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
TC SYSTEMS, INC. - NY 41
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
2012-08-23 315-801 0–9 XXXall 10 · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 UTICA NY
— 315-215 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 ALEXNDRIBY NY
— 315-219 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 HERKIMER NY
— 315-221 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 WATERTOWN NY
— 315-226 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → TC SYSTEMS, INC. - NY 7140 NEWARK NY
— 315-227 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 PENN YAN NY
— 315-228 0XXX1XXX2XXX3XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 HAMILTON NY
— 315-229 1XXX2XXX3XXX4XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 CANTON NY
— 315-230 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → TC SYSTEMS, INC. - NY 7140 GENEVA NY
— 315-231 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 ONEIDA NY
— 315-233 6XXX which blocks → TC SYSTEMS, INC. - NY 7140 SYRACUSE NY
— 315-235 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 UTICA NY
— 315-236 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 OSWEGO NY
— 315-237 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 AUBURN NY
— 315-238 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 TULLY NY
— 315-239 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 SENECA FLS NY
— 315-261 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 POTSDAM NY
— 315-296 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 MASSENA NY
— 315-309 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 STAR LAKE NY
— 315-350 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 SYRACUSE NY
— 315-351 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 UTICA NY
— 315-352 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 BALDWINSVL NY
— 315-371 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 ROME NY
— 315-381 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 CLINTON NY
— 315-385 1XXX7XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 SYRACUSE NY
— 315-508 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 LITTLE FLS NY
— 315-535 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 GOUVERNEUR NY
— 315-537 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 HARRISVL NY
— 315-541 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 OGDENSBURG NY
— 315-545 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 CAMILLUS NY
— 315-554 0–9 XXXall 10 · 7 holders which blocks → TC SYSTEMS, INC. - NY 7140 SKANEATLES NY
— 315-563 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 POPLAR RDG NY
— 315-657 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → TC SYSTEMS, INC. - NY 7140 LIVERPOOL NY
— 315-772 not yet reported which blocks → TC SYSTEMS, INC. - NY 7140 WATERTOWN NY
— 315-774 not yet reported which blocks → TC SYSTEMS, INC. - NY 7140 WATERTOWN NY
— 315-835 0XXX1XXX2XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 WATERLOO NY
— 315-847 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 PALMYRA NY
— 315-902 0–9 XXXall 10 · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 CLYDE NY
— 315-903 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 MACEDON NY
— 315-904 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 WILLIAMSON NY
— 315-905 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 WOLCOTT 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.