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 928
FRACTEL, LLC 18
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2021-11-22 928-400 0XXX4XXX · 2 holders which blocks → FRACTEL, LLC 965H WIKIEUP AZ
2021-11-09 928-933 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H PINETOP AZ
2021-10-25 928-732 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H LKHAVASUCY AZ
2020-10-02 928-644 4XXX6XXX · 2 holders which blocks → FRACTEL, LLC 965H COLORADOCY AZ
2020-10-02 928-744 4XXX6XXX7XXX · 3 holders which blocks → FRACTEL, LLC 965H ALPINE AZ
2020-10-02 928-822 2XXX4XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H FREDONIA AZ
2020-10-02 928-844 4XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H LITTLEFLD AZ
2020-10-02 928-866 2XXX6XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H MESQUITCRK AZ
2020-10-02 928-944 4XXX9XXX · 2 holders which blocks → FRACTEL, LLC 965H AZ VILLAGE AZ
2020-10-02 928-946 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H SAFFORD AZ
2020-10-02 928-966 3XXX6XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H SAN CARLOS AZ
2020-09-24 928-465 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H BULLHDCYN AZ
2020-06-02 928-544 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H CASTLEROCK AZ
2020-06-02 928-842 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H PARKER AZ
2020-06-02 928-877 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H PARKER DAM AZ
2020-06-02 928-977 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H YUMA AZ
2019-09-13 928-356 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H PRESCOTT AZ
2019-01-25 928-666 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H FLAGSTAFF AZ

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.