NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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, all time — NPA 603
PAETEC ITEL, LLC 58
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
2015-05-06 603-407 0XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J BELMONT NH
2012-02-28 603-251 0XXX1XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J CHARLESTN NH
2003-06-26 603-593 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J JAFFREY NH
2001-09-24 603-509 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J ROCHESTER NH
2001-04-26 603-295 not yet reported which blocks → PAETEC ITEL, LLC 829J DURHAM NH
2001-04-26 603-862 not yet reported which blocks → PAETEC ITEL, LLC 829J DURHAM NH
— 603-206 0XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J MANCHESTER NH
— 603-218 3XXX4XXX7XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J MANCHESTER NH
— 603-238 0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J PLYMOUTH NH
— 603-283 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J KEENE NH
— 603-296 3XXX5XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J MANCHESTER NH
— 603-310 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J BEDFORD NH
— 603-314 3XXX8XXX which blocks → PAETEC ITEL, LLC 829J MANCHESTER NH
— 603-319 1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J PORTSMOUTH NH
— 603-327 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J SALEM NH
— 603-328 0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J SALEM NH
— 603-371 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J PETERBROGH NH
— 603-373 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J PORTSMOUTH NH
— 603-386 1XXX4XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J SALEM NH
— 603-389 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J DURHAM NH
— 603-410 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J CONCORD NH
— 603-413 1XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J MANCHESTER NH
— 603-418 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J EXETER NH
— 603-439 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J KEENE NH
— 603-459 3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NASHUA NH
— 603-501 0XXX1XXX2XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J PORTSMOUTH NH
— 603-535 not yet reported which blocks → PAETEC ITEL, LLC 829J PLYMOUTH NH
— 603-545 1XXX2XXX4XXX5XXX7XXX8XXX9XXX which blocks → PAETEC ITEL, LLC 829J CONCORD NH
— 603-546 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J NASHUA NH
— 603-581 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J LACONIA NH
— 603-589 5XXX7XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J NASHUA NH
— 603-601 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J HAMPTON NH
— 603-610 3XXX4XXX5XXX7XXX8XXX which blocks → PAETEC ITEL, LLC 829J PORTSMOUTH NH
— 603-612 0XXX1XXX4XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J PLAISTOW NH
— 603-617 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J DOVER NH
— 603-657 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J MANCHESTER NH
— 603-670 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J MERRIMACK NH
— 603-681 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J SALEM NH
— 603-685 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J SALEM NH
— 603-689 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NASHUA NH
— 603-693 0XXX2XXX5XXX7XXX8XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J EPPING NH
— 603-706 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J RAYMOND NH
— 603-717 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J CONCORD NH
— 603-724 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX which blocks → PAETEC ITEL, LLC 829J CONCORD NH
— 603-727 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J LEBANON NH
— 603-757 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J KEENE NH
— 603-758 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J HAMPTON NH
— 603-821 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J NASHUA NH
— 603-822 1XXX2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J ROCHESTER NH
— 603-832 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J LACONIA NH

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.