CHAMBERSBG PA
2020-05-20 223-356 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H INTERCOURS PA
2020-05-20 223-500 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H JEFFERSON PA
2020-05-20 223-600 0XXX1XXX4XXX5XXX6XXX · 3 holders which blocks → FRACTEL, LLC 965H LIVERPOOL PA
2020-05-20 223-766 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H MERCERSBG PA
2019-01-28 223-666 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H HARISBGZN1 PA

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.