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 315
VERIZON NEW YORK, INC. 216
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
2008-03-25 315-744 0–9 XXXall 10 · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 SYRACUSE NY
2004-03-23 315-791 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 ONTARIO NY
— 315-207 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → VERIZON NEW YORK, INC. 9104 OSWEGO NY
— 315-214 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 SYRACUSE NY
— 315-245 6XXX7XXX8XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 CAMDEN NY
— 315-251 0XXX4XXX5XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 SYRACUSE NY
— 315-252 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 AUBURN NY
— 315-253 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 AUBURN NY
— 315-255 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 AUBURN NY
— 315-258 1XXX5XXX6XXX7XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 AUBURN NY
— 315-262 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 POTSDAM NY
— 315-265 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 POTSDAM NY
— 315-266 1XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 UTICA NY
— 315-267 1XXX6XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 POTSDAM NY
— 315-268 8XXX which blocks → VERIZON NEW YORK, INC. 9104 POTSDAM NY
— 315-287 6XXX8XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 GOUVERNEUR NY
— 315-291 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 SKANEATLES NY
— 315-322 0XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 MADRID NY
— 315-330 0XXX1XXX6XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 ROME NY
— 315-331 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NEWARK NY
— 315-332 0XXX1XXX6XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 NEWARK NY
— 315-334 0XXX which blocks → VERIZON NEW YORK, INC. 9104 ROME NY
— 315-336 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ROME NY
— 315-337 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ROME NY
— 315-338 4XXX which blocks → VERIZON NEW YORK, INC. 9104 ROME NY
— 315-339 8XXX which blocks → VERIZON NEW YORK, INC. 9104 ROME NY
— 315-341 0XXX4XXX8XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 OSWEGO NY
— 315-342 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 OSWEGO NY
— 315-343 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 OSWEGO NY
— 315-344 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 8 holders which blocks → VERIZON NEW YORK, INC. 9104 HEUVELTON NY
— 315-349 9XXX which blocks → VERIZON NEW YORK, INC. 9104 OSWEGO NY
— 315-353 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 NORWOOD NY
— 315-361 0XXX3XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 ONEIDA NY
— 315-363 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ONEIDA NY
— 315-364 0XXX1XXX4XXX6XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 POPLAR RDG NY
— 315-366 0XXX1XXX4XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 ONEIDA NY
— 315-375 0XXX1XXX2XXX3XXX5XXX7XXX9XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 MORRISTOWN NY
— 315-379 5XXX6XXX8XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 CANTON NY
— 315-384 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 NORFOLK NY
— 315-386 0XXX5XXX6XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 CANTON NY
— 315-388 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → VERIZON NEW YORK, INC. 9104 WADDINGTON NY
— 315-393 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 OGDENSBURG NY
— 315-394 1XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 OGDENSBURG NY
— 315-413 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 SYRACUSE NY
— 315-414 1XXX2XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 SYRACUSE NY
— 315-421 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SYRACUSE NY
— 315-422 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SYRACUSE NY
— 315-423 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SYRACUSE NY
— 315-424 3XXX which blocks → VERIZON NEW YORK, INC. 9104 SYRACUSE NY
— 315-425 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SYRACUSE NY

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.