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 419
QUALSTAR COMMUNICATIONS, INC. - OH 29
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
2004-08-17 419-567 0–9 XXXall 10 · 9 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 PAULDING OH
2001-08-22 419-916 not yet reported which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 NAPOLEON OH
2001-08-22 419-918 8XXX which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 FLORIDA OH
2001-08-21 419-219 4XXX7XXX9XXX · 2 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 JEWELL OH
2001-08-21 419-220 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 ARCHBOLD OH
2001-08-21 419-390 4XXX6XXX7XXX · 3 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 LYONS OH
2001-08-21 419-401 5XXX6XXX7XXX9XXX · 4 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 METAMORA OH
2001-08-21 419-402 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 SWANTON OH
2001-08-21 419-404 4XXX7XXX8XXX9XXX · 3 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 WAUSEON OH
2001-08-21 419-430 4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 DESHLER OH
2001-08-21 419-431 not yet reported which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 GERALD OH
2001-08-21 419-437 not yet reported which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 GRELTNMLNT OH
2001-08-21 419-489 not yet reported which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 STRYKER OH
2001-08-21 419-493 not yet reported which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 OLD FORT OH
2001-08-21 419-498 not yet reported which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 WOODVILLE OH
2001-08-21 419-505 4XXX5XXX · 2 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 RISINGSUN OH
2001-08-21 419-507 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 GREEN SPG OH
2001-08-21 419-510 6XXX which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 WATERVILLE OH
2001-08-21 419-570 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 RCFLDCTBRY OH
2001-08-21 419-608 5XXX7XXX8XXX9XXX · 4 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 HOLGATE OH
2001-08-21 419-613 4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 LIBERTYCTR OH
2001-08-21 419-713 none assigned yet which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 HAMLER OH
2001-08-21 419-714 5XXX7XXX8XXX9XXX · 4 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 STONYRIDGE OH
2001-08-21 419-716 5XXX7XXX · 2 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 BLOOMDALE OH
2001-08-21 419-760 4XXX6XXX7XXX8XXX · 4 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 PORTAGE OH
2001-08-21 419-761 4XXX7XXX9XXX · 3 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 MOLINE OH
2001-08-21 419-801 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 LUCKEY OH
2001-08-21 419-808 9XXX which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 CYGNET OH
2001-08-20 419-990 not yet reported which blocks → QUALSTAR COMMUNICATIONS, INC. - OH 2094 DEFIANCE OH

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.