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 201
MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 15
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
2001-06-13 201-972 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 RIDGEWOOD NJ
2001-05-18 201-676 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 LEONIA NJ
2001-04-20 201-783 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 RAMSEY NJ
2001-03-14 201-699 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 CLIFFSIDE NJ
2001-02-27 201-578 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 TEANECK NJ
2001-02-27 201-726 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 KEARNY NJ
2001-02-27 201-835 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 FAIR LAWN NJ
2001-02-26 201-355 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 RUTHERFORD NJ
2001-02-20 201-627 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 ENGLEWOOD NJ
2001-02-06 201-365 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 HASBROKHTS NJ
— 201-472 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 UNION CITY NJ
— 201-484 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 JERSEYCITY NJ
— 201-562 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 HACKENSACK NJ
— 201-688 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 BAYONNE NJ
— 201-834 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 ORADELL NJ

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.