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 518
TC SYSTEMS, INC. - NY 35
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
2017-03-01 518-912 0–9 XXXall 10 · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 ALBANY NY
2010-09-16 518-318 0–9 XXXall 10 · 7 holders which blocks → TC SYSTEMS, INC. - NY 7140 CAIRO NY
2001-04-11 518-539 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → TC SYSTEMS, INC. - NY 7140 MECHANICVL NY
2001-04-11 518-714 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 BALLSTNSPA NY
— 518-203 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 TROY NY
— 518-217 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 ELIZABTHTN NY
— 518-223 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 GLENSFALLS NY
— 518-240 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 BOLTON LDG NY
— 518-241 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 LAKEPLACID NY
— 518-242 0XXX6XXX7XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 ALBANY NY
— 518-243 0XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 SCHENCTADY NY
— 518-244 0XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 TROY NY
— 518-245 0XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 SARATOGSPG NY
— 518-246 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 AMSTERDAM NY
— 518-247 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 PLATTSBG NY
— 518-252 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 CAMBRIDGE NY
— 518-255 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 COBLESKILL NY
— 518-267 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. - NY 7140 HUDSON NY
— 518-268 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 TROY NY
— 518-292 8XXX which blocks → TC SYSTEMS, INC. - NY 7140 ALBANY NY
— 518-301 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 ALBANY NY
— 518-304 0–9 XXXall 10 · 8 holders which blocks → TC SYSTEMS, INC. - NY 7140 SARANAC LK NY
— 518-320 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 ALBANY NY
— 518-322 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 ALBANY NY
— 518-336 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 CASTLETON NY
— 518-337 0XXX1XXX3XXX6XXX7XXX8XXX9XXX which blocks → TC SYSTEMS, INC. - NY 7140 ALBANY NY
— 518-351 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. - NY 7140 SCHROON LK NY
— 518-389 1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 COLONIE NY
— 518-503 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. - NY 7140 TICONDROGA NY
— 518-521 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 MALONE NY
— 518-531 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 7 holders which blocks → TC SYSTEMS, INC. - NY 7140 GREENWICH NY
— 518-612 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 SCHENCTADY NY
— 518-625 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 CATSKILL NY
— 518-628 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 HUNTER NY
— 518-635 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 SOBETHLEHM NY

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.